第二章单元测试
- TCP is an application layer protocol.
- Which is not an application layer protocol? ( )
- The only architecture of applications is peer-to-peer.
- In the client-server architecture, the clients is not always on.
- Mail server port number is ( )
A:对 B:错
答案:错
A:DNS B:ARP C:FTP D:HTTP
A:对 B:错
A:对 B:错
A:80 B:403 C:25 D:81
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