Having just exited a three day Global Knowledge class on BGP, let's see if
anything sunk through this thick skull of mine. Comments in line.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Peter Abraham
Sent: Thursday, September 14, 2000 2:02 PM
To: [EMAIL PROTECTED]
Subject: BGP **** CCO QUESTION ** PA
All these are questions that I got from the CCO BCSN tests.
1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
A. network 10.1.0.0
B. network 10.1.0.0 255.255.0.0
C. network 10.1.0.0 mask 255.255.0.0
D. network 10.1.0.0/16
E. network 10.1.0.0 prefix 16
I have my answer as A. B,D, and E all have the wrong syntax. Is C right? I
know that the mask length for C is 16.
CL: all are wrong with regards to producing the desired result. A) will
place the network 10.1.0.0 into the BGP process with a mask based on the
interface configuration. If the interface were a /8 or a /16 or a /17, the
particular subnet would be advertised. B) syntax is wrong, as is the syntax
of D) and E) Answer C) will place network 10.1.0.0/16 ( 255.255.0.0 0 into
the process.
Well- A would be correct if the interface were a /24 interface.
2. What is the function of the BGP atomic aggregate attribute?
A. To indicate that the originating router has aggregated the routes
B. To specify the BGP router ID and AS number of the router that performed
the route aggregation
C. To specify the AS number of the router that performed the route
aggregation
D. To specify the AS number of the router that performed the route
aggregation and the AS numbers of the non-aggregated routes
Answer: A.
I have searched the CISCO web site and cannot find information on BGP atomic
aggregate attribute.
CL: this answer is not correct, based upon my understanding of the attribute
( albeit beginner's understanding ) The atomic aggregate attribute tells the
downstream that as a result of aggregation, some information or other
regarding attributes of some or all of the aggregated subnets is lost.
Hmmmmmm..... I'm looking at what the RFC ( 1771 ) says. This appears to be
a bit different than what I recall from class. Quote: "If a BGP speaker ,
when presented with a set of overlapping routes from one of it's
peers...selects the less specific route without selecting the more specific
one, then the local system shall attach the ATOMIC_AGGREGATE attribute to
the route when propagating it to other BGP speakers....."
That makes "A" the correct answer. Guess some things didn't sink through.
Finally, how do prefix lists have support for incremental updates? Does
anyone have a simple explanation for this?
I appreciate your assistance.
Peter.
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