多項選擇題Which characteristics are representative of a link-state routing protocol?（）

A.provides common view of entire topology
B.exchanges routing tables with neighbors
C.calculates shortest path
D.utilizes event-triggered updates
E.utilizes frequent periodic updates


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1.單項選擇題What is the default administrative distance of OSPF?（）

A.120
B.100
C.90
D.110

2.單項選擇題

Refer to the exhibit. A network administrator configures a new router and enters the copy startup-config running-config on the router. The network administrator powers down the router and sets it up at a remote location. When the router starts, it enter the system configuration dialog as shown. What is the caust of the problem?（）

A.The network administrator faled to save the configuration.
B.The configuration register is set to 0x2100.
C.The boot system flash command is missing from the configuration.
D.The configuraiton register is set to 0x2102.
E.The router is configured with the boot system startup command.

3.多項選擇題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.

4.多項選擇題What information does a router running a link-state protocol use to build and maintain its topological database? （）

A.hello packets
B.SAP messages sent by other routers
C.LSAs from other routers
D.beacons received on point-to-point links
E.routing tables received from other link-state routers
F.TTL packets from designated routers

5.單項選擇題Which command can be a router to verify the layer 3 path to a host?（）

A.traceroute address
B.tracert address
C.ssh address
D.telnet address