相比于TCP，UDP的优势为（ ）。
- A.可靠传输
- B.开销较小
- C.拥塞控制
- D.流量控制
正确答案及解析
正确答案
解析
TCP与UDP区别：1、TCP面向连接（如打电话要先拨号建立连接）；UDP是无连接的，即发送数据之前不需要建立连接；2、TCP提供可靠的服务。也就是说，通过TCP连接传送的数据，无差错，不丢失，不重复，且按序到达；UDP尽最大努力交付，即不保证可靠交付；3、TCP面向字节流，实际上是TCP把数据看成一连串无结构的字节流；UDP是面向报文的；UDP没有拥塞控制，因此网络出现拥塞不会使源主机的发送速率降低（对实时应用很有用，如IP电话，实时视频会议等）；4、每一条TCP连接只能是点到点的；UDP支持一对一，一对多，多对一和多对多的交互通信；5、TCP首部开销20字节；UDP的首部开销小，只有8个字节；6、TCP的逻辑通信信道是全双工的可靠信道，UDP则是不可靠信道，整体来看UDP开销较小。
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