This document discusses LAN switching and wireless VLANs over 8 lectures taught by instructor Mazhar Jamil. It covers basic Ethernet and switching concepts, including how communications occur in switched LAN networks via unicast to a single host, broadcast to all hosts on the LAN, and multicast to a group of hosts for applications like video conferencing. Ethernet signals on half-duplex hubs use CSMA/CD rules for network access, whereas switched networks support full-duplex communication.

1. LAN SWITCHING & WIRELESS
VLANs
CHAPTER 3
Lect # : 1,2,3,4,5,6,7,8
Instructor: Mazhar
Jamil

2. BASIC ETHERNET AND SWITCHING
CONCEPTS EXERCISE
• Ethernet signals are transmitted to every host connected to the LAN using a
special set of rules called (CSMA/CD) to determine which station can access the
network.
• These rules are only used with half-duplex communication typically found in hubs.
• Ethernet communications in a switched LAN network occur in three ways:
• Unicast communication: E.g. HTTP
, SMTP
, FTP
, and Telnet.
• Broadcast communication: E.g. ARP sends to all computers on a LAN.
• Multicast communication: E.g. collaborative business meeting.(Video/ voice)