在TCP/IP 协议簇中，UDP 协议工作在（）。
- A.应用层
- B.传输层
- C.网络互联层
- D.网络接口层
正确答案及解析
正确答案
解析
UDP即用户数据报协议，是一个无连接服务的协议。它提供多路复用和差错检测功能，但不保证数据的正确传送和重复出现。UDP报头包括16位的源和目的端口号，16位的以字节为单位的长度总和（数据和报头的和）标识字段，16位的数据和报头校验和字段。基于UDP的应用层协议：SNMP、DNS、TFTP、DHCP、RPC等。
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