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GLBP Questions

June 14th, 2017 in SWITCH 300-115 Go to comments

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

Question 1

Explanation

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

Explanation

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

Explanation

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

Explanation

GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address 224.0.0.102, 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

Comments
  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 :)

    cheers

  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 172.16.10.8 8080 172.16.10.8 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
    172.16.10.8:80 is translated to 172.16.10.8:8080.
    B. Any packet that is received in the inside interface with a source IP port address of
    172.16.10.8:8080 is translated to 172.16.10.8:80.
    C. The router accepts only a TCP connection from port 8080 and port 80 on IP address
    172.16.10.8.
    D. Any packet that is received in the inside interface with a source IP address of 172.16.10.8
    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.

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