Exam Number: 642-973 Exam
Associated Certifications: Cisco Data Center Networking Infrastructure Support - 1
Duration: 58 Q&As
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642-973 Exam: pass4sure Programming with Implementing Cisco Data Center Networking Infrastructure Support - 1
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ONT - Optimizing Converged Cisco Networks : 642-845 Exam
QUESTION NO: 1
You need to implement QoS for the Certifyme.com VOIP network. Which three
statements are true about the data traffic characteristics of voice traffic? (Select
three)
A. Voice packets require TCP for rapid retransmission of dropped packets.
B. Latency is not a concern as long as jitter is kept below 30 ms.
C. Voice packets require a fairly constant bandwidth reserved for voice control traffic as
well as for the voice payload.
D. Voice packets do not require a specific type of queuing.
E. Latency must be kept below 150 ms.
F. Voice packets are rather small
Answer: C, E, F
Explanation:
QoS refers to the ability of a network to provide improved service to selected network
traffic over various underlying technologies including Frame Relay, ATM, Ethernet and
802.3 networks, SONET, and IP-routed networks.
QoS features provide improved and more predictable network service by offering the
following services:
1. Dedicated bandwidth
2. Improved loss characteristics
3. Congestion management and avoidance
4. Traffic shaping
5. Prioritization of traffic
Voice quality is directly affected by all three QoS quality factors such as loss, delay, and
delay variation.
Loss causes voice clipping and skips. Industry standard codec algorithms can correct for
up to 30 ms of lost voice. Cisco Voice over IP (VoIP) technology uses 20 ms samples of
voice payload per VoIP packet. Only a single Real Time Transport (RTP) packet could
be lost at any given time. If two successive voice packets are lost, the 30 ms correctable
window is exceeded and voice quality begins to degrade.
Delay can cause voice quality degradation if it is above 200 ms. If the end-to-end voice
delay becomes too long, the conversation sounds as if two parties are talking over a
satellite link or a CB radio. The ITU standard for VoIP, G.114, states that a 150 ms
one-way delay budget is acceptable for high voice quality. With respect to delay
variation, there are adaptive jitter buffers within IP Telephony devices. These buffers can
usually compensate for 20 to 50 ms of jitter.
QUESTION NO: 2
Certifyme.com uses G.711 for the VOIP calls. When analog signals are digitized using the
G.711 codec, voice samples are encapsulated into protocol data units (PDUs)
involving which three headers? (Select three)
A. UDP
B. RTP
C. IP
D. TCP
E. Compressed RTP
F. H.323
Answer: A, B, C
Explanation:
When a VoIP device, such as a gateway, sends voice over an IP network, the digitized
voice has to be encapsulated into an IP packet. Voice transmission requires features not
provided by the IP protocol header; therefore, additional transport protocols have to be
used. Transport protocols that include features required for voice transmission are TCP,
UDP, and RTP. VoIP utilizes a combination of UDP and RTP.
QUESTION NO: 3
VOIP has been rolled out to every Certifyme.com location. What are three features and
functions of voice (VOIP) traffic on a network? (Select three)
A. Voice traffic is bursty
B. Voice traffic is retransmittable
C. Voice traffic is time-sensitive
D. Voice traffic is bandwidth intensive
E. Voice traffic is constant
F. Voice traffic uses small packet sizes
Answer: C, E, F
Explanation:
The benefits of packet telephony networks include
i. More efficient use of bandwidth and equipment: Traditional telephony networks use
a 64-kbps channel for every voice call. Packet telephony shares bandwidth among
multiple logical connections.
ii. Lower transmission costs: A substantial amount of equipment is needed to combine
64-kbps channels into high-speed links for transport across the network. Packet
telephony statistically multiplexes voice traffic alongside data traffic. This consolidation
provides substantial savings on capital equipment and operations costs.
iii. Consolidated network expenses: Instead of operating separate networks for voice
and data, voice networks are converted to use the packet-switched architecture to create a
single integrated communications network with a common switching and transmission
system. The benefit is significant cost savings on network equipment and operations.
iv. Improved employee productivity through features provided by IP telephony: IP
phones are not only phones, they are complete business communication devices. They
offer directory lookups and access to databases through Extensible Markup Language
(XML) applications. These applications allow simple integration of telephony into any
business application. For instance, employees can use the phone to look up information
about a customer who called in, search for inventory information, and enter orders. The
employee can be notified of a issue (for example, a change of the shipment date), and
with a single click can call the customer about the change. In addition, software-based
phones or wireless phones offer mobility to the phone user.
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BEA and Oracle have merged their businesses in the United States, Canada, Argentina, Mexico, Brazil, United Kingdom, Sweden, Israel, Switzerland, Belgium, Netherlands, Denmark, Norway, Czech Republic, Austria, Hungary, Russia, Slovakia, Turkey, Greece, Middle Eastern Arab States, South Africa, Australia, New Zealand, Singapore, Taiwan, Hong Kong, China, India and Brazil. If you are a customer from one of the merged countries, please find BEA Certification information at the Oracle Certification web site. If you have any questions, please contact beacert_ww@oracle.com.
As part of our continued commitment to building competency on BEA technology, BEA Education Services offers a number of certification paths focused on BEA product technology, as well as BEA’s approach to Service-Oriented Architecture (SOA). The BEA Certification Program provides valuable, measurable rewards to IT professionals, their managers, and the BEA technology-based organizations that employ them.
Read more about the program.
Note 1: BEA Certification Exam Registration Change
As of May 31, 2008 BEA certification exams can now be purchased and registered for directly via Prometric. As of May 31, 2008 BEA will no longer require that you purchase an examination voucher from Education Services. For those of you who have already purchased an exam voucher from BEA Education which has not yet expired, you can still use this code when registering for your exam at Prometric after May 31, 2008. For more details on how to register for an exam please click here.
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2. Testking 0B0-102 BEA Certified Developer: Portal Solutions for BEA WebLogic 8.1
3. Testking 0B0-103 BEA Certified Developer: Integration Solutions for BEA WebLogic 8.1/8.5
4. testking 0B0-104 BEA Certified Administrator: System Administration for BEA WebLogic 8.1
5. Testking 0B0-105 BEA Certified Architect: Enterprise Architecture for BEA WebLogic 8.1
Starting on September 30, 2008 these exams and designations will no longer be available as certification options to candidates. Candidates who wish to earn their BEA Certified title associated with the above exams must pass them by September 30, 2008
Tuesday, September 2, 2008
free download google chrome
Google Chrome : Download Google Chrome Browser
Google Inc is releasing its own Web browser in a long-anticipated move aimed at countering the dominance of Microsoft Corp's Internet Explorer and ensuring easy access to its market-leading search engine.
The free browser, called "Chrome," is supposed to be available for downloading Tuesday in more than 100 countries for computers running on Microsoft's Windows operating system. Google said it's still working on versions compatible with Apple Inc's Mac computer and the Linux operating system.
Google's browser is expected to hit the market a week after Microsoft's unveiling of a test version of its latest browser update, Internet Explorer 8.
The tweaks include more tools for Web surfers to cloak their online preferences, creating a shield that could make it more difficult for Google and other marketing networks to figure out which ads are most likely to appeal to which individuals.
Although Google is using a cartoonish approach to promote Chrome, the new browser underscores the gravity of Google's rivalry with Microsoft, whose Internet Explorer is used by about 75 percent of Web surfers.
Google Inc is releasing its own Web browser in a long-anticipated move aimed at countering the dominance of Microsoft Corp's Internet Explorer and ensuring easy access to its market-leading search engine.
The free browser, called "Chrome," is supposed to be available for downloading Tuesday in more than 100 countries for computers running on Microsoft's Windows operating system. Google said it's still working on versions compatible with Apple Inc's Mac computer and the Linux operating system.
Google's browser is expected to hit the market a week after Microsoft's unveiling of a test version of its latest browser update, Internet Explorer 8.
The tweaks include more tools for Web surfers to cloak their online preferences, creating a shield that could make it more difficult for Google and other marketing networks to figure out which ads are most likely to appeal to which individuals.
Although Google is using a cartoonish approach to promote Chrome, the new browser underscores the gravity of Google's rivalry with Microsoft, whose Internet Explorer is used by about 75 percent of Web surfers.
I’m here at the Googleplex for a press conference to announce the new Google browser, called Chrome. The service will go live at 12 Noon PT today and is available for Windows Vista and XP - for now. Mac and Linux versions are coming soon. It will launch in 122 countries and 43 languages. It is also fully open-source. (Download it here.)
The presentation begins with an explanation of Chrome, acknowledging that it’s a complex product that is needed in an age when the Web has also become more complex. Example: Google Maps and add-on features like Street View. Google says the guts of the browser - the core infrastructure of it - is still very much the same as it was a decade or more ago.
Google pushes simple use and a sophisticated core. Just look at how clean and simple the Google search page. Google Chrome is built on the same idea - clean and simple to use. The browser, Google says, is just another application and the company wants people to “forget” that they’re using a browser.
At it’s core is Webkit, an open-source rendering enginer - the same used by Safari. The browser in Android also uses Webkit. The browser also uses a multi-process architecture. Each tab within the browser runs independently, making the browser faster and more responsive. If one tab slows down or crashes, it doesn’t affect the others. The company says it also enhances security features by operating in a “sandbox,” and not allowing corrupt the whole system.
The company also announced today Chromium, the open source project.
Update: In Chrome, the “omnibox” is both the search and address box. It incorporates a feature that fills in the blank, remembering sites where you go regularly. One cool feature: incorporating search fields from other sites - such as Amazon - into the search box of Chrome. Example: If you go into Chrome and type Amazon and then search for Stephen King, the next time you go to Amazon on Chrome, it incorporates a search field to search within Amazon - before you get to that site.
Update: When you create a new tab, instead of bringing up a blank page or home page, it creates a “new tab” page that shows links and images to most visited pages, recently closed tabs and search engine boxes for favorite sites such as Yelp, Wikipedia and Amazon. In Google Chrome, there is also an “incognito window” feature - which is much like the private browsing feature found in IE8 (often called porn mode.) The history from this browsing experience does not appear on the computer.
Update: Google has reinvented the download process, as well, placing shortcuts to the downloaded files to the bottom of the page - not forcing users to search for them in folders. From there, the files can be dragged to other locations. There is also a feature that treats some Web applications as computer applications. For example, Gmail, which is an always-on application for some people, can be launched from a desktop shortcut - just like a real app - and open in its own window, without the address bar and other tools it doesn’t need.
Update: They’re talking about the multi-processing tabs that work independently of each other. Security benefits from the architecture takes away the privileges of accessing files on the computer that it doesn’t need - such as registry files. In other browsers, bad guys looking to install malware only have to find the files to corrupt in the system. But in Chrome, there’s an added layer of security by not allowing access outside of the browser, keeping bad guys get trapped in the sandbox - the closed, independent browser that’s running.
Update: As the press conference wraps up, Google re-emphasizes that Chrome is fully open-source and is not tied to Google search or any other Google application. Larry Page makes a cameo to offer his support for the product and congratulate the Chrome team on its work. He noted that we don’t want to love in a world where things can’t be improved and that’s why Google is committed to the open-source platform with Chrome. Advancements, he said, can be made much faster than in the past by using that mindset. He notes that it’s challenging to build a browser but that it’s been tested for some time inside the walls of Google and the response has been good.
The press conference ends and Google opens the floor to questions.
Update: Google gives props to Mozilla for re-igniting browser technology advancements and said the companies will continue to work together closely. There’s hope that, just as Google has tapped existing tools and technologies to develop Chrome, it hopes that others will also implement Chrome’s technologies, as well.
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