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BGP Questions

July 24th, 2017 in ROUTE 300-101 Go to comments

Question 1

Explanation

Private autonomous system (AS) numbers which range from 64512 to 65535 are used to conserve globally unique AS numbers. Globally unique AS numbers (1 – 64511) are assigned by InterNIC. These private AS number cannot be leaked to a global Border Gateway Protocol (BGP) table because they are not unique (BGP best path calculation expects unique AS numbers).

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13756-32.html

Question 2

Explanation

If MTU on two interfaces are mismatched, the BGP neighbors may flap, the BGP state drops and the logs generate missing BGP hello keepalives or the other peer terminates the session.

For more information about MTU mismatched between BGP neighbors please read: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116377-troubleshoot-bgp-mtu.html

Question 3

Explanation

Notice that the Administrative Distance (AD) of External BGP (eBGP) is 20 while the AD of internal BGP (iBGP) is 200.

Question 4

Explanation

Private autonomous system (AS) numbers which range from 64512 to 65535 are used to conserve globally unique AS numbers. These private AS number cannot be leaked to a global BGP table because they are not unique.

Question 5


Explanation

BGP Neighbor states are: Idle – Connect – Active – Open Sent – Open Confirm – Established

Question 6


Explanation

BGP peers are established by manual configuration between routing devices to create a TCP session on (destination) port 179.

Question 7


Explanation

Below is the list of BGP states in order, from startup to peering:

1 – Idle: the initial state of a BGP connection. In this state, the BGP speaker is waiting for a BGP start event, generally either the establishment of a TCP connection or the re-establishment of a previous connection. Once the connection is established, BGP moves to the next state.
2 – Connect: In this state, BGP is waiting for the TCP connection to be formed. If the TCP connection completes, BGP will move to the OpenSent stage; if the connection cannot complete, BGP goes to Active
3 – Active: In the Active state, the BGP speaker is attempting to initiate a TCP session with the BGP speaker it wants to peer with. If this can be done, the BGP state goes to OpenSent state.
4 – OpenSent: the BGP speaker is waiting to receive an OPEN message from the remote BGP speaker
5 – OpenConfirm: Once the BGP speaker receives the OPEN message and no error is detected, the BGP speaker sends a KEEPALIVE message to the remote BGP speaker
6 – Established: All of the neighbor negotiations are complete. You will see a number (2 in this case), which tells us the number of prefixes the router has received from a neighbor or peer group.

Question 8

Question 9

Comments
  1. Anonymous
    August 1st, 2016

    guys any one with the practise qstns ?

  2. Anonymous
    September 25th, 2016

    @Digitaltut – Your explanation needs a little modification

    AS numbers – http://www.iana.org/assignments/as-numbers/as-numbers.xhtml

    0 Reserved
    1->64495 Globally unique AS numbers
    64496->64511 Reserved for use in documentation and sample code
    64512->65534 Reserved for Private Use
    65535 Reserved

    Good luck friends :)

  3. fisher
    September 30th, 2016

    Hi guys,

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  4. Feel like a dud
    October 4th, 2016

    All, I failed today with a 640. The ‘300-101: Implementing Cisco IP Routing’ exam is completely different then what is on this site. Not even close. There are maybe 10 questions that are the same… What happened???

  5. Anonymous
    October 4th, 2016

    is the question changed???

  6. Feel like a dud
    October 4th, 2016

    Yes, this dump is NO LONGER VALID! They changed the exam questions

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    October 6th, 2016

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    November 4th, 2016

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    November 14th, 2016

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    December 2nd, 2016

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    December 7th, 2016

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    December 8th, 2016

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    January 18th, 2017

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  15. Anonymous
    February 15th, 2017

    why is there only one question about BGP ???

  16. david7778
    February 15th, 2017

    why is there only one question about BGP ???

  17. adgwytc
    February 16th, 2017

    I am a paid up member for ROUTE and yet cannot see any BGP questions. Could you please ensure these questions are available otherwise what is the point of paying to become a premium member?

  18. MountainMan
    February 18th, 2017
  19. Anonymous
    April 5th, 2017

    Passed today,
    Studied the questions and labs on tut.
    Also some of the questions were only in this free dumps https://drive.google.com/open?id=0B5mAFqgydmCzTGd0VU9nQVZEaEE

  20. Anonymous4
    June 5th, 2017

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    July 20th, 2017

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  22. Anonymous
    July 27th, 2017

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    July 27th, 2017

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    August 19th, 2017

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    August 21st, 2017

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    August 21st, 2017

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    August 25th, 2017

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    August 28th, 2017

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  29. Ada
    September 24th, 2017

    @digitaltut, the answer to the question #4 is C. according to RFC7300 and 300-101 Cert guide.
    the AS65535 is reserved and cant be used.
    Reference: https://tools.ietf.org/html/rfc7300

  30. milky way
    October 8th, 2017

    @ada Cisco says…..”Private autonomous system (AS) numbers which range from 64512 to 65535 are used to conserve globally unique AS numbers. ”

    I think we need to stuck in to What cisco says on cisco exams…

    https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13756-32.html

    @digitaltut what is your idea?

  31. learner
    October 12th, 2017

    Question 4

    0: reserved.
    1-64.495: public AS numbers.
    64.496 – 64.511 – reserved to use in documentation.
    64.512 – 65.534 – private AS numbers.
    65.535 – reserved

  32. learner
    October 15th, 2017

    From Official Cisco web

    https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13756-32.html

    Private autonomous system (AS) numbers which range from 64512 to 65535 are used to conserve globally unique AS numbers.
    Question 4

    0: reserved.
    1-64.495: public AS numbers.
    64.496 – 64.511 – reserved to use in documentation.
    64.512 – 65.534 – private AS numbers.

    65.535 – reserved – but still from/in private range.

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    November 9th, 2017

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    November 9th, 2017

    Smashed my route exam today, 9xx used the dumps from it libraries and tut.

  35. Leonard
    November 9th, 2017

    Passed, you can find part of the questions from the exam in this dumps https://drive.google.com/open?id=0B5mAFqgydmCzQUh0SUxOdE03VGc

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    November 11th, 2017

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    November 14th, 2017

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    November 14th, 2017

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  39. Raj7437
    November 19th, 2017

    @Feel like a dud what all labs you got ? My friend took the exam. He told all the questions came from here only. even the labs complete same. he cleared.

  40. Rick
    November 21st, 2017

    Passed today, used the 539q dumps.

  41. Danilo
    November 28th, 2017
  42. Benito
    November 28th, 2017

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  43. Tomas
    December 4th, 2017

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    December 5th, 2017

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  45. Steve
    December 12th, 2017

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