CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

RTA have a default route. ISP cannot ping any of the addresses inside the 192.168.1.0/24
address space because it does not have a route. RTA needs a default route pointing to ISP, and
ISP needs a static route pointing to the 192.168.1.0/24 address space.
Task 5: Configure Static and Default Routing
Step 1. For ISP to be able to send Echo replies back to hosts belonging to the 192.168.1.0/24 address
space, it must have a route. Use the following command on ISP to configure a static route
pointing to the 192.168.1.0/24 address space:
ISP(config)#ip route 192.168.1.0 255.255.255.0 209.165.201.2
Step 2. Now ISP can route back to any host belonging to 192.168.1.0/24. However, RTA, RTB, and
RTC do not yet have a route for any address space other than 192.168.1.0/24. Because ISP represents
the connection to the rest of the world, you need to configure default routing. A router
without a more specific route in the routing table will send traffic to the default route. Use the
following command on RTA to configure a default route:
RTA(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1
Step 3. If you are simulating ISP, use the following command to configure a default route:
RTA(config)#ip route 0.0.0.0 0.0.0.0 Loopback0
Step 4. Now RTA should be able to ping the Public Web Server. However, RTB and RTC still cannot
ping outside the 192.168.1.0/24 address space. The reason is that RTA does not advertise the
default route unless specifically configured to do so. Use the following command with RIP to
propagate a default route to RTB and RTC in the RIP updates:
RTA(config)#router rip
RTA(config-router)#default-information originate
Note: With RIP routing, depending on the platform and IOS version, you may need to reload the router that is propagating
the default route before the default route will be sent in routing updates.
Task 6: Verify Connectivity and Capture Scripts
Chapter 1: Introduction to Classless Routing 77
Step 1. Verify that all routers now have a default route and can ping the Public Web Server.
Note: If you are simulating ISP, test by pinging the loopback interface, 209.165.201.2 on RTA.
RTA>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 209.165.201.1 to network 0.0.0.0
209.165.201.0/30 is subnetted, 1 subnets
C 209.165.201.0 is directly connected, Serial1/0
192.168.1.0/24 is variably subnetted, 6 subnets, 2 masks