1. Please write down the pseudo-code for CSMA/CD algorithm

2. Why does CSMA/CD use a random delay?

3. What is the hidden terminal problem? What is the exposed terminal problem?

4. Please write down the pseudo-code for CSMA/CA algorithm

5. Why do we need byte stuffing?

6. Modify the client.c and server.c program from Assignment 1 to add the following function: when the client connects to the server, the client provides the name of a directory D to be retrieved in the server; When the server receives the request, the server reads the name of the directory D, retrieves the contents from the directory D, and sends the contents back to the client. The client, after receiving the contents from the server, prints out the content. Hint:

1. Use opendir() to open a directory; use man opendir to check more details;

2. Use readdir() to read contents under a directory: use man

3 readdir to check moredetails3. Use closedir() to close a directory