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HP0-663 - NonStop Data Communication Basics - Dump Information

Vendor : HP
Exam Code : HP0-663
Exam Name : NonStop Data Communication Basics
Questions and Answers : 154 Q & A
Updated On : November 12, 2018
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HP0-663 Questions and Answers

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HP0-663 NonStop Data Communication Basics

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HP0-663 exam Dumps Source : NonStop Data Communication Basics

Test Code : HP0-663
Test Name : NonStop Data Communication Basics
Vendor Name : HP
Q&A : 154 Real Questions

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HP HP NonStop Data Communication

IR Prognosis for Infrastructure to assist HP Integrity NonStop X Platform | killexams.com Real Questions and Pass4sure dumps

SYDNEY--(company WIRE)--IR, the main international issuer of proactive efficiency administration utility for crucial IT infrastructure, funds and communications ecosystems, today introduced instant help for the HP Integrity NonStop X platform in its globally adopted true-time efficiency management answer, Prognosis for Infrastructure.

Prognosis has been the efficiency management answer of choice for many of the biggest corporations on earth because it became first launched in 1988. providing true-time management of fault-tolerant systems, Prognosis has been ensuring that business-vital computing device methods and purposes running on HP NonStop server architecture have operated reliably by using helping to identify patterns within the information so that issues can also be stopped in their tracks.

At this week’s HP discover 2014 event in Barcelona, HP introduced that it expects to liberate the x86 structure version of the one hundred percent fault-tolerant HP NonStop solution in March 2015. As an HP AllianceOne companion, IR has committed R&D substances to guide HP as it brings fault-tolerant HP NonStop options to the x86 structure, within the sort of the HP Integrity NonStop X. Prognosis for Infrastructure is available for deployment now on HP Integrity NonStop X, for beta shoppers and early adopters.

Prognosis provides a seamless transition from the common HP NonStop servers to the new x86 expertise, by way of featuring the identical precise-time visibility into the HP NonStop system, middleware, functions and network, including new Infiniband interconnect, even with the underlying architecture. using Prognosis that you can establish tendencies in true time and take motion as well as see a complete technology ambiance from one aspect of view. benefits encompass predicting potential overloads earlier than the cracks birth to reveal.

Prognosis alerts IT teams when equipment, consumer, utility and system hundreds are coming near thresholds. They gained’t ought to look for knock on effects, because Prognosis immediately gives them this counsel and takes IT group of workers at once to the appropriate dashboard in order that the issue will also be visualized and a repair put in area straight away. Even superior, Prognosis can amplify the difficulty if the recipients of the alert notifications do not reply. This capacity that warnings aren't unnoticed, however are acted upon as quickly as feasible. Prognosis may also take corrective action to rectify the problem, notify the IT crew and document on the effect.

“In today’s global marketplace, being reactive isn’t going to retain your systems running,” pointed out Darc Rasmussen Managing Director and Chief government Officer. “You also need to have the operational perception to be proactive. As consumers take capabilities of the continued scalability, performance, and safety of the NonStop platform, Prognosis will make sure that service ranges continue to be met. by giving you the records, metrics and insight your corporation must make certain that your systems are running efficaciously, Prognosis permits you to make proactive operational and company decisions without problems, and is designed to grow with no trouble together with your company.”

About IR

IR is the company manufacturer identify of built-in analysis confined (ASX:IRI), the main global company of proactive performance management utility for crucial IT infrastructure, funds and communications ecosystems. more than one thousand organizations in over 60 countries—together with one of the vital world’s biggest banks, airlines and telecommunication companies count on IR Prognosis to supply enterprise crucial insights and make sure continuity-critical programs bring high availability and performance for hundreds of thousands of their valued clientele across the globe. For extra information on IR, visit www.ir.com.


HP security Voltage's SecureData commercial enterprise: Product overview | killexams.com Real Questions and Pass4sure dumps

HP received Voltage protection in April 2015, rebranding the platform as "HP security Voltage." The product is an information encryption and key generation solution that includes tokenization for safeguarding sensitive company data. The HP safety Voltage platform comprises loads of products, similar to HP SecureData commercial enterprise, HP SecureData Hadoop, HP SecureData funds and so on. this article focuses on HP SecureData business, which includes HP layout-holding Encryption (FPE), HP comfy Stateless Tokenization (SST) expertise, HP Stateless Key management, and records protecting.

Product facets

HP SecureData business is a scalable product that encrypts both structured and unstructured statistics, tokenizes facts to avoid viewing through unauthorized clients, meets PCI DSS compliance requirements, and gives analytics.

The middle of HP SecureData commercial enterprise is the Voltage SecureData administration Console, which provides centralized coverage management and reporting for all Voltage SecureData methods. one more component, the Voltage Key management Server, manages the encryption keys. policy-controlled application programming interfaces enable native encryption and tokenization on numerous platforms, from security tips and adventure managers to Hadoop to cloud environments.

The platform employs a special procedure known as HP Stateless Key management, which ability keys are generated on demand, in response to policy stipulations, after users are authenticated and licensed. Keys may also be regenerated as needed. using stateless key administration reduces administrative overhead and costs by way of eliminating the important thing keep -- there isn't any should save, keep song of and lower back up every key it's been issued. Plus, an administrator can hyperlink HP Stateless Key administration to a firm's identification management equipment to implement function-primarily based entry to data at the box level.

FPE is in line with superior Encryption normal. FPE encrypts statistics without altering the database schema, however does make minimal changes to purposes that should view cleartext facts. (in lots of cases, most effective a single line of code is modified.)

HP SecureData business's key management, reporting and logging approaches aid customers meet compliance with PCI DSS, health insurance Portability and Accountability Act and Gramm-Leach-Bliley Act, in addition to state, country wide and European facts privateness regulations.

HP SecureData business is appropriate with just about any type of database, including Oracle, DB2, MySQL, Sybase, Microsoft SQL and Microsoft Azure SQL, among others. It helps a wide variety of operating techniques and platforms, together with windows, Linux, AIX, Solaris, HP-UX, HP NonStop, Stratus VOS, IBM z/OS, Amazon internet functions, Microsoft Azure, Teradata, Hadoop and many cloud environments.

groups that enforce HP SecureData business can expect to have full conclusion-to-conclusion records insurance plan in 60 days or less.

Pricing and licensing

potential purchasers ought to contact an HP revenue consultant for pricing and licensing counsel.

guide

HP offers ordinary and top class assist for all HP safety Voltage items. commonplace support includes access to the options portal and on-line support requests, the on-line knowledge base, email guide, business hours telephone help, 4-hour response time and a support desk equipment.

premium guide contains the equal aspects as common assist, but with 24x7 mobile aid and a two-hour response time.


international house Station supercomputer gets an extended dwell | killexams.com Real Questions and Pass4sure dumps

Why it matters: There are nevertheless more unknowns about operating computer systems in area to be answered. HP business's Spaceborne laptop on the ISS should be used by way of crew individuals for several months earlier than it's hauled lower back all the way down to Earth for analysis.

once in a while engineering a completely new answer is not the best route of motion. Engineers at NASA and HP commercial enterprise definitely believed this mantra when launching the Spaceborne computing device to the ISS in 2017.

In what quantities of an off-the-shelf server that has the compute vigor of around 30 laptops, the Spaceborne computer uses the same hardware discovered interior of records centers on the planet. software has been delivered to often verify for vigour fluctuations and to look for indications of improperly computed outcomes.

working on a Linux distribution, Spaceborne turns out a bit over one trillion calculations per second. bodily, the unit weighs in at 124 kilos however given its use in a 0 gravity environment, this infrequently concerns after it left the launchpad. it's currently installed to the ceiling of the ISS the usage of handiest a handful of bolts.

because of the failure of the Soyuz rocket remaining month, Spaceborne is getting an extended stay at the ISS. For crew participants aboard the ISS, this will present giant merits. Sending records from side to side from Earth can take a long time. Being capable of work in the neighborhood eliminates that bottleneck. looking against the longer term, natural wireless communication can take up to 24 minutes for a packet to reach Mars from Earth. an area-precious supercomputer could enormously cut back that point.

working in area has brought a couple of small variety of issues. For some yet to be determined rationale, strong state drives are failing at an continually excessive fee. Out of the 20 SSDs in the computer, nine of them failed upfront. Vibrations from the launch automobile, erratic radiation stages, or easily unstable power beginning are only a number of circumstances that SSDs aren't always subjected to.

At some point in the future (estimated April 2019), Spaceborne should be brought again all the way down to Earth for a full examination. A crew will get away a elaborate microscope to locate even the smallest bits of hurt brought about to the accessories that spent their life in house.

linked Reads

HP0-663 NonStop Data Communication Basics

Study Guide Prepared by Killexams.com HP Dumps Experts


Killexams.com HP0-663 Dumps and Real Questions

100% Real Questions - Exam Pass Guarantee with High Marks - Just Memorize the Answers



HP0-663 exam Dumps Source : NonStop Data Communication Basics

Test Code : HP0-663
Test Name : NonStop Data Communication Basics
Vendor Name : HP
Q&A : 154 Real Questions

Take these HP0-663 questions and solutions earlier than you visit vacations for check prep.
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NonStop Data Communication Basics

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The CIA's communications suffered a catastrophic compromise. It started in Iran. | killexams.com real questions and Pass4sure dumps

In 2013, hundreds of CIA officers — many working nonstop for weeks — scrambled to contain a disaster of global proportions: a compromise of the agency’s internet-based covert communications system used to interact with its informants in dark corners around the world. Teams of CIA experts worked feverishly to take down and reconfigure the websites secretly used for these communications; others managed operations to quickly spirit assets to safety and oversaw other forms of triage.

“When this was going on, it was all that mattered,” said one former intelligence community official. The situation was “catastrophic,” said another former senior intelligence official.

From around 2009 to 2013, the U.S. intelligence community experienced crippling intelligence failures related to the secret internet-based communications system, a key means for remote messaging between CIA officers and their sources on the ground worldwide. The previously unreported global problem originated in Iran and spiderwebbed to other countries, and was left unrepaired — despite warnings about what was happening — until more than two dozen sources died in China in 2011 and 2012 as a result, according to 11 former intelligence and national security officials.

The disaster ensnared every corner of the national security bureaucracy — from multiple intelligence agencies, congressional intelligence committees and independent contractors to internal government watchdogs — forcing a slow-moving, complex government machine to grapple with the deadly dangers of emerging technologies.

In a world where dependence on advanced technology may be a necessary evil for modern espionage, particularly in hostile regions where American officials can’t operate freely, such technical failures are an ever present danger and will only become more acute with time.

“When these types of compromises happen, it’s so dark and bad,” said one former official. “They can burrow in. It never really ends.”

A former senior intelligence official with direct knowledge of the compromise said it had global implications for the CIA.  “You start thinking twice about people, from China to Russia to Iran to North Korea,” said the former official.  The CIA was worried about its network “totally unwinding worldwide.”

Yahoo News’ reporting on this global communications failure is based on conversations with eleven former U.S. intelligence and government officials directly familiar with the matter who requested anonymity to discuss sensitive operations. Multiple former intelligence officials said that the damage from the potential global compromise was serious — even catastrophic — and will persist for years.

More than just a question of a single failure, the fiasco illustrates a breakdown that was never properly addressed. The government’s inability to address the communication system’s insecurities until after sources were rolled up in China was disastrous. “We’re still dealing with the fallout,” said one former national security official. “Dozens of people around the world were killed because of this.”

One of the largest intelligence failures of the past decade started in Iran in 2009, when the Obama administration announced the discovery of a secret Iranian underground enrichment facility — part of Iran’s headlong drive for nuclear weapons. Angered about the breach, the Iranians went on a mole hunt, looking for foreign spies, said one former senior intelligence official.

The mole hunt wasn’t hard, in large part, because the communications system the CIA was using to communicate with agents was flawed. Former U.S. officials said the internet-based platform, which was first used in war zones in the Middle East, was not built to withstand the sophisticated counterintelligence efforts of a state actor like China or Iran. “It was never meant to be used long term for people to talk to sources,” said one former official. “The issue was that it was working well for too long, with too many people. But it was an elementary system.”

“Everyone was using it far beyond its intention,” said another former official.

The risks posed by the system appeared to have been overlooked in part because it was easy to use, said the former intelligence officials. There is no foolproof way to communicate — especially with expediency and urgency — with sources in hostile environments like Iran and China, noted the former officials. But a sense of confidence in the system kept it in operation far longer than was safe or advisable, said former officials. The CIA’s directorate of science and technology, which is responsible for the secure communications system, “says, ‘our s***’s impregnable,’ but it’s obviously not,” said one former official.

By 2010, however, it appears that Iran had begun to identify CIA agents. And by 2011,  Iranian authorities dismantled a CIA spy network in that country, said seven former U.S. intelligence officials. (Indeed, in May 2011, Iranian intelligence officials announced publicly that they had broken up a ring of 30 CIA spies; U.S. officials later confirmed the breach to ABC News, which also reported on a potential compromise to the communications system.)

Iran executed some of the CIA informants and imprisoned others in an intelligence setback that one of the former officials described as “incredibly damaging.” The CIA successfully exfiltrated some of its Iranian sources, said former officials.

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The Iranian compromise led to significantly fewer CIA agents being killed than in China, according to former officials. Still, the events there hampered the CIA’s capacity to collect intelligence in Iran at a critical time, just as Tehran was forging ahead with its nuclear program.

U.S. authorities believe Iran probably unwound the CIA’s asset network analytically — meaning they deduced what Washington knew about Tehran’s own operations, then identified Iranians who held that information, and eventually zeroed in on possible sources. This hunt for CIA sources eventually bore fruit — including the identification of the covert communications system.

A 2011 Iranian television broadcast that touted the government’s destruction of the CIA network said U.S. intelligence operatives had created websites for fake companies to recruit agents in Iran by promising them jobs, visas and education abroad. Iranians who initially thought they were responding to legitimate opportunities would end up meeting with CIA officers in places like Dubai or Istanbul for recruitment, according to the broadcast.

Though the Iranians didn’t say precisely how they infiltrated the network, two former U.S. intelligence officials said that the Iranians cultivated a double agent who led them to the secret CIA communications system. This online system allowed CIA officers and their sources to communicate remotely in difficult operational environments like China and Iran, where in-person meetings are often dangerous.

A lack of proper vetting of sources may have led to the CIA inadvertently running a double agent, said one former senior official — a consequence of the CIA’s pressing need at the time to develop highly placed agents inside the Islamic Republic. After this betrayal, Israeli intelligence tipped off the CIA that Iran had likely identified some of its assets, said the same former official.

The losses could have stopped there. But U.S. officials believe Iranian intelligence was then able to compromise the covert communications system. At the CIA, there was “shock and awe” about the simplicity of the technique the Iranians used to successfully compromise the system, said one former official.

In fact, the Iranians used Google to identify the website the CIA was using to communicate with agents. Because Google is continuously scraping the internet for information about all the world’s websites, it can function as a tremendous investigative tool — even for counter-espionage purposes. And Google’s search functions allow users to employ advanced operators — like “AND,” “OR,” and other, much more sophisticated ones — that weed out and isolate websites and online data with extreme specificity.

According to the former intelligence official, once the Iranian double agent showed Iranian intelligence the website used to communicate with his or her CIA handlers, they began to scour the internet for websites with similar digital signifiers or components — eventually hitting on the right string of advanced search terms to locate other secret CIA websites. From there, Iranian intelligence tracked who was visiting these sites, and from where, and began to unravel the wider CIA network.

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U.S. intelligence officials were well aware of Iran’s formidable cyber-espionage capabilities. But they were flabbergasted that Iran managed to extirpate an entire CIA spy network using a technique that one official described as rudimentary — something found in basic how-to books.

But the events in Iran were not self-contained; they coincided roughly with a similar debacle in China in 2011 and 2012, where authorities rounded up and executed around 30 agents working for the U.S. (the New York Times first reported the extirpation of the CIA’s China sources in May 2017). Some U.S. intelligence officials also believe that former Beijing-based CIA officer Jerry Lee, who was charged with spying on behalf of the Chinese government in May 2018, was partially responsible for the destruction of the CIA’s China-based source network. But Lee’s betrayal does not explain the extent of the damage, or the rapidity with which Chinese intelligence was able to identify and destroy the network, said former officials.   

U.S. officials believe that Chinese intelligence obtained physical access to the transitional, or temporary, secret communications system used by the CIA to correspond with new, unvetted sources — and broke through the firewall separating it from the main covert communications system, compromising the CIA’s entire asset network in that country, Foreign Policy reported earlier this year.

It’s not clear whether China and Iran cooperated, but the former officials said the communications systems used in both countries were similar. The two governments may have broken the system independently. But Iranian, Chinese and Russian officials were engaged in senior-level communications on cyber issues around this time, recalled one former senior intelligence official —interactions that were “very suspicious in hindsight.”

The CIA declined to comment. The Iranian Mission to the UN did not respond to requests for comment.

Some U.S. intel officials took the interactions as an indicator of enhanced open coordination among these countries, and even a nascent alliance against the U.S. and its Five Eyes intelligence partners, this person said. (U.S. officials also believe Chinese officials subsequently shared information about their penetration of the secret CIA system with their Russian counterparts.)

“Our adversaries dramatically upped their game” in their offensive hacking operations, including those geared toward cracking the U.S. covert communications platforms, during this period, said another former senior intelligence official. This almost certainly included information sharing between these countries on U.S. covert communications techniques, said multiple former officials — the makings of a real-life “axis of evil.”

There were discrete signs of potential cooperation. Around the time of the purges of CIA informants in Iran and China, senior counter-espionage officials from China’s Ministry of State Security visited their counterparts in Tehran, said four former U.S. officials.

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Some officials believe the two countries engaged in a trade — perhaps with Iran providing China with the technical information needed to pinpoint signs of online activity on the communications system, in exchange for military hardware, speculated one former official. “That’s the spy service way,” said another former official.

With dawning horror, U.S. officials realized that once Iranian or Chinese intelligence officials were able to pinpoint CIA assets within their own borders, they were almost certainly capable of zeroing in on similar digital signatures in other countries, former officials said.

Former officials said the fallout from the compromises was likely global in scope — potentially endangering all CIA sources that used some version of this internet-based system worldwide.

“You establish these networks that are obviously critical to our ability to really understand what our adversaries are up to — there’s a pride in that — and when something that valuable starts to fall apart, the concern is, ‘Are we developing a house of cards?’” said one former senior official. “A lot of bells went off” during this time, said this person, because “whatever methods and procedures we were using were in jeopardy because of what the Chinese and Iranians had determined. You find that you’re blind.”

These multiple, overlapping failures of the communication system created systemic problems for the agency. “There was a cascade of effects that flowed outward” from the initial breaches, said another former intelligence official. “Part of the problem was trying to figure out the second and third order of effects.”

Repairing this breach had to be approached with extraordinary delicacy because attempted fixes can expose sources. Iran or China could then target and flip those CIA sources, or use information about them as bargaining chips with other intelligence services, former officials said. Around this time, Iranian intelligence officials also began aggressively pitching CIA officers to become double agents —meaning that they had somehow identified agency personnel, potentially through this wider compromise, said one former intel official.

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One country where the impact appears to have been contained is Russia. CIA officials who focus on Russia knew about the China ordeal and quickly adjusted their communications with sources accordingly, some of the former officials said. Aspects of the CIA’s Russia operations have historically been walled off from the rest of the agency, which likely helped minimize the damage. But the issue was so acute in the Middle East that the CIA was forced to suspend its use of internet-based covert communications systems there several times.

The problems were exacerbated by increasingly aggressive Iranian cyber-espionage. The Iranians “were very good tactically,” one former official said, and were adept at “breaking into low-level communications in the field, such as between Iraqi forces and their American counterparts.”

Starting around 2013, Iranian cyber experts seemed to be tracking CIA agents outside their own borders, including in Yemen, where Iran eventually compromised the internet-based covert communications system there, said one of the former officials. During this time, emergency meetings had to be scheduled at the agency because the Iranians had “hacked into systems outright that had nothing to do with them,” said this person — that is, those beyond Iran itself.

“Iran was aggressively going out to hunt systems down,” the former official said. “They weren’t just protecting themselves anymore.”

*****

 

As Iran was making fast inroads into the CIA’s covert communications system, back in Washington an internal complaint by a government contractor warning officials about precisely what was happening was winding its way through a Kafkaesque appeals system.

In 2008 — well before the Iranians had arrested any agents — a defense contractor named John Reidy, whose job it was to identify, contact and manage human sources for the CIA in Iran, had already sounded an alarm about a “massive intelligence failure” having to do with “communications” with sources. According to Reidy’s publicly available but heavily redacted whistleblower disclosure, by 2010 he said he was told that the “nightmare scenario” he had warned about regarding the secret communications platform had, in fact, occurred.

Reidy refused to discuss his case with Yahoo News. But two former government officials directly familiar with his disclosure and the investigation into the compromises in China and Iran tell Yahoo News that Reidy had identified the weaknesses — and early compromise — that eventually befell the entire covert communications platform.

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Reidy’s case was complicated. After he blew the whistle, he was moved off of his subcontract with SAIC, a Virginia company that works on government information technology products and support. According to the public disclosure, he contacted the CIA inspector general and congressional investigators about his employment status but was met with resistance, partially because whistleblower protections are complicated for federal contractors, and he remained employed.

Meanwhile, throughout 2010 and 2011, the compromise continued to spread, and Reidy provided details to investigators. But by November 2011, Reidy was fired because of what his superiors said were conflicts of interest, as Reidy maintained his own side business. Reidy believed the real reason was retaliation.

In his 2014 appeal to the intelligence community inspector general, first published by McClatchy News, Reidy describes the first signs of compromise in stunning detail — though it was unclear at the time, because of what was redacted, what issue he was addressing. “As our efforts increased, we started to notice anomalies in our operations … sources abruptly and without reason ceasing all communications with us,” he wrote.  

Something, he realized, was deeply wrong with the agency’s human sources network. The “U.S. communications infrastructure was under siege,” he wrote. Reidy warned that the problem wasn’t limited to a single country — it extended to everywhere the CIA operates. Close to 70 percent of operations at the time were potentially compromised, he noted. In other words, an entire class of CIA agents — those using some iteration of the online system — was in danger. “CIA is aware of this,” he wrote. “The design and maintenance of the system is flawed.”

Reidy’s complaint wasn’t fully addressed for many years. But when the wide-scale arrest of sources in Iran happened, the CIA eventually launched an investigation. The deaths in China sent investigators into overdrive. Teams from the CIA, the FBI and the House Permanent Select Committee on Intelligence scrambled to try to figure out what had happened — and how to stem the damage.

“Can you imagine how different this whole story would’ve turned out if the CIA [inspector general] had acted on Reidy’s warnings instead of going after him?” said Kel McClanahan, Reidy’s attorney. “Can you imagine how different this whole story would’ve turned out if the congressional oversight committees had done oversight instead of taking CIA’s word that he was just a troublemaker?”

Irvin McCullough, a national security analyst with the Government Accountability Project, a nonprofit that works with whistleblowers, put the issue in even starker terms. “This is one of the most catastrophic intelligence failures since Sept. 11,” he said. “And the CIA punished the person who brought the problem to light.”

The roll-up of the CIA’s networks reignited debates within the U.S. intelligence community about the merits of high-tech versus low-tech methods of communicating with sources. Within some corners of the intelligence world, “there was a widely held belief that technology was the solution to all communications problems,” according to one of the former officials. Proponents of older methods — such as chalk marks, burst communications, brush passes and one-time pads — were seen as “troglodytes,” said this official.

The failure of the communication system was discussed extensively in closed-door hearings at the House and Senate intelligence committees, according to several former officials. “Some of the senators and congressman went nuts about this, and they should have,” one of them said.

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A spokesperson for the Senate Intelligence Committee declined to comment. The House Intelligence Committee did not respond to requests for comments.

One of the central concerns among those familiar with the scope of the breakdown is the institutions responsible for it were never held accountable. Doing a comprehensive investigation isn’t easy, “but you have an absolute obligation to do that, because if you don’t, all you’re doing is rolling the dice with future lives,” said one former senior official.

Even several years after the breach, the concern within the intelligence community is accountability.

“When we continuously allow things like this to happen, and Congress doesn’t do anything, and the institutions don’t do anything, you’re going to have worse issues,” said another former official.

“People will say, ‘I went to the inspector general and it didn’t work; I went elsewhere and it didn’t work.’ People will see it as a game. It will lead to corruption, and it will lead to espionage. When people see that the system is corrupt, it affects everything.”

In the end, said the former official, “our biggest insider threat is our own institution.”

_____

Read more from Yahoo News:


Making Sense Of The Industrial Internet Of Things (Lessons From GE Digital) | killexams.com real questions and Pass4sure dumps

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Microservice Principles: Smart Endpoints and Dumb Pipes | killexams.com real questions and Pass4sure dumps

As engineering organizations transition from building monolithic architecture to building microservices architecture one challenge they often face is understanding how to enable communications between microservices.

In a monolith the various components are all in the same process, just a function call away. But in a microservice environment components are separated by hard boundaries. In fact, a true microservice environment will often have the various components distributed across a cluster of instances. Microservices are not even necessarily collocated on the same machine.

The best way to solve this problem of communicating between microservices is by following the principle of “smart endpoints and dumb pipes” as explained in Martin Fowler’s 2014 paper defining microservices. This article elaborates on Martin Fowler’s concept, and explains modern techniques for building microservice communications that follow the “dumb pipe” paradigm.

Types of Microservice Communication

There are two primary forms of communication between microservices that need to be solved for:

  • Request-Response: One service invokes another service by making an explicit request, usually to store or retrieve data. The service then expects a response: either a resource or an acknowledgement.
  • Observer: Event based, implicit invocation where one service publishes an event and one or more observers that were watching for that event respond to it by running logic asynchronously, outside the awareness of the producer of the event.
  • To illustrate these two types of communication consider the following microservice architecture for a basic social media application:

    Diagram of user signup flow for a social media application

    When a user signs up to create an account their client makes a POST request to an API endpoint to send the backend API their basic profile information such as name, password, email address, etc. Because this is a microservices architecture, this initial request fans out calls to several backend microservices that handle the underlying features.

    There is a core user metadata service that stores the basic profile information, and a password service that hashes the password plaintext and stores it for later comparison when the user logs in. There are also a couple microservices that run in the background in response to user signup. One emails the user asking them to click a link to verify their email address, while another starts searching for friends to recommend to the user.

    The two initial requests to persist the profile info and password are explicit request-response communications. The user signup endpoint can’t return a 200 OK response to the client until both of these pieces of data have been persisted in the backend. On the other hand, the client shouldn’t have to wait for the verification email to be sent out or the friend recommendations to be generated. For these two features it is better to have an observer pattern where the backend services are watching for the user signup event and are triggered asynchronously.

    Understanding where and when to use a request-response model versus an observer model is key to designing effective microservice communication.

    Anti-pattern: Centralized Service Bus

    Building a complex centralized communication bus that runs logic to route and manipulate messages is an architectural pitfall that tends to cause problems later on. Instead, microservices favor a decentralized approach: services use dumb pipes to get messages from one endpoint to another endpoint.

    At first glance the diagram of the central bus may seem less scary than the network of many direct connections that result when microservice communication is decentralized. However, it’s important to consider that the same tangle of connections still exists in the central bus. In fact, all those communication routes are now embedded in one monolithic component. This central monolith has a tendency to become excessively complex and can become a bottleneck both from a performance standpoint as well as an engineering standpoint.

    Decentralized microservice communications enable engineering teams to do parallel work on different edges of the architecture without breaking other components. If each microservice treats other services as external resources with no differentiation between internal services and third party resources, it means each microservice encapsulates its own logic for formatting its outgoing responses or supplementing its incoming requests. This allows teams to independently add features or modify existing features without needing to modify a central bus. Scaling the microservice communications is also decentralized so that each service can have its own load balancer and scaling logic.

    Request-Response Model

    Request-response communication between microservices is used anywhere in which one service sends a request and expects either a resource or acknowledgment response to be returned.

    The most basic way to implement this pattern is using HTTP, ideally following REST principles. A standard HTTP based communication pipeline between two microservices typically looks like this:

    In this approach, a simple load balancer can sit in the middle so that the originating service can make an HTTP request to a load balancer and the load balancer can forward the request to one of the instances of the backing microservice.

    However, in some cases there is extremely high traffic between services, or engineering teams want to reduce latency between microservices as much as possible. In this case they may adopt thick client load balancing. This approach typically uses a system such as Consul, Eureka, or ZooKeeper to keep track of the set of microservice instances and their IP addresses. Then the originating microservice is able to make a request directly to an instance of the backing service that it needs to talk to.

    Consul maintains a DNS record that resolves to the different backend microservice instances so that one service can talk directly to another service, with no load balancer in-between.

    Another framework of note is GRPC, which has emerged as a strong convention for polyglot applications. GRPC can operate using an external load balancer, similar to the HTTP approach above, or it can also use a thick client load balancer. The distinguishing characteristic of GRPC, however, is that it translates communication payloads into a common format called protocol buffers.

    Protocol buffers allow backend services to serialize communication payloads into an efficient binary format for travel over the wire, but then deserialize it into the appropriate object model for their specific runtime.

    Observer Model

    Observer communication is critical to scaling out microservices. Not every communication requires a response or an acknowledgement. In fact, in many workflows there are at least a few pieces of logic that should be fully asynchronous and nonblocking.

    The standard way for distributing this type of workload is to pass messages using a broker service, ideally one that implements a queue. RabbitMQ, ZeroMQ, Kafka, or even Redis Pub/Sub can all be used as dumb pipes that allow a microservice to publish an event, while allowing other microservices to subscribe to one or more classes of events that they need to respond to.

    Organizations running workloads on Amazon Web Services often favor using Amazon Simple Notification Service (SNS), and Amazon Simple Queue Service (SQS) as a fully managed solution for broadcast communication. These services allow a producing service to make one request to an SNS topic to broadcast an event, while multiple SQS queues can be subscribed to that topic, with each queue connected to a single microservice that consumes and responds to that event.

    The huge advantage of this approach is that a producing service does not need to have any knowledge of how many subscribers there are to the event, or what they are doing in response to the event. In the event of a consumer failure most queuing systems have a retry / redelivery feature to ensure that the message is eventually processed. The producer can just “fire and forget”, trusting that the message broker’s queue will ensure that the message eventually reaches the right consumers. Even if all consumers are too busy to respond to the event immediately, the queue will hold onto the event until a consumer is ready to process it.

    Another benefit of the observer model is future extendability of a microservices system. Once an event broadcast is implemented in a producer service, new types of consumers can be added and subscribed to the event after the fact without needing to change the producer. For example, in the social media application at the start of the article there were two consumers subscribed to the user signup event: an email verification service, and a friend recommendation service. Engineers could easily add a third service that responded to the user signup event by emailing all the people who have that new user in their contacts to let them know that a contact signed up. This would require no changes to the user signup service, eliminating the risk that this new feature might break the critical user signup feature.

    The observer model is a very powerful tool to have in a microservices deployment, and no microservice architecture can reach its full potential without having at least some observer based communications.

    Conclusion

    The microservice principle of smart endpoints and dumb pipes is easy to understand when you embrace the concept of decentralization of architecture and logic. Despite using “dumb pipes” microservices can still implement essential messaging primitives without the need for a centralized service bus. Instead, microservices should make use of the broad ecosystem of frameworks that exist as dumb pipes for both request-response and observer communications.



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