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Chapter 12: Initial Switch Conﬁguration

CERTIFICATION SUMMARY

This chapter focused on basic configuration tasks specific to Cisco Catalyst switches.

The 2960 switches were introduced, including the meaning of their LEDs and the

use of the MODE button. When a switch boots up, it runs POST, loads the IOS,

and then loads its configuration. If the IOS can't find a configuration file, it runs the

System Configuration Dialog.

To manage the switch remotely, minimally it will need an IP address associated

with a VLAN (interface vlan and ip address) and a default gateway

address (ip default-gateway). To view the MAC addresses the switch learns,

use the show mac-address-table command.

Port security can be used to prevent unauthorized access to a LAN. Addresses

can be learned dynamically (not saved), using sticky learning (saved), or statically

configured. A violation occurs when more MAC addresses are off of an interface

than are specified or when a MAC address is seen off of a different interface than

expected. Violation modes are restrict, protect, and shutdown. Port security can

be configured only on access (non-trunk) ports with the switchport port-

security commands.