單項選擇題How does route poisoning work with holddown timers to prevent routing loops?（）

A. Information learned from one source is not distributed back to that source.
B. Routing updates from the poisoned source are ignored until a holddown timer expires.
C. Failed routes are advertised with infinite metrics.
D. New routing updates are ignored until the network has converged.
E. A route is marked as unavailable when its time-to-live is exceeded.


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1.單項選擇題What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?（）

A. It routes all traffic that is addresses to the destination network to the interface indicates in the routing table.
B. It sends a copy of its neighbor table to all adjacent routers.
C. It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.
D. It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.

2.多項選擇題Which of the following describe the process identifier that is used to run OSPF on a router?（）

A. It is logically significant.
B. It is globally significant.
C. It is needed to identify a unique instance of an OSPF database.
D. It is an optional parameter required only if multiple OSPF processes are running on the router.
E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.

3.單項選擇題A router has EIGRP configured as the only routing protocol. How does EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?（）

A. It immediately sends its entire routing table to its neighbors.
B. EIGRP sends a Hello packet to the DR to inform it of the route failure.
C. It automatically forwards traffic to a fallback default route until a successor route is found.
D. It sends queries out to neighbors until a new successor route is found.
E. It places the route in holddown until LSA updates inform it of a new route to the network.

4.多項選擇題Which table of EIGRP route information are held in RAM and maintained through the use of hello and update packets?（）

A. Neighbor table
B. SPF table
C. RTP table
D. Topology table
E. Query table
F. DUAL table

5.多項選擇題Which statements are true regarding classless routing protocols?（）

A. The use of discontiguous subnets is not allowed
B. The use of variable length subnet masks is permitted
C. RIP v1 is a classless routing protocol
D. IGRP supports classless routing within the same autonomous system
E. RIP v2 supports classless routing