单项选择题
Why is IPv6 packet processing more effective than IPv4 packet processing?（）
A. fixed header size B. smaller header size C. fewer header fields D. variable header size
单项选择题 Which layer in the TCP/IP model is responsible for delivering packets to their destination?（）
单项选择题 Which layer in the OSI model is responsible for translating frames into bits?（）
多项选择题 What are three characteristics of UDP?（）
