单项选择题The routers named Testking1 and Testking2 are both configured with RIP only.What will happen in the event of Testking1 receiving a routing update that contains a higher cost path to a network already in its routing table?()

A. The update information will be added to the existing routing table.
B. The update information will replace the existing routing table entry.
C. The update will be ignored and thus no further action will occur.
D. The existing routing table entry will be purged from the routing table and all routers will attempt convergence.


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2.单项选择题

A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table.
What will the router do in this situation?()

A. It will ignore the update and take no further action.
B. It will add the update information to its routing table.
C. It will replace the existing routing table entry with the update information.
D. It will delete the existing routing table and will send out hello packets to rebuild the routing table.

3.单项选择题

The Testking network is utilizing RIP as the IP routing protocol. Router TK1 learns how to reach the same destination via 6 different paths. All paths have the same metric and administrative distance.
With all routers using the default operation,which of the paths will be chosen to reach the destination?()

A. Only the first two paths that are learned.
B. Four of the paths.
C. All six routes in a routed robin fashion.
D. The oldest two paths in the routing table.
E. The first path learned to the destination network.

4.多项选择题Which of the following statements are correct in regard to classless routing protocols?()

A. Discontiguous subnets are not allowed.
B. Variable length subnet masks are allowed.
C. RIP v1 is a classless routing protocol.
D. IGRP supports classless routing within the same autonomous system.
E. RIP v2 supports classless routing.

5.单项选择题Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?()

A. Only routers can split boundaries (horizons) between concentric networks.
B. Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
C. Networks can only remain fully converged if all information is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update came.
E. Distance vector protocols need fall back routers that are responsible for momentary loops.

6.单项选择题What kind of packets does OSPF send to keep up connectivity with its neighboring routers?()

A. SPF packets
B. hello packets
C. keepalive packets
D. dead interval packets
E. LSU packets

7.多项选择题What kind of information does a router running a link-state routing protocol need to create and maintain its topological database?()

A. LSAs from other routers
B. Beacons received on point-to-point links
C. hello packets
D. Routing tables received from neighbors
E. SAP packets sent by other routers
F. TTL packets from exclusive routers

8.单项选择题In a point-to point network, which address are OSPF hello packets sent to?()

A.127.0.0.1
B.192.168.0.5
C.223.0.0.1
D.172.16.0.1
E.224.0.0.5
F.254.255.255.255.255

9.单项选择题The Testking router is running both RIP and IGRP, and the same route is learned by this router from both of these methods. However, when you issue the command"show ip route" you see only the IGRP route, and not the RIP route. Why is this?()

A. IGRP has a faster update timer.
B. IGRP has a lower administrative distance.
C. RIP has a higher metric value for that route.
D. The IGRP route has fewer hops.
E. The RIP path has a routing loop.

10.单项选择题Which one of the following answer choices below is true regarding the OSPF topology database?()

A. All entries in the topology database will be included on each router.
B. All routers in the same OSPF area will have one topology database.
C. The Dijkstra algorithm is used in the creation of the topology database.
D. LSA packets are used to update and maintain the topology database.

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