ccnp 642-845 3月7日 1000 pass

eechen

题库比较稳定，实验题show run 稍微看下分类及对应的DSCP值即可，有时参数或顺序会变化。
1. Which IOS feature provides dial pan scalability and bandwidth management for H.323 VoIP implementations?
A. Gatekeeper
. _5 Y2 M% _8 u2 ZB. Call Routing
C. Call Admission Control
$ t2 K- l% w  h+ ?D. Digital Signal Processors
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Answer: A
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1. Refer to the exhibit. Which statement is true?
A. Telnet packet with a source address of 10.1.1.2 will be denied access to the control plane.
B. Telnet packet with a source address of 10.1.1.2 forwarded to the control plane will be policed at he specified rate.
C. Telnet packets with a source address of 10.1.1.2 will be forwarded to be the control plane without constraint.
D. Telnet packet with a destination address of 10.1.1.1 will be forwarded to the control plane without constraint.

Answer: C
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3. Which two statements about WRED are true? (Choose two .)
4 ^7 j$ d$ R, eA. WRED can selectively discard priority traffic when the interface becomes congested and can provide differentiated performance characteristics for different classes of service.
: h0 z' A* h9 |0 }B. Resource Reservation Protocal (RSVP) and WRED cannot be configured on the same interface.
C. WRED will throttle back voice traffic only as a last resort.
D. If the average queue length is greater than the minimum threshold but less than the maximum threshold, the based on the drop probability, WRED will either queue the packet or perform a random drop.
- T3 _' c5 Y' ^- ^E. WRED statistically drops more packets from low-bandwidth users than high-bandwidth users. Therefore, traffic source that generate the least traffic are more likely to be slowed down than traffic source that generate the most traffic.
0 n+ M" H+ Q( uF. WRED treats non-IP traffic as precedence 4.
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Answer: AD

4. What is the purpose of the NBAR protocol discovery?
A. to build a Packet Description Language Module(PDLM) file to be used in protocol matching
B. to discover applications and build class maps for data classification
C. to look into the TCP or UDP payload and classify packets based on the content
D. to build a database of all application data that passes through the router and queue the data accordingly

Answer: C
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5. Which two functions can be provided by an Integrated Services Router (ISR) in a VoIP network? (Choose two)
A. ISR can perform the functions of a multipoint control unit to facilitate voice conferencing.
B. ISR can perform the function of a call agent in the event loss of communication with a CallManager .
C. ISR can provide XML applications to the phones.
D. ISR can provide all of the functionality of a CallMannager in the event of loss of communication to the CallManager.
5 o' D+ \1 g7 D* W' S) r! lE. ISR can act as a voice gateway to the PSTN.

Answer: BE

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