單項(xiàng)選擇題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.


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1.單項(xiàng)選擇題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

2.多項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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.

5.單項(xiàng)選擇題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.