Router
Nerd Cafe
Function:
Layer 3 device that makes forwarding decisions based on logical network addresses (e.g., IP addresses).
Key Features:
Segments networks by not forwarding broadcast packets by default, creating separate broadcast domains per port.
Each port also creates a separate collision domain, enhancing network efficiency.
Supports advanced features like QoS for traffic prioritization.
Topology
Summary Table of IP Assignments
Router
fa0/0
192.168.1.1
192.168.1.0/24
Router
fa0/1
192.168.2.1
192.168.2.0/24
PC0
NIC
192.168.1.10
192.168.1.0/24
PC1
NIC
192.168.1.11
192.168.1.0/24
PC2
NIC
192.168.2.10
192.168.2.0/24
PC3
NIC
192.168.2.11
192.168.2.0/24
Configure the Router Interfaces
Router>enable
Router#configure terminal
Router(config)#interface fastEthernet 0/0
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#no shutdown
Router(config-if)#exit
Router(config)#interface fastEthernet 0/1
Router(config-if)#ip address 192.168.2.1 255.255.255.0
Router(config-if)#no shutdown
Router(config-if)#^Z
Router#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
Router#Test Connectivity
On a PC, open Command Prompt → ping the other subnet:
PC>ping 192.168.2.10
Pinging 192.168.2.10 with 32 bytes of data:
Reply from 192.168.2.10: bytes=32 time=0ms TTL=127
Reply from 192.168.2.10: bytes=32 time=0ms TTL=127
Reply from 192.168.2.10: bytes=32 time=0ms TTL=127
Reply from 192.168.2.10: bytes=32 time=0ms TTL=127
Ping statistics for 192.168.2.10:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
PC>Congratulations!
You have built a two-subnet, router-on-a-stick-style topology in Packet Tracer, perfect for practicing basic routing between LANs.
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