Junos Cup 2014
Junos Cup 2014

Tournament 4: Algeria Challenge & Solution: One-Hop Ping

[ Edited ]
‎07-03-2014 07:10 AM

Country Flag: ALGERIA

 

Author: Antonio Sánchez-Monge

 

Title: One-Hop Ping

 

Type: Enterprise

 

Difficulty: Medium (1 point).

 

Technical Description: Figure out why a ping from R1 to R2 is failing, and propose a way to fix the configuration.

 

Topology:

 

Algeria-Topology

 

For this challenge, you need to start the topology called: “ALGERIA – One-Hop Ping”.

 

Challenge Instructions:

In the Junosphere topology a plain one-hop ping from R1 to R2 is failing:

 

juniper@R1> ping 10.1.1.2

PING 10.1.1.2 (10.1.1.2): 56 data bytes

^C

--- 10.1.1.2 ping statistics ---

1 packets transmitted, 0 packets received, 100% packet loss

 

 

You need to troubleshoot it. What is causing this ping to fail, and what in R1’s or R2’s configuration is triggering this behavior?

 

Although you actually don’t have access to the configuration, imagine for a moment that you were allowed to execute this procedure in either R1 or R2:

 

configure

<command>

commit and-quit

 

As a result:

-       You would not change the IP addressing.

-       You would make the plain ping above work, without any ping options.

 

To solve this challenge, what is the <command> and on which router would you execute the procedure?

 

Suggested reading: Chapter 2 of: https://www.juniper.net/us/en/community/junos/training-certification/day-one/networking-technologies...

 

 

NOTE: If you have issues connecting to the Junosphere topology please check Junosphere Technical documentation, or request assistance in the Junosphere forum 

 

OFFICIAL SOLUTION:

 

At R1:

 

configure

delete system default-address-selection

commit and-quit


 

Julie Wider
Advocacy Manager
Twitter: @JNetCommunity & @jawider