multiple choice
big question
3-0-8 (required)
Principle of CSMA/CDX protocol
1. Listen first and then send
2. Listen while sending
3. Stop the conflict
4. Resend immediately
3-20
fill in the blank
1. Three basic problems of the data link layer
Encapsulation into frames, transparent transmission, error detection
2. What are the top structures of the LAN, and the most popular topological structure now
Star, bus, and ring.
Now it is popular star. (Star node is easy to expand)
Early popular bus. (Bus is relatively simple in the early days, but it is not easy to expand)
judgment
LAN uses broadcast communication, while WAN does not.