2012年思科认证考试模拟试题1
1. Spanning Tree Protocol calculates path cost based on which of these?
生成树中的计算成本值和哪个参数有关
A. interface bandwidth
B. interface delay
C. interface bandwidth and delay
D. hop count E. bridge priority
Answer: A
2. What two features in Cisco switches help prevent Layer 2 loops? (Choose two.)
那两个是CISCO交换机的2层防环的功能
A. UniDirectional Link Detection单向链路检测
B. Hot Standby Router Protocol
C. Virtual Router Redundancy Protocol
D. PortFast E. root guard F. loop guard环路保护
Answer: AF
3. Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D? 哪个是在802.1W和802.1D协议对于BPDU信息的差异
A. 802.1D bridges do not relay BPDUs.
B. 802.1w bridges do not relay BPDUs.
C. 802.1D bridges only relay BPDUs received from the root.
D. 802.1w bridges only relay BPDUs received from the root.
Answer: C
3. 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
4. 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
5. 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
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