In the first section of this guide, we discussed network monitoring and maintenance functions, as well as troubleshooting methodologies and processes from a theoretical standpoint. The following sections in this guide will discuss troubleshooting from a practical perspective. This chapter focuses on troubleshooting Cisco Catalyst switch Layer 1 and Layer 2 issues. The TSHOOT certification exam objectives that are covered in this chapter include the following:
- Troubleshoot switch-to-switch connectivity for the VLAN based solution
- Troubleshoot loop prevention for the VLAN based solution
LAN switching is a form of packet switching that is used in Local Area Networks (LANs). LAN switching is performed in hardware at the Data Link layer. Because LAN switching is hardware-based, it uses hardware addresses that are referred to as Media Access Control (MAC) addresses. The MAC addresses are then used by LAN switches to forward frames. This chapter will be divided in the following sections: