Testking cisco 642-567
Vendor: cisco
Exam Code: 642-567
Exam Name: Advanced Security for Field Engineers (Others Certification )
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Question: 6
Under which circumstances will you use QPM? (Choose all that apply.)
A. When monitoring queue depth.
B. When ensuring end to end QOS commitments.
C. When measuring client response time.
D. When defining rules that match business requirements
E. When creating and deploying a decentralized enterprise-wide QOS policy.
Answer: B, D
Explanation:
You can use the Cisco QoS Policy Manager (QPM) to overcome the configuration correctness
and consistency problem. QPM creates the QoS configurations for you, based on your input
about QoS policies using a GUI. QPM loads the configurations, and re-verifies the QoS
configurations to discover whether changes have been made. It can also reconfigure a router
after someone has inadvertenly changed the QoS configuration – automatically. Any large QoS
implementation begs for the use of QPM.
Question: 7
QDM Performance Monitor will graph which of the following metrics? (Choose all that apply.)
A. Drop Rate.
B. Packet Collisions and FCS error rates.
C. Pre/Post Policy Bit rate / Byte count /Packet Count.
D. Queue Depth.
E. Round trip packet delay.
F. All of the above.
Answer: A, C, D
Explanation:
The QDM user can perform two types of tasks. First, the user can configure QoS tools using a
graphical interface from a browser. The user can also monitor real-time statistics about QoS
behavior inside the single device, including graphs of bit/byte/packets rates, drop rates, queue
depth, and so on.
Reference:
DQOS Exam Certification Guide p.660
Question: 8
Which of the following show commands will display information regarding frame-relay
fragmentation?
A. Show frame-relay pvc
B. Show frame-relay queue
C. Show frame-relay fragment
D. Show frame-relay tracert
E. Show frame-relay traffic shaping
Answer: C
Explanation:
The show frame-relay fragment command displays statistics of Frame Relay fragmentation
methods. This output shows whether Frame Relay fragmentation is in effect and working as
configured. The ouput also shows possible fragmentation timeouts, indicating that some
fragments were lost in the Frame Relay network and could not be reassembled. If the number of
timeouts is significant, this may indicate significant frame loss in the Frame Relay network.
Reference:
Introduction to IP QoS p.6-62
Question: 9
Disregarding fragment size, which of the following LFI mechanism never fragments voice frames?
A. FRF .3
B. FRF.9
C. FRF.11 Annex C
D. FRF.6
E. FRF .12
Answer: C
Explanation:
FRF.11 Annex C never fragment voice frames.
Only this LFI mechanism is used with voice traffic.
There are three LFI mechanisms implemented in Cisco IOS:
1) Multilink PPP with Interleaving is by far the most common and widely used form of LFI.
2) FRF.11 Annex C LFI is used with Voice over Frame Relay (VoFR).
3) FRF.12 Frame Relay LFI is used with Frame Relay data connections.
4) In an ATM network, using separate PVCs carrying voice and data can be used to interleave
packets when they are output on an interface.
Reference:
Introduction to IP QoS p.6-47
Question: 10
Which of the following statements regarding cRTP compression is valid?
A. IP, TCP, and RTP headers are compressed, since the headers are uncompressed on the other
end of the link.
B. UDP and RTP headers are compressed, but the IP header is not, so the VoIP packets can be
delivered to the terminating gateway.
C. IP, UDP, and RTP headers are compressed, since the headers are uncompressed on the
other end of the link.
D. TCP and RTP headers are actually removed, with a smaller header added that includes
information that has changed since the last full header sent.
E. None of the above.
Answer: C
Explanation:
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