思科认证CCIE考试模拟试题18
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86.Based on the network displayed in the exhibit, both PG-R1 and PG-R2 are configured as EIGRP stub routers. If the link between PG-R1 and PG-R3 is down, will PG-R3 still be able to reach 192.168.1.0/24, and why or why not? 在给出的网络图中，PG-R1 and PG-R2都配置了EIGRP stub，如果PG-R1 和 PG-R3中链路down掉了，PG-R3仍然能到192.168.1.0/24吗？为什么？
A. No. PG-R3 would remove its route to 192.168.1.0/24 through PG-R1, but would not query PGR2 for an alternate route, since PG-R2 is a stub. B. No. The path through PG-R2 would always be considered a loop at PG-R3. C. Yes. When a directly connected link fails, a router is allowed to query all neighbors, including stub neighbors, for an alternate route. D. Yes, because PG-R3 would know about both routes, through PG-R1 and PG-R2, before the link between PG-R1 and PG-R3 failed.
Answer: A
87.On the basis of the exhibit provided, assuming that EIGRP is the routing protocol, then at R5, what would be the status of each path to 172.30.1.0/24? 在给出的图中，假设路由协议是EIGRP，在R5，将是什么状态在每条路径到 172.30.1.0/24？
A. the path through PG-R3 would be the successor, the path through PG-R1 would be a feasible successor, and the path through PG-R4 would be neither a successor nor a feasible successor B. not enough information has been given to figure out what the status of each route would be C. the path through PG-R3 would be the successor, and the paths through PG-R1 and PG-R4 would be feasible successors D. the path through PG-R1 would be the successor, the path through PG-R3 would be a feasible successor, and the path through PG-R4 would be neither a successor nor feasible successor
Answer: A
88、Based on the network provided in the exhibit, in these two areas, all routers are performing OSPF on all interfaces. After examining the OSPF database on PG-R4, do you know which type of LSA will contain 10.1.5.0/24, and which router will have originated it? 基于给出的网络，在两个区域里，全部的路由器全部的接口都运行OSPF，在检查 PG-R4的OSPF数据库后，你知道哪个类型的LSA包含了10.1.5.0/24，哪个路由器 有它的源？
A. 10.1.5.0/24 will be in a summary (type 3) LSA originated by PG-R3. B. 10.1.5.0/24 will be in a router (type 1) LSA generated by PG-R3. C. 10.1.5.0/24 will be in a network (type 2) LSA originated by PG-R3. D. 10.1.5.0/24 will not be in any LSA in the OSPF database at PG-R4, because PG-R4 and PGR3 are in different areas. Answer: A
89. Which statement correctly describes the disabling of IP TTL propagation in an MPLS network?
哪种说法正确地描述了MPLS网络中IP传输的TTL是禁用的
A. The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR. B. TTL propagation cannot be disabled in an MPLS domain. C. TTL propagation is only disabled on the ingress edge LSR. D. The TTL field of the MPLS label header is set to 255.
TTL失效是因为 MPLS的标签头的TTL字段设置为255
E. The TTL field of the IP packet is set to 0.
Answer: D
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