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BGP Questions

November 2nd, 2018 Go to comments

Note: If you are not sure about BGP, please read our BGP Tutorial.

Question 1


This command can be used to verify if a BGP connection to a BGP neighbor is good or not. Let’s see an example:


Please pay attention to the “State/PfxRcd” column of the output. It indicates the number of prefixes that have been received from a neighbor. If this value is a number (including “0”, which means BGP neighbor does not advertise any route) then the BGP neighbor relationship is good. If this value is a word (including “Idle”, “Connect”, “Active”, “OpenSent”, “OpenConfirm”) then the BGP neighbor relationship is not good.

In the outputs above we see the BGP neighbor relationship between R1 & is good with 2 Prefix Received (PfxRcd) while the BGP neighbor relationships between R1 &; R1 & are not good (they are in “Active” and “Idle” state).

Question 2


This is an example of how to configure BGP neighbor between two routers (suppose all interfaces are configured correctly)


R1(config)#router bgp 1
R1(config-router)#neighbor remote-as 2
R2(config)#router bgp 2
R2(config-router)#neighbor remote-as 1

So as you see, we need the neighbor’s IP address and neighbor’s AS number for the BGP neighbor relationship.

Question 3


First please notice that unlike other routing protocols like OSPF or EIGRP, we have to use subnet mask, not wildcard mask, to advertise the routes in the “network” command -> C is not correct.

Secondly, with BGP, you must advertise the correct network and subnet mask in the “network” command ( in this case network BGP is very strict in the routing advertisements. In other words, BGP only advertises the network which exists exactly in the routing table (in this case network x.x.x.32/27 exists in the routing table as the Fa0/0 interface). If you put the command “network x.x.0.0 mask” or “network x.0.0.0 mask” or “network x.x.x.33 mask” then BGP will not advertise anything.

Therefore the full command in this question is “network mask”.

For more information about BGP configuration, please read our Basic BGP Configuration tutorial.

Question 4

Question 5

Comments (30) Comments
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  1. question 3
    March 3rd, 2017

    Why is . x.x.x.33 mask not correct

  2. NN
    March 5th, 2017

    Why is . x.x.x.33 mask not correct [2]

  3. dimemolight
    March 8th, 2017

    because network address is x.x.x.32

  4. deadcell
    March 29th, 2017

    it is correct only…

  5. Anonymous
    May 2nd, 2017

    b/c the network address is x.x.x.32

  6. Merlin
    June 13th, 2017

    Passed today, used the 747q dumps.

  7. Parthi
    June 17th, 2017


    I planned to write the exam in next week
    Pls share the dumbs aktparthiban @ gmail . com

  8. @Bcc
    June 23rd, 2017

    Please provide the link to 747q

  9. BPM
    July 8th, 2017

    necesitas anunciar el ID de red, no la ip de la interface. ;D

  10. Mik
    July 14th, 2017

    Please share the dumps {email not allowed}

  11. Mik
    July 14th, 2017

    July 14th, 2017
    Please share the dumps to Michael Andrew Snee @ gmail . com

  12. Anonymous
    July 24th, 2017

    Why answer x.x.x.32 is correct rather x.x.x.33

    ip address need to advertise on BGP
    WHy mask is correct

  13. Syed S Rahmani
    July 24th, 2017

    Why answer x.x.x.32 is correct rather x.x.x.33

    ip address need to advertise on BGP
    WHy mask is correct

  14. louys
    August 8th, 2017

    Could someone send me a least dump?
    lajos . berczi @ gmail . com

    Thank you!

  15. Mo
    August 16th, 2017

    Pls share the lastest dump
    {email not allowed}

  16. rolllaverge
    August 17th, 2017

    There’s a mistake in Q3 because in BGP you have to advertise the exact route known in the routing table, in this case it is (directly connected)

    the given information is:
    interface fa0/0
    ip address

  17. walker
    August 31st, 2017

    How to configure BGP over PPPoE?
    {email not allowed}

  18. Bhagya
    October 24th, 2017

    Merlin, can you send me too 747q dumps, bhagyaf@gmail . com. ??

  19. Snowkids
    January 13th, 2018

    @9TUT, indeed for Q3, answer should be D .33.
    Could please advise if its otherwise?

  20. shruti
    January 18th, 2018

    As i m preparing for CCNA, do I need to do BGP configurations thoroughly too? O r BGP configuration is a CCNP topic.? Please reply me asap.

  21. abiy
    January 24th, 2018

    please dump

  22. here is the link to the latest dumb
    March 16th, 2018

    google 9tut dumb 2018 for the latest dumb

  23. dani
    July 18th, 2018

    For those who are confused with Q3:
    int fa0/0 is given the ip address of .33 but it belongs to subnet, and Router will put this Network as it is in the Routing table, so as far as we know BGP is strict in making network advertisements, so for the network command to work, we have to put network command exactly matching with the entry in the routing table.

  24. Mohan Ghimire
    August 25th, 2018

    please send the dumb (200-125)
    my email gmohan50 @ outlook . com

  25. Andrzej
    November 8th, 2018

    In Q3 we Haven to use network address not int address so correctly is. 32

  26. ADITYA
    March 21st, 2019

    Can anyone please share the latest CCNA dumps
    email: {email not allowed}

  27. Mukanov Merey
    April 23rd, 2019

    @ADITYA , I have new base for CCNA. Release date 8 april. Can send you.

  28. Mukanov Merey
    April 23rd, 2019

    @ADITYA, write to me on email {email not allowed}

  29. rrr
    October 22nd, 2019

    email not allowed
    you had a good talk


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