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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

Question 10

Comments
  1. novia
    January 18th, 2017

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    February 7th, 2017

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  3. Anonymous
    February 15th, 2017

    why is there only one question about BGP ???

  4. david7778
    February 15th, 2017

    why is there only one question about BGP ???

  5. 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?

  6. MountainMan
    February 18th, 2017
  7. Anonymous4
    June 5th, 2017

    How come there is only, one BGP question? I am also a premium member but can only see just the one.

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    July 20th, 2017

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    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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  16. 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

  17. 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?

  18. 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

  19. 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.

  20. Otha
    November 9th, 2017

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  21. Chuck
    November 9th, 2017

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    November 9th, 2017

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    November 11th, 2017

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    November 14th, 2017

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    November 19th, 2017

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  26. Rick
    November 21st, 2017

    Passed today, used the 539q dumps.

  27. Winfred
    December 5th, 2017

    Confirming the 440q dumps are valid.

  28. Steve
    December 12th, 2017

    Scored 9xx, used dumps from IT-Libraries. You can find them on the net for free or in the comments here.

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    December 13th, 2017

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  30. buttmunch
    December 19th, 2017

    3rd to confirm Q4 should be C 64512-65534 (65535 is reserved)

    Update this shiznit.

  31. Clock
    December 30th, 2017

    Hello folks

    Please someone who took the test recently (No spammers) please confirm the dumps that we can trust or if the questions in this site are correct.
    Not only for me, maybe for all of who will take the test.

  32. 1WAY
    January 8th, 2018

    Q8. Is it just me or does anyone else feel that B ‘as_path’ pre-pending is a better answer than A’MED’.

  33. Anonymous
    January 15th, 2018

    Q8 B seems to be correct

  34. abnormaldehyde
    January 16th, 2018

    Q8 should be AS_Path.

  35. United
    January 20th, 2018

    Need questions for all this answers. Please share something…..

  36. Clock
    January 21st, 2018

    Hello Team,

    I would like to thank you for the advises and that you share your experience, I recently pass the route exam :D….
    I study with the Official cert Kevin Wallace, CBT nuggets (nothing that you cannt find for your own in a torrent) and with this site.
    I can say that I found a couple of new questions and a new Frame relay drag and drop that is not here:

    SVC —— A circuit that provides temporary on-demand connections between DTEs
    DLCI—— A locally significant ID
    PVC ——-A logical connection comprising two endpoints and CIR
    LMI ——- A signaling mechanism for frame relay devices
    FECN—– An indicator of congestion on the network.

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  37. Rizwan
    February 13th, 2018

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  38. Marcus
    April 7th, 2018

    I’m not sure about Q8, but answer may be A (MED). The question asks about making decision between links and we can find in OCG next statements:
    “The name Multi-Exit Discriminator actually describes its function to a great degree.
    With a dual-homed design, at least two links exist between an enterprise and its ISP. The
    enterprise can announce to the ISP a value (MED) that tells the ISP which path into the
    enterprise is best. As a result, the ISP can discriminate between the multiple exit points
    from that ISP to the enterprise”.

    But I am confused by the mention of two AS in the question, so I am not 100% sure.

  39. Henry
    May 2nd, 2018

    Hi Guys!Do you know AS-PAth attribute of BGP? I found this
    https://ipcisco.com/bgp-path-attributes-as-path/

  40. Montenegro
    May 19th, 2018

    Q 9. Can anybody explain the question about format of IPv4 converted to IPv6?

  41. htown
    May 25th, 2018

    Q9. Explanation

    IPv4-compatible IPv6 addresses are IPv6 unicast addresses that have zeros in the high-order 96 bits of the address, and an IPv4 address in the low-order 32 bits. They can be written as 0:0:0:0:0:0:A.B.C.D or ::A.B.C.D, where “A.B.C.D” represents the embedded IPv4 address.

  42. htown
    May 25th, 2018

    Q9. Explanation

    Also see this:

    The IPv4 address of your border router is 192.168.99.1. Derive your 6to4 prefix from your IPv4 address by converting the decimal components of the IPv4 address to hexadecimal and then prefixing “2002” to the resulting hexadecimal numbers. So the 6to4 prefix for the IPv6 nodes in your network is 2002:C0A8:6301::/128.

    https://www.cisco.com/c/en/us/support/docs/ip/ip-version-6-ipv6/45741-6bone-tc-1.html?referring_site=bodynav

  43. chadhsadasd5555
    May 30th, 2018

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  44. Ahmad
    June 2nd, 2018

    Hi, whole lessons of CCNP route :
    https://ipcisco.com/ccnp-route/
    enjoy…

  45. Sakurai
    June 10th, 2018

    There is a new MC question about bgp

    Router: A————B=========C
    AS: 65000 65001

    It shows some configure of Router B, after implement, neighbour relationship with Router C is broken

    Ask how to fix that

    A: Forgot
    B: Multihop change to 1
    C: Forgot
    D: IBGP change to EBGP

  46. Joey
    June 11th, 2018

    Confirming above question (BGP) Sakurai mentioned was in test.

  47. delwans
    July 5th, 2018

    Q4!!!!

    Should be 64512-65534!!

    65535 is reserved!

  48. Anonymous
    July 12th, 2018

    Hi All, can anybody share latest dumps(route) with me at eng.sonjoy @ gmail.com

    Thanks in advance.

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    September 8th, 2018

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  50. missing questions?
    September 25th, 2018

    I can’t see any of the questions. am i missing something?

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