CST 311 - Intro to Computer Networks - Week 7

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This week in CST-311, we learned about the Link Layer in networking, which is the interface between the physical transmission of data and higher level protocols. Understanding the basics of the link layer and its importance in facilitating reliable communication between directly connected nodes. Then we learned about error detection and correction techniques, including parity checks, checksums, and cyclic redundancy checks (CRC), which are essential in ensuring data integrity across unreliable transmission media. Also, we learned about multiple access links and protocols, such as ALOHA, CSMA/CD, and CSMA/CA, which manage how multiple devices share a single communication channel and avoid collisions.


This week also introduced us to switched local area networks (LANs), specifically link layer addressing and the Address Resolution Protocol (ARP). We covered how ARP resolves IP addresses to MAC addresses within a local network, enabling communication at the link layer. Additionally, we explored Ethernet, the dominant LAN technology, learning about its frame structure, transmission protocols, and physical mediums. This week concluded with an overview of link layer switches, which play a critical role in LANs by forwarding data frames based on MAC addresses and helping create more efficient, scalable networks.

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