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Junction with a tail 57 — RIP routing
Enterprise Intermediate 8 devices 4 checked tasks 49 points Plan lab
Scenario — Ranchi is a junction with no LAN: Nellore, Amritsar and the Aurangabad–Chennai tail all meet there. Every interface is already addressed. Your job is the routing: use RIPv2 so every office can reach every other. You build it in a browser, type real commands at each device, and every task below is
checked against the running configuration — so you find out it is wrong before anybody else does.
Open this lab in the simulator
The simulator runs in your browser with nothing to install. This lab is part of the full simulator: open it free for 7 days with a new account, then with a plan. It needs an account, which keeps your progress.
The scenario
Ranchi is a junction with no LAN: Nellore, Amritsar and the Aurangabad–Chennai tail all meet there. Every interface is already addressed. Your job is the routing: use RIPv2 so every office can reach every other.
Your role: a network engineer on the enterprise team. Level: Intermediate Done when: all 4 goals show as passed (49 points).
Network status
Devices: 5 routers, 3 PCs, cabled as drawn. No Layer 1 or Layer 2 faults: every link is connected and up. R-Nellore starts with addresses (G0/0 10.76.1.1/24, G0/1 172.24.56.1/30). PC-Nellore is a host with 10.76.1.10/24, gateway 10.76.1.1. R-Ranchi starts with addresses (G0/0 172.24.56.2/30, G0/1 172.24.56.5/30, G0/2 172.24.56.9/30). R-Amritsar starts with addresses (G0/0 10.76.2.1/24, G0/1 172.24.56.6/30). PC-Amritsar is a host with 10.76.2.10/24, gateway 10.76.2.1. R-Aurangabad starts with addresses (G0/0 172.24.56.10/30, G0/1 172.24.56.13/30). R-Chennai starts with addresses (G0/0 10.76.3.1/24, G0/1 172.24.56.14/30). PC-Chennai is a host with 10.76.3.10/24, gateway 10.76.3.1. Known problems
None: nothing is misconfigured. The routers are simply not finished: the goals list what has to be built. Goals
RIP is version 2 with no auto-summary on all 5 routers (15 pts) R-Nellore learns 10.76.3.0/24 from the protocol (10 pts) 10.76.1.10 (Nellore) reaches 10.76.3.10 (Chennai) (12 pts) 10.76.2.10 (Amritsar) reaches 10.76.1.10 (Nellore) (12 pts) The activity, in order
Enable RIPv2 on each router and advertise its LAN and links; keep LAN ports passive. Why: This is the task that checks your configuration directly: the line must really be there, not just look right. Verify with: show running-config Read the routing table of every router and compare it with the plan. Why: If the prefix is not in the routing table, the router drops packets for it, whatever else is configured. Verify with: show ip route Ping from each LAN to every other LAN, in both directions. Why: A ping needs a route in BOTH directions. This is the end-to-end proof that everything before it worked. Verify with: ping 10.76.3.10 Tips
Work in the order given: later goals depend on the earlier ones. After every change, run the verify command before moving on; do not guess. Stuck? Read the verify output first. It names the interface, neighbour or route that is wrong. Common mistake: Staying on version 1 (no masks) Common mistake: Forgetting no auto-summary Common mistake: Advertising only one of the classful networks in use Why this matters
RIP counts hops and repeats its whole table every thirty seconds. It is simple and old, and still examined because it shows distance-vector behaviour in its plainest form; version 2 carries masks, version 1 does not.
What you will be able to do
Enable RIPv2 with classful network statements
Turn off automatic summarisation
Spot a link network that is not advertised
The network
ISR 2911, PC — 8 devices in all, already cabled.
Fa0 Gi0/0 10.76.1.1/24 Fa0 Gi0/0 10.76.2.1/24 Fa0 Gi0/0 10.76.3.1/24 Gi0/1 172.24.56.1/30 Gi0/0 172.24.56.2/30 Gi0/1 172.24.56.5/30 Gi0/1 172.24.56.6/30 Gi0/2 172.24.56.9/30 Gi0/0 172.24.56.10/30 Gi0/1 172.24.56.13/30 Gi0/1 172.24.56.14/30 R-Nellore PC-Nellore 10.76.1.10/24 · gw 10.76.1.1 R-Ranchi R-Amritsar PC-Amritsar 10.76.2.10/24 · gw 10.76.2.1 R-Aurangabad R-Chennai PC-Chennai 10.76.3.10/24 · gw 10.76.3.1 Drawn from this lab: devices, cables, ports and the addresses already set. Device Model Address already set
R-Nellore ISR 2911 configure it PC-Nellore PC 10.76.1.10 / 255.255.255.0 gw 10.76.1.1 R-Ranchi ISR 2911 configure it R-Amritsar ISR 2911 configure it PC-Amritsar PC 10.76.2.10 / 255.255.255.0 gw 10.76.2.1 R-Aurangabad ISR 2911 configure it R-Chennai ISR 2911 configure it PC-Chennai PC 10.76.3.10 / 255.255.255.0 gw 10.76.3.1
Cabling
PC-Nellore Fa0 ↔ R-Nellore Gi0/0 PC-Amritsar Fa0 ↔ R-Amritsar Gi0/0 PC-Chennai Fa0 ↔ R-Chennai Gi0/0 R-Nellore Gi0/1 ↔ R-Ranchi Gi0/0 R-Ranchi Gi0/1 ↔ R-Amritsar Gi0/1 R-Ranchi Gi0/2 ↔ R-Aurangabad Gi0/0 R-Aurangabad Gi0/1 ↔ R-Chennai Gi0/1
What is configured at the start
These are already configured when the lab opens — including, where this is a troubleshooting lab, the fault itself:
R-Nellore interface g0/0
ip address 10.76.1.1 255.255.255.0
no shutdown
exit
interface g0/1
ip address 172.24.56.1 255.255.255.252
no shutdown
exit R-Ranchi interface g0/0
ip address 172.24.56.2 255.255.255.252
no shutdown
exit
interface g0/1
ip address 172.24.56.5 255.255.255.252
no shutdown
exit
interface g0/2
ip address 172.24.56.9 255.255.255.252
no shutdown
exit R-Amritsar interface g0/0
ip address 10.76.2.1 255.255.255.0
no shutdown
exit
interface g0/1
ip address 172.24.56.6 255.255.255.252
no shutdown
exit R-Aurangabad interface g0/0
ip address 172.24.56.10 255.255.255.252
no shutdown
exit
interface g0/1
ip address 172.24.56.13 255.255.255.252
no shutdown
exit R-Chennai interface g0/0
ip address 10.76.3.1 255.255.255.0
no shutdown
exit
interface g0/1
ip address 172.24.56.14 255.255.255.252
no shutdown
exit Tasks, and how each one is checked
Every task is decided by reading the live network — a neighbour in FULL, a ping that succeeds, a line in the running configuration — not by looking for a keyword you typed. The same command shows you what the lab sees.
# Task Pts How to verify it yourself
1 RIP is version 2 with no auto-summary on all 5 routers 15 On R-Nellore: show running-config contains the line(s) matching router rip[\s\S]*version 2[\s\S]*no auto-summary. and On R-Ranchi: show running-config contains the line(s) matching router rip[\s\S]*version 2[\s\S]*no auto-summary. and On R-Amritsar: show running-config contains the line(s) matching router rip[\s\S]*version 2[\s\S]*no auto-summary. and On R-Aurangabad: show running-config contains the line(s) matching router rip[\s\S]*version 2[\s\S]*no auto-summary. and On R-Chennai: show running-config contains the line(s) matching router rip[\s\S]*version 2[\s\S]*no auto-summary. 2 R-Nellore learns 10.76.3.0/24 from the protocol 10 On R-Nellore: show ip route lists 10.76.3.0/24. 3 10.76.1.10 (Nellore) reaches 10.76.3.10 (Chennai) 12 On PC-Nellore: ping 10.76.3.10 must succeed. 4 10.76.2.10 (Amritsar) reaches 10.76.1.10 (Nellore) 12 On PC-Amritsar: ping 10.76.1.10 must succeed.
Stuck? Ask the coach
Tell the coach what you see or what you tried. It gives you a hint, not the answer, the way a senior engineer would. Included with a free trial or any plan.
Ask the coach
Common mistakes
Staying on version 1 (no masks)
Forgetting no auto-summary
Advertising only one of the classful networks in use
Reference solution
Try it yourself first — the lab checks your work either way. This is one configuration that makes every task pass, device by device:
R-Nellore router rip
version 2
no auto-summary
network 10.0.0.0
network 172.24.0.0
passive-interface GigabitEthernet0/0
exit R-Ranchi router rip
version 2
no auto-summary
network 10.0.0.0
network 172.24.0.0
exit R-Amritsar router rip
version 2
no auto-summary
network 10.0.0.0
network 172.24.0.0
passive-interface GigabitEthernet0/0
exit R-Aurangabad router rip
version 2
no auto-summary
network 10.0.0.0
network 172.24.0.0
exit R-Chennai router rip
version 2
no auto-summary
network 10.0.0.0
network 172.24.0.0
passive-interface GigabitEthernet0/0
exit Where this is examined
CCNA 3.0 routing fundamentals; Network+ 2.1 dynamic routing.
This lab practises these topics in the zNetLaB certification courses:
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