多项选择题
What are three characteristics of UDP?（）
A. UDP is faster than TCP B. UDP operates at the Transport Layer C. UDP is connection-oriented D. UDP data is sent best-effort E. UDP is more reliable than TCP
单项选择题 Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?（）
单项选择题 What is a valid IPv6 address?（）
单项选择题 What is the decimal equivalent of 00000100?（）
