Basic Question

Four Routers are connected end to end.The last router
on the right has a loopback interface configured.How
do I ping that Interface from the first router that is
on the left.

1.Configure a routing protocol.
2.Configure static routes
3.Configure default routes.
4.Any one of the above.

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Comments

aftereffector

You need to ping from one router, through another router, through a third router, to a fourth router. The ICMP packet will need some kind of route to know where to go. Do you think a static route would work for that? What about a routing protocol? Could default routes get the packet from one side of the network to the other and back?

d4nz1g

You need IP reachability for each loopback address.
Since all the 3 options provide this, the right answer should be "any of the above".

Heero

The default route answer doesn't really work since you would still need statics or a routing protocol for the return traffic. 1 and 2 should be the correct answers, with 1 being the best practice solution in almost all situations like this.

bharvey92

Answer 1 and 2 would be correct, however depending on the capability of the router you may want to configure static routing (due to overhead).

networker050184

What kind of over head would make you want to go with static routing instead?

Heero

A router with many OSPF adjacencies all running OSPF fast hellos with like a 20 multiplier or something? Or does he mean overhead on the link?

bharvey92

networker050184 wrote: »

What kind of over head would make you want to go with static routing instead?

Spot on Heero. An OSPF router with many adjacencies and many LSA types flowing through the device.

networker050184

That really isn't a concern in modern hardware unless you are doing something terribly, terribly wrong with your OSPF.

bharvey92

Always worth considering, you never know what hardware you are going to bump into on a customers site

satishtech

I tried all three options on packet tracer and all work.
THough adding a network in RIP is the easiest , just one step.