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。+ O, p6 ~' K) E: f* I% i( y5 ~
1. Which IOS feature provides dial pan scalability and bandwidth management for H.323 VoIP implementations?3 Z; u1 e9 x/ G) I) M+ A
A. Gatekeeper
. _5 Y2 M% _8 u2 ZB. Call Routing# B6 h; B/ [4 O7 |4 D. W
C. Call Admission Control
$ t2 K- l% w h+ ?D. Digital Signal Processors
$ y+ {. z! o7 V+ j8 N4 k; iAnswer: A
1 x: d+ P4 A! g$ ~ 1. Refer to the exhibit. Which statement is true?( H# Z% [- k6 M& G: a) k
A. Telnet packet with a source address of 10.1.1.2 will be denied access to the control plane. S$ a X+ b+ ]
B. Telnet packet with a source address of 10.1.1.2 forwarded to the control plane will be policed at he specified rate." U; D* T4 _: T
C. Telnet packets with a source address of 10.1.1.2 will be forwarded to be the control plane without constraint.# ?1 n) U1 T$ a2 R% ~
D. Telnet packet with a destination address of 10.1.1.1 will be forwarded to the control plane without constraint./ Z! J* g, G0 I3 U1 w1 T5 ?/ M
Answer: C
7 N: ]8 C( E2 U& ~/ k5 l 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.5 |# y! n- u o
C. WRED will throttle back voice traffic only as a last resort.% T6 C1 z: m: h6 l4 f. c
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.
* `- v4 @; w. p! xAnswer: AD* o# x( a9 @ V4 G+ T4 {
4. What is the purpose of the NBAR protocol discovery?2 S5 }8 d b6 P1 ?! Z' b9 ?$ y H; p
A. to build a Packet Description Language Module(PDLM) file to be used in protocol matching , K9 \. P) f+ D& F1 Q' G5 p i1 S
B. to discover applications and build class maps for data classification6 {$ ~, H2 a+ I7 ~* X9 Y4 J% `8 D
C. to look into the TCP or UDP payload and classify packets based on the content 4 r5 G. k+ t; K9 I+ T5 L4 r
D. to build a database of all application data that passes through the router and queue the data accordingly% \( Z8 o( C3 k0 B4 y& Y
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); g* m7 A! T& b: V! Q' M
A. ISR can perform the functions of a multipoint control unit to facilitate voice conferencing.# @" q/ l1 r2 y1 l
B. ISR can perform the function of a call agent in the event loss of communication with a CallManager .8 ]+ w, B$ J& p3 O5 r- F% N3 v
C. ISR can provide XML applications to the phones.) `, T+ \0 c/ e
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.* f& B; r2 y9 i9 A6 @
Answer: BE' G4 x+ t0 c- Q
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