1.Which of the following are true concerning distance vector and link state routing protocols? (Choose 2.)

　　A. Distance vector protocols send the entire routing table to directly connected neighbors.

　　B. Link state protocols send the entire routing table to all routers in the network.

　　C. Distance vector protocols send updates about directly connected neighbors to all networks listed in the routing table.

　　D. Link state protocols send updates containing the state of their own links to all other routers on the network.

　　Answer:AD

　　2.Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three.)

　　A. 15.234.118.63

　　B. 92.11.178.93

　　C. 134.178.18.56

　　D. 192.168.16.87

　　E. 201.45.116.159

　　F. 217.63.12.192

　　Answer:BCD

　　解释： 224 　11100000 3位表示网络， 5位代表主机

　　A. 15.234.118.63 　63 二进制为： 111111 为广播地址

　　B. 92.11.178.93 　93 二进制为： 1011101 可以使用

　　C. 134.178.18.56 　56 二进制为： 111000 可以使用

　　D. 192.168.16.87 　87 二进制为： 1010111 可以使用

　　E. 201.45.116.159 　159 二进制为：10011111 为广播地址

　　F. 217.63.12.192 　192 二进制为：11000000 代表网络

　　3.Refer to the graphic.