modull10-Basic Router Configuration

Study Notes

Basic Router Configuration

Device Naming: Assign a hostname to the router using Router(config)# hostname R1.
Privileged EXEC Mode Security: Secure privileged EXEC mode with Router(config)# enable secret.
User EXEC Mode Security (Console): Secure user EXEC mode (console) with Router(config)# line console 0, setting a password with Router(config-line)# password, and requiring login with Router(config-line)# login.
Remote Access Security (Telnet/SSH - vty lines): Secure remote Telnet/SSH access via vty lines (Router(config)# line vty 0 4) with password and login settings (Router(config-line)# password, Router(config-line)# login). Encrypt all plaintext passwords with Router(config)# service password-encryption. Enable SSH and telnet transport with Router(config-line)# transport input ssh telnet.
Legal Notice (Message of the Day): Provide a legal notification (banner motd) using Router(config)# banner motd # Unauthorized access is prohibited! #.
Configuration Saving: Save the running configuration to the startup configuration with Router# copy running-config startup-config.

Router Interface Configuration

Common Interfaces: Modern routers often feature GigabitEthernet ports like GigabitEthernet 0/0/0 and GigabitEthernet 0/0/1.
Interface Configuration Commands:
- Enter interface configuration mode with Router(config)# interface gigabitEthernet 0/0/0.
- Add a description (optional but recommended) with Router(config-if)# description.
- Assign an IPv4 address with Router(config-if)# ip address.
- Assign an IPv6 address with Router(config-if)# ipv6 address.
- Enable the interface with Router(config-if)# no shutdown.

Verification Commands

IPv4 Interface Summary: Use show ip interface brief to see IPv4 interface status and addresses.
IPv6 Interface Summary: Use show ipv6 interface brief for IPv6 interface summaries.
Routing Table: View routing table entries with show ip route (IPv4) and show ipv6 route (IPv6).
Interface Details: Get detailed information on interfaces (configuration, status, bandwidth, etc.) with show interfaces, show ip interface, or show ipv6 interface.

Default Gateway Configuration

Host Default Gateway: Establish a path to remote networks by configuring a default gateway, which is the router's local interface.
Switch Default Gateway (Layer 2):
- Configure a VLAN interface (usually VLAN 1 - SVI) with an IP address and default gateway:
  - Switch(config)# interface vlan 1
  - Switch(config-if)# ip address
  - Switch(config-if)# no shutdown
  - Switch(config)# ip default-gateway
- IPv6: Learns from the router's Router Advertisement (RA) or manually configured.

Study Tip

Maintain a specific order for router setup: hostname, secure modes, interface configuration, and correct default gateways on hosts/switches.
Thoroughly verify configuration using the provided verification commands before saving the configuration.
Consult the Cisco Networking Academy for additional details.

Description

This quiz covers essential commands for basic router configuration, including device naming, securing privileged EXEC mode, and managing remote access security. Test your knowledge on how to effectively set up and secure your router with various configurations such as passwords and legal notices.