Connect & Configure Cisco Networking Devices: Part 2

Table of Contents

1. Main Menu
2. Part 2: Basic Switch Operation and Configuration
3. 2.1: LAN Switching
4. LAN Switching Continued
5. 2.2: Basic Configuration Commands
6. 2.2.1: Privilege Exec Mode Commands
7. 2.2.1: Global Configuration Mode Commands
8. 2.2.3: Line Mode Commands
9. 2.3: Displaying the contents of the MAC Address Table
10. 2.4: Switch Interfaces
11. Switch Interface Configuration Continued
12. 2.5: Assigning an IP Address & Default Gateway to a 2950 Switch
13. 2.6: Configuring Port Security
14. Video: Basic Switch and Port Security Configuration
15. 2.7: The Spanning Tree Protocol (STP)
16. 2.7.2: STP Port States
17. 2.7.3: STP Configuration
18. Review Questions for Part 2

2.1: LAN Switching

LAN Switching was introduced in our INTRO CCNA Course E509, the following section reviews this area

An Ethernet Switch functions in the same way as a Bridge but typically has more ports. The Switch essentially performs bridging, but this is done via hardware using an Application Specific Integrated Circuit (ASIC), with a high-capacity switching bus making a Switch much faster than a bridge

Each Port on an Ethernet Switch can be connected to a single user or to a shared segment that serves many users.

Both Bridges and Switches reside at the Data Link layer of the OSI Model (Layer 2) and use Media Access Control (MAC) addresses to identify devices and forward or filter frames of information

Basic Switch and Bridge forwarding logic is:

1. The frame is received

2. If the destination MAC address is a BROADCAST (FFFF.FFFF.FFFF in hexadecimal notation) or MULTICAST then it is forwarded to ALL ports EXCEPT to the port that it was received on

3. If the destination MAC address is a UNICAST and exists in the address table, the frame is forwarded out to the correct port

4. Otherwise the frame is filtered and NOT forwarded