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GLBP Questions

August 30th, 2017 in SWITCH 300-115 Go to comments

Note: If you are not sure about GLBP, please read our GLBP tutorial.

Question 1


The error message indicates a possible layer2 loop and STP configuration issues. Notice that the “duplicate address” here means the MAC address.

In order to resolve this issue, issue the show interface command to verify the MAC address of the interface. If the MAC address of the interface is the same as the one reported in the error message, then it indicates that this router is receiving its own hello packets sent. Verify the spanning-tree topology and check if there is any layer2 loop. If the interface MAC address is different from the one reported in the error message, then some other device with a MAC address reports this error message.

Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/81565-glbp-cat65k.html#dr

Question 2


The active virtual gateway (AVG) is responsible for answering the ARP Request for the virtual IP address. Load sharing is achieved by the AVG replying to the ARP requests with different virtual MAC addresses.

Question 3


A GLBP group only has a maximum of four AVFs (means four virtual MAC addresses). If there are more than 4 gateways in a GLBP group then the rest will become Standby Virtual Forwarder (SVF) which will take the place of a AVF in case of failure.

Question 4

Question 5

Question 6


GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address, User Datagram Protocol (UDP) port 3222 (source and destination).

Reference: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html

Question 8

Question 9


GLBP has three authentication schemes:

+ No authentication
+ Plain text authentication
+ MD5 authentication

Question 10

Question 11

Question 12

Question 13

  1. 14341
    June 23rd, 2015

    Anyone here who have encountered other GLBP questions?

  2. Sean nee boo
    July 15th, 2015

    Does anybody know if the 300-115 exam have any FHRP simulations?

  3. SAM
    August 28th, 2015

    where are all the questions :(

  4. certprepare
    August 29th, 2015

    Because of copyrighted issues, certprepare had to remove all questions and answers. You can download them at http://www.mediafire.com/view/9mq20kx0mgam6k7/SWITCH_July_2015.pdf

  5. SAM
    December 11th, 2015

    thanks i found them already while reading comments on another page :)


  6. Jake
    December 2nd, 2016

    Please send dumps to eigrp100@gmail dot com

  7. ahemd erlrofaie
    January 17th, 2017

    Refer to the following configuration command.
    router(config)# ip nat inside source static tcp 8080 80
    Which statement about the command is true?

    A. Any packet that is received in the inside interface with a source IP port address of is translated to
    B. Any packet that is received in the inside interface with a source IP port address of is translated to
    C. The router accepts only a TCP connection from port 8080 and port 80 on IP address
    D. Any packet that is received in the inside interface with a source IP address of
    is redirected to port 8080 or port 80.

    here in tagwa dump it say the correct answer is a but i think it b , can any one advice

  8. iphelper
    July 12th, 2017

    @Ahemd erlrofaie, that’s for ROUTE….

  9. iphelper
    July 12th, 2017

    And you’re not the person you’re claiming to be as I have seen this name and comment back when I studied ROUTE.

  10. iphelper
    July 12th, 2017

    Oh crap, I’ve clicked the wrong section.

  11. CertPrep Nickname
    September 8th, 2017


    hehe I saw that fail

  12. Kurt
    October 17th, 2017

    @Iphelper, could you please share the dummies. Here’s my gmai- kurtcobain19410. I would be very thankful.

  13. vick
    November 15th, 2017

    kindly help for sharing dumps at {email not allowed}

  14. vick
    November 16th, 2017

    vkrm657 @ gmail dot com

  15. I love butter
    December 9th, 2017

    Question 7 Explanation:
    1.VRRP uses the Multicast IP of, not That Multicast is HSRPv2. A is false
    2. The MAC address of 0000.0c07.ac0c belongs to HSRP, specifically group 12 (0c hex to dec comes out to 12), so B is false.
    3. HSRP multicasts out from, (v2 from not 18. So C is false.
    4. GLBP uses source and destionation UDP port 3222. So D is true.

  16. RA
    January 23rd, 2018

    why in Q6 D is not correct?

  17. 1WAY
    February 16th, 2018

    Question and explanation numbers seem out of sync since the new questions have been published.

  18. Archangel
    March 4th, 2018

    Q10——–By default, GLBP routers use the local multicast address to send hello packets to their peers every 3 seconds over UDP 3222 (source and destination).

  19. Tinman
    March 8th, 2018

    Question 5
    Members of a GLBP group elect one gateway to be the active virtual gateway (AVG) for that group. Other group members provide backup for the AVG in the event that the AVG becomes unavailable.

    A is correct

  20. Sergio
    March 12th, 2018

    Most of these questions (and most of the answers) don’t make sense…

  21. Confuse guy
    March 27th, 2018


    Quoting Cisco

    “A. An HSRP-enabled router with preempt configured attempts to assume control as the active router when its Hot Standby priority is higher than the current active router. The standby preempt command is needed in situations when you want an occurring state change of a tracked interface to cause a standby router to take over from the active router. For example, an active router tracks another interface and decrements its priority when that interface goes down. The standby router priority is now higher and it sees the state change in the hello packet priority field. If preempt is not configured, it cannot take over and failover does not occur.”

    I guess the HRSP need preempt command configured to take over. If no preempt, it will not assume active role even the priority is higher

  22. mimikongag
    April 18th, 2018

    latest valid CCNP dumps

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