判断题

RIP协议引入路由保持机制的作用是防止路由形成环路。

【参考答案】

正确

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单项选择题

While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

A.the session layer
B.the protocol layer
C.the data link layer
D.the access layer
E.the network layer
F.the application layer

多项选择题

Which statements describe the routing protocol OSPF? （）

A.It supports VLSM.
B.It is used to route between autonomous systems.
C.It confines network instability to one area of the network.
D.It increases routing overhead on the network.
E.It allows extensive control of routing updates.
F.It is simpler to configure than RIP v2.

多项选择题

Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true (Choose two.)（）。

A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached
D.Router C will send a Destination Unreachable message type
E.Router C will send a Router Selection message type
F.Router C will send a Source Quench message type