Packet Tracer setup and Cisco IOS command modes

Cisco Packet Tracer lets you practise with simulated networking devices. Install it using Cisco’s instructions, then open a new file.

1. Place your devices

   Add two PCs and one switch to your workspace.

2. Connect the network

   Connect each PC to a switch Ethernet port using the appropriate copper connection.

3. Give each PC an address

   Open each PC’s IP configuration and enter the settings below.

Device models, menus and supported commands vary by version. A simulator is useful practice, but it does not reproduce every behaviour of a real network.

The characters before your cursor tell you which mode you’re in. The same command may work in one mode and be unavailable in another.

Cisco IOS mode transitions

Open the switch’s CLI. Press Enter if needed, then type the commands after each prompt.

Switch> enable


Switch# configure terminal


Enter configuration commands, one per line. End with CNTL/Z.


Switch(config)# end


Switch# show version

On PC 1, open Desktop → Command Prompt. Test whether you can reach PC 2.

C:\> ping 192.168.10.20

1. Observe: Allow address learning to settle, then repeat the ping. Record the result.
2. Break the path: Disconnect one cable and ping again. What changed?
3. Investigate: Reconnect the cable, generate traffic, and inspect the switch’s learned addresses.

Switch# show mac address-table