IPv4协议支持16位的端口，（51）属于动态端口。
- A.1024～49151
- B.49152～65535
- C.49151～65535
- D.0～65535
正确答案及解析
正确答案
解析
IPv4协议支持16位的端口，端口号可使用的范围是0～65535。
0～1023端口称为熟知端口，这些端口给特定服务使用，由IANA管理。
1024～49151叫做注册端口，一般用于客户端连接时随机选择。
49152～65535端口叫做动态端口或专用端口，提供给专用应用程序。
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