Switch and End Device Basics

Definition of a network switch

• A device that connects devices in a LAN and forwards data based on MAC addresses

• A device that connects multiple networks and routes data between them

• A device that amplifies signals in a network

• A device that provides wireless connectivity to devices

Steps to secure switch access

• Use default passwords

• Enable Telnet access

• Enable SSH, disable unused ports

• Keep all ports open

Command to enter global configuration mode

• config terminal

• global config

• enter config mode

• set config

Verifying switch port status

• show interfaces brief

• show port status

• display interface summary

• check switch port

Setting a password for console access

• line console 0
  password [password]
  login

• interface console 0
  set password [password]
  enable

• line con 0
  password [password]
  authenticate

• console line 0
  password [password]
  access

Assigning a hostname to a switch

• [name]

• [device]

• [router]

• [host]

Assigning a static IP to a PC

• IP address

• subnet mask

• default gateway

• DNS server

Planning IP addressing for end devices

• unique IPs

• avoid conflicts

• match subnet

• use default IPs

Planning switch hostname conventions

• location, function, and number (e.g., SW-Admin-01)

• location and type

• function and model

• number and brand

Evaluating switch configuration for errors

• show commands, verify settings, test connectivity

• check power supply, reboot device, update firmware

• replace hardware, reset to factory settings, run diagnostics

• configure VLANs, set up routing protocols, monitor traffic