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1 - Basic setup



1.1 Introduction

This lab introduces the basic configuration of a simple network in GNS3.
The goal is to connect a router, a switch, and two PCs, assign IP addresses, and verify connectivity within the same subnet.
The exercise demonstrates how devices are connected and how basic communication between them is established.

TOPOLOGY-map-1



1.2 Topology

Device Hostname Interface IP Address Subnet Mask Gateway
Router R1 Gi0/0 192.168.1.1 255.255.255.0 –
Switch SW1 Gi0/0 – – –
PC1 PC1 Eth0 192.168.1.10 255.255.255.0 192.168.1.1
PC2 PC2 Eth0 192.168.1.11 255.255.255.0 192.168.1.1



1.3 Steps

  1. Set hostname and IP address on the router

    • Assign hostname R1.

    • Configure IP address on Gi0/0 interface.

    • Enable the interface

    • Set ip address and mask (192.168.1.1 255.255.255.0)

  2. Set hostname on the switch

    • Assign hostname SW1.

    • No IP address or VLAN configuration is needed for this lab.

  3. Configure PCs (VPCS1 and VPCS2)

    • Set IP addresses and default gateway.

    • Gateway is the router’s IP (192.168.1.1).

    • Testing ping PCs -> R1



1.4 Configuration in CLI

Router (R1)

enable
configure terminal
hostname R1
interface Gi0/0
ip address 192.168.1.1 255.255.255.0
no shutdown
end
write memory

R1-IP

Switch (SW1)

enable
configure terminal
hostname SW1
exit
write memory

SW1-hostname

PC1 (VPCS1)

ip 192.168.1.10 255.255.255.0 192.168.1.1
save

PC1-IP-PING

PC2 (VPCS2)

ip 192.168.1.11 255.255.255.0 192.168.1.1
save

PC2-IP-PING



1.5 Diagnostics on Router (R1)

  1. Verify interface status with show ip interface brief.

    • Check assigned IP address on Gi0/0.

    • Confirm that the interface is up/up.

  2. Test connectivity to PCs.

    • ping 192.168.1.10 / 192.168.1.11

    • Verify 100% success rate.

R1#show ip interface brief
R1#ping 192.168.1.10
R1#ping 192.168.1.11

R1-DIAGNOSTIC



1.6 Conclusion

This lab successfully demonstrated the configuration of a basic network in GNS3.
A single router, switch, and two PCs were connected, configured, and tested.

The router was assigned an IP address, the switch received a hostname, and both PCs were configured with IP addresses and a default gateway.

Connectivity was verified using the ping command, confirming that all devices are able to communicate within the same subnet.

This basic setup provides a solid foundation for more advanced labs, where additional features such as secure access, SSH, and the integration of a QEMU Xubuntu client will be introduced.

Next part: Secure access