2012年思科认证考试模拟试题2
6. Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention? (Choose two.)
环路检测和单向链路检测，保证2层STP没有环路。这两种做法不同于UDLD中的环路检测 吗？
A. Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.
B. UDLD protects against STP failures caused by cabling problems that create one-way links.
UDLD 是为了防止电缆故障，造成一个单向故障
C. Loop guard detects and protects against duplicate packets being received and transmitted on different ports.
D. UDLD protects against unidirectional cabling problems on copper and fiber media. E. Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
Answer: BE
7. In Layer 2 topologies, spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limit excessive traffic during spanning-tree loop conditions? (Choose two.)
在2层的拓扑中，生成树发生故障会导致网络的环路。成环的网络中的流量可以导致网络的瘫痪。在6500交换机中哪两个功能可以防止生成树的环路过高的流量
A. loop guard
B. storm control 思科认证考试
C. storm suppression
D. broadcast suppression
E. BPDU guard Answer: BD
8. Why does RSTP have a better convergence time than 802.1D?
为什么快速生成树协议收敛时间比802.1d的收敛时间更短
A. it is newer
B. it has smaller timers
C. it has less overhead
D. it is not timer-based
Answer: D
9. Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these?
哪个是生成树协议802.1s的定义。？
A. one global STP instance for all VLANs
B. one STP instance for each VLAN
C. one STP instance per set of VLANs
D. one STP instance per set of bridges
Answer: C
10. Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree Protocol IEEE 802.1D? (Choose two.)
在生成树协议802.1D中，选择根桥需要用到那两个参数？
A. Designated Root Cost
B. bridge ID priority
C. max age
D. bridge ID MAC address
E. Designated Root Priority
F. forward delay
Answer: BD
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