1. [多选题]网络中经常使用DDN服务，请选出DDN的优点（）
A. 传输质量高
B. 接入方式灵活
C. 偷占带宽
D. 使用虚电路
E. 专用线路
2. [单选题]查看E0端口配置信息的命令是：()
A. show access-list
B. show ip route
C. show version
D. show interfacee0
3. [单选题]常见的LSA有几种类型()
A. 4
B. 5
C. 6
D. 7
4. [单选题]能够分配给设备的IP，应该是（）
A. 网络有效IP
B. 网络号
C. 网络广播地址
D. 任意IP
5. [多选题]What are two characteristics of "store and forward" switching? (Select two answer choices)
A. Latency fluctuates regardless of frame. size.
B. The switch receives the complete frame. before beginning to forward it.
C. Latency through the switch varies with frame. length.
D. The switch checks the destination address upon receipt of headers.
