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Originally posted by cnet_designer
While i am preparing for my routing exam, i have found a collection of study guides that i am studying from currently as the last step before doing the exam : )... i have encountered many questions that i wasn't convinced with their answers, i need your help in them:

1-Why IS-IS level 3 routing is not supported in cisco routers?
They rely on BGP, external routing protocol to accomplish the inter-company domain-to-domain routing
2-What configuration must the ABR have that are not required on internal area routers?
(they are saying virtual link - but i see that it is no-summary) what do you think?
Technically true, but only if there is a need for a virtual link. Also the ABR must have two interfaces in two different areas, while the Internal must have all ints in one ares. No-summary is also a good guess, but only with reference to Totally-Stubby areas.

3-Router bgp 500
redistribute static
ip route 164.20.0.0 255.255.0.0 null 0

What is true about the configuration?
they are saying (cisco prefers the you use the aggregate-address command to distribute IGP routes into BGP) what do you think?
Remember, on ALL Cisco exams, the Cisco prefered way is the "right" way.
4-to check if a particular router is a route reflector or not, which command should you use?
they are saying show bgp neighbor
i say show running config
what do you think?
The show bgp neighbor output specifically states that the device is a route reflector if configured as such. While show running-config will also indicate when you see the bgp config, see my response to #3.

Thank you all for your help : )

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