1．Which of the following are key characteristics of PPP? (Choose three.)
A. can be used over analog circuits
B. maps Layer 2 to Layer 3 address
C. encapsulates several routed protocols
D. supports IP only
E. provides error correction
Answer: ACE
解释一下：PPP可以使用在虚链路上,是可以支持多种被路由的协议的，还可以提供错误修正。
2．The network administrator of the Oregon router adds the following command to the router configuration: ip route 192.168.12.0 255.255.255.0 172.16.12.1. What are the results of adding this command? (Choose two.)
[attach]***[/attach]
A. The command establishes a static route.
B. The command invokes a dynamic routing protocol for 192.168.12.0.
C. Traffic for network 192.168.12.0 is forwarded to 172.16.12.1.
D. Traffic for all networks is forwarded to 172.16.12.1.
E. This route is automatically propagated throughout the entire network.
F. Traffic for network 172.16.12.0 is forwarded to the 192.168.12.0 network.
Answer: AC
解释一下：ip route 192.168.12.0 255.255.255.0 172.16.12.1这句的意思是建立一条到达192.168.12.0/24的路由，出接口为172.168 .12.1,所以对于Oregon来说，以后发往192.168.12.0/24的路由都发送到172.16.12.1。
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