在TCP／IP网络中，为各种公共服务保留的端口号范围是()。
- A.1～255
- B.256～1023
- C.1～1023
- D.1024～65535
正确答案及解析
正确答案
解析
端口号是传输层的服务访问点。在TCP和UDP报文中，端口号字段占16位，所以它的取值范围是0～-65535。常用的公共服务占用的端口号是1～1023，端口1024保留，其他专用协议在1025～65535中选用端口号。
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