问题
单项选择题
TCP (Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n)（）.
A．IP address
B．reliable network
C．socket
D．unreliable internet work
答案
参考答案：D
解析：
本题的含义是，TCP被设计用于在不可靠的互联网上提供可靠的端对端，选择答案D正确。