How to Access and Secure Cisco IOS on a Switch

You can access Cisco IOS on a switch locally through the console or remotely through a protected management connection. Use the console for initial setup and recovery, then configure SSH for normal remote administration.

Console Access

1. Connect the correct console cable or supported USB console connection.
2. Open a terminal program.
3. Select the correct serial or USB interface.
4. Use the platform’s documented settings; 9600 bits per second is common for serial console access.
5. Press Enter to display the prompt.

Basic Identification

Switch> enable
Switch# configure terminal
Switch(config)# hostname SW1

Choose a hostname that matches the organization’s naming standard.

Management Address

A Layer 2 switch can use a switched virtual interface for management. The VLAN must exist, and its Layer 2 path must be active. Use the correct address and prefix for your lab or production network.

SW1(config)# interface vlan 10
SW1(config-if)# ip address 192.0.2.10 255.255.255.0
SW1(config-if)# no shutdown

Use SSH Instead of Telnet

Telnet sends credentials and traffic without encryption. Configure SSH with a domain name, suitable key generation, local or centralized authentication, and VTY settings that allow SSH only.

Security Checklist

• Use unique administrator identities.
• Protect privileged access.
• Restrict management networks with ACLs.
• Disable unused services and interfaces.
• Configure time, logging, and backups.
• Verify changes before saving.

Useful Verification

• show ip interface brief
• show running-config
• show users
• show ssh

CCNA Practice

Use our CCNA questions and answers and the CCNA 200-301 Premium PDF with the latest available questions and answers.

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