思科认证CCIE考试模拟试题4
16. Which of these best describes the actions taken when a VTP message is received on a switch configured with the VTP mode "transparent"?
那一项最能说明，收到的VTP信息是从透明模式的交换机收到的？
A. VTP updates are ignored and forwarded out all ports.
B. VTP updates are ignored and forwarded out trunks only.
C. VTP updates are made to the VLAN database and are forwarded out trunks only.
D. VTP updates are ignored and are not forwarded.
Answer: B
17. The classic Spanning Tree Protocol (802.1D 1998) uses which sequence of variables to determine the best received BPDU?
基本的生成树协议(802.1D)，使用哪些参数来确定最佳的BPDU的包
A. 1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest port id, 4) lowest root path cost
B. 1) lowest root path cost, 2) lowest root bridge id, 3) lowest sender bridge id, 4) lowest sender port id
C. 1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest root path cost 4) lowest sender port id
D. 1) lowest root bridge id, 2) lowest root path cost, 3) lowest sender bridge id, 4) lowest sender port id Answer: D
18. Which three port states are used by RSTP 802.1w? (Choose three.)
哪三个状态出现在RSTP 802.1W中
A. Listening
B. Learning
C. Forwarding
D. Blocking
E. Discarding
F. Disabled
Answer: BCE
19. Under which two circumstances would an RSTP bridge flush its CAM table? (Choose two.) 在哪两种情况下RSTP桥会刷新MAC地址表
A. upon a port state change
B. upon receiving a topology change notification接到拓扑发生改变的通知
C. when transitioning from discarding to forwarding从丢弃状态过度到转发状态时
D. when transitioning from forwarding to discarding
E. only when changing from listening to discarding
F. when CAM resources have been completely used up
Answer: BC
20. Which three of these statements about Dynamic Trunking Protocol are correct? (Choose three.) 对于动态中继协议，下面哪三个是正确的
A. It supports autonegotiation for both ISL and IEEE 802.1Q trunks.
支持在ISL协议和802.1Q协议的自动协商
B. It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk.
如果你不想让一个接口成为trunk或开始协商成trunk，那么必须禁用它
C. It is a point-to-multipoint protocol.
D. It is a point-to-point protocol. 需要在一个点到点的协议上使用
E. It is not supported on private VLAN ports or tunneling ports.
Answer: ABD
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