The MPLS-OPS Archive

[Roger Clark Williams <rogerw@nordlink.com>]

Aita, I will take a shot at answering the questions (and probably get a few 
wrong), but if, as you say, you don't understand the meaning of the 
question, you need to find out what it means, not just the answer.

Also, if you are going for the Cisco MPLS test, you have to look at shades 
of meaning, you have to read very carefully. Note the first question: Is 
the question about MPLS specifically, or QoS overall? If the question is 
being asked about MPLS, then answers #2 and #3 would be better answers than 
#1 and #4. Be aware that both #1 and #4 are valid answers to questions 
similar to the one being asked, but not to the specific question being 
asked, assuming it is about MPLS. You have to be very careful in taking the 
test to read the question fully, not jump to a conclusion on what is being 
asked before you have finished reading it. Also, if you don't know the 
answer for sure, try to eliminate what you know to be wrong before guessing 
at what might be right.

I will put asterisks below beside what I think are correct answers, but as 
I say, I will probably get some wrong (and probably hear from everyone on 
the list about it - I never said I was perfect!), and I trust others will 
correct me where I am wrong. If you have further questions about what is 
being asked, send them on to the list. Other people reading will be interested.

Roger Williams


>Resent-Date: Wed, 23 Oct 2002 09:00:32 -0400
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>From: Aita Federico /Consulente <Federico.Aita@albacom.it>
>To: "'mpls-ops@mplsrc.com'" <mpls-ops@mplsrc.com>
>Date: Wed, 23 Oct 2002 14:53:39 +0200
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>Subject: [MPLS-OPS]: Cisco and MPLS
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>X-Mailing-List: <mpls-ops@mplsrc.com> archive/latest/4692
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>
>I have some question about Cisco and MPLS, 'cause i've found some question
>that i haven't understood.
>Please help me
>
>1)is possible to implement QoS: (2 valid answer)
>-creating a different label switch path for each class
>*-using "exp" 3 bits
>*-using DiffServe Codepoints
>-using ToS bits in layer 3
>
>2)Hardware requirements for MPLS:
>-additional processing and memory is needed to built LFIB, is available only
>on high-end routers
>*-MPLS is available on low-end routers but is limited due to amount of memory
>
>3)I have my_vpn on PE. How can i check "exchange of info" between PEs:
>-on PE "show ip cef vrf" and verify that there's a label
>-on PE "show ip bgp summary"
>*-on PE "show ip bgp vpnv4" and verify that routes from remote PE have been
>received
>
>4)I have a problem with CEF, something is not working, what can i check: (3
>valid answer)
>*-CEF has been disabled on interface level
>-CEF has been disabled under vpnv4 config
>-CEF has been disabled under address-family config
>*-another feature configured has disabled CEF
>*-encapsulation used is not supported by CEF
>
>5)to limit route distribution, what can i use: (2 valid answer)
>-maximum hop
>-maximum AS-in
>*-neighbor maximum-prefix
>*-maximum route
>
>6)with IOS 12.1 how many VPN OSPF processes can run simultaneously in an
>MPLS VPN PE-router: (i think 28)
>-1
>*-28
>-255
>-depend from memory
>
>7)MPLS VPN and peer-to-peer VPN: (2 valid answer)
>*-MPLS VPN PE are aware of customers route
>-MPLS VPN PE are not aware of customers route
>-peer-to-peer VPN are aware of customers route
>*-peer-to-peer VPN are not aware of customers route
>
>8)Where's the syntax error in this config for frame-mode MPLS over ATM?
>-interface ATM 0/0.2 point-to-point
>*-pvc auto
>-ip unnumbered loopback 0
>-tag-switching ip
>
>9)tag-switching advertise-tags for LIST1 to LIST2:
>-LIST1 specifies for which network labels will be advertised
>-LIST1 specifies for which LSR neighbor labels will be advertised
>-LIST2 specifies the ending network address for which labels will be
>advertised
>-LIST2 specifies the starting network address for which labels will be
>advertised
>
>Thanks
>Federico
>
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