C. 超时报文
D. 目的不可达报文
Answer: A
14.V.35在同步工作模式下最大传输速率是
A.64Kbps
B.9200bps
C.56kbps
D.2048kbps
Answer:D
15.VLSM的含义是
A.VariableLengthSubnetMasking
B.VariableLengthShortestMasking
C.VeryLong/ShortestMasking
D.VariableLongSubnetMasking
Answer: A
16.IP地址192.168.1.7/28的子网掩码为（ ）
A.255.255.255.240
B.255.255.255.248
C.255.255.255.224
D.255.255.255.252
Answer: A
17.D类IP地址的缺省子网掩码有（ ）位
A.8
B.16
C.24
D. 没有子网掩码
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