CST311 - Week 38

This week, we covered Chapter 6: The Link Layer and LANs in the textbook. The chapter discussed different types of link-layer protocols such as channel partitioning protocols like TDM and FDM, random access protocol such as ALOHA, and taking-turns protocols. Every adapter of a host/router has a link-layer address called a MAC address. ARP, Address Resolution Protocol, translates IP address to the correct MAC address within a subnet. An ARP query is broadcasted to every node in a subnet, and the matching destination sends an ARP reply with the correct mapping which is then stored in the local ARP table of the querying node. The book then discussed the differences and pros and cons of switches and routers. After reading about the link-layer, the textbook completed the entire protocol stack and the last section gives a full explanation of "A Day in the Life of a Web Page Request," which goes through the entire process including protocols from each of the layers.

In Lab 11, we examined a Wireshark capture and focused on the Ethernet frames. We detected IP and MAC addresses and ARP queries and replies. Additionally, our group began working on Programming Assignment #4, Subnet Addressing and Routing in Mininet. We each designed the network and labeled each interface and link and met to discuss our next steps.

This is the last full week of class! In the next few days, I will begin studying for the final exam and the class will be over this Friday. I hope the final goes well!