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    CCNP BCMSN(642-812) HotSpot – Super HSRP

    By admin | July 30, 2009

    Ferris Plastics,Inc. is a medium sized company,with enterprise network(access,distribution and core) switches that provide LAN connectivity from user PCs to corporate servers.The distribution switches are configured to use HSRP to provide a high availability solution as follows:

    -DSW1(Distribution Switch 1)is the primary device for VLAN 101,VLAN 102 and VLAN 105.

    -DSW2(Distribution Switch 2)is the primary device for VLAN 103 and VLAN 104.

    -A failure of GigabitEthernet1/0/1 on the primary device should block the primary device from being the active device,unless GigabitEthernet1/0/1 on the backup device has also failed.

    image

    Troubleshooting has identified several issues.Currently all interfaces are up.Use the running configurations and the available show commands to investigate and respond to the following question.

    Question1:

    During rutine maintenance,it became necessary to shut down GigabitEthernet1/0/1 on DSW1.All other interfaces were up.During this time, DSW1 remained the active device for VLAN 102`s HSRP group.You have determined that there is an issue with the decrement value in the track command in VLAN 102’s HSRP group.What needs to be done to make the group function properly?

    A.The DSW1’S decrement value should be configured with a value from 5 to 15.

    B.The DSW1’S decrement value should be configured with a value from 9 to 15.

    C.The DSW1’S decrement value should be configured with a value from 11 to 18.

    D.The DSW1’S decrement value should be greater than 190 and less 200.

    E.The DSW1’S decrement value should be configured with a value from 195 to less than 205.

    F.The DSW1’S decrement value should be configured with a value from 200 to less than 205.

    Correct Answer: C

    Explanation:

    Use "show run" command to show. The left Vlan102 is console1 of DS1. Priority value is 200, we should decrement value in the track command from 11 to 18. Because 200 – 11 = 189 < 190 ( priority of Vlan102 on DS2 ).

    Question2:

    During routine maintenance,GigabitEthernet1/0/1 on DSW1 was shut down.All other interfaces were up. DSW2 became the active HSRP deveice for VLAN101 as desired.However,after GigabitEthernet1/0/1 on DSW1 was reactivated.Dsw1 did not become the active device as desired.

    What needs to be done to make the group for VLAN 101 function properly?

    A.Enable preempt in DSW1’s VLAN 101 HSRP group.

    B.Disable preempt in DSW2’s VLAN 101 HSRP group.

    C.Decrease DSW’1 priority value for VLAN 101’s HSRP group to a value that is less than the .priority value configured on DSW2’s HSRP group for VLAN 101.

    D.Decrease the decrement value in the track command for DSW1’s VLAN 101 HSRP group to a value less than the value in the track command for DSW2’s VLAN 101 HSRP group.

    Correct Answer: A

    Explanation:

    A is correct. All other answers is incorrect. Because Vlan101 on DS1 ( left ) disable preempt. We need enable preempt to after it reactive , it will be active device. If not this command, it never become active device.

    Question3:

    DSW2 has not become the active device for VLAN 103’s HSRP group even though all interfaces are active.As related to VLAN 103`s HSRP group,what can be done to make the group function properly?

    A.On DSW1,disable preempt.

    B.On DSW1, decrease the priority value to a value less than 190 and greater 150.

    C.On DSW2, increase the priority value to a value greater 241 and less than 249.

    D.On DSW2, increase the decrement valus in the track command to a value greater than 10 and less than 50.

    Correct Answer: C

    Question4:

    If GigabitEthernet1/0/1 on DSW1 is shut down,what will be the current priority value of the VLAN 105`s HSRP group on router DSW1?

    A.95

    B.100

    C.150

    D.200

    Correct Answer: A

    Explanation:

    Priority is configured 150, Track is 55. So, if shutdown interface G1/0/1 –> 150 – 55 = 95.

    Question5:

    What is the configured priority value of VLAN 105`s HSRP group on DSW2?

    A.50

    B.100

    C.150

    D.200

    Correct Answer: B

    Explanation:

    Use "show stantby brieft" command on console2 . Very easy to see priority of Vlan105 is 100.

    Question6:

    During routine maintenance,it became necessary to shut down GigabitEthernet1/0/1 on DSW1 and DSW2.All other interfaces were up.During this time,DSW1 became the active device for VLAN 104`s HSRP group.As related to VLAN 104`s HSRP group,what can to be done to make the group function properly?

    A.On DSW1,disable preempt.

    B.On DSW2, decrease the priority value to a value less than 150.

    C.On DSW1, increase the decrement value in the track command to a value greater than 6.

    D.On DSW1, disable the track command.

    Correct Answer: C

    Explanation:

    We should NOT disable preempt on DS1. By do that, you will make Vlan104’s HSRP group fail function. Example: if we are disable preempt on DS1. It can not become active device when G1/0/1 on DS2 fail. In this question, G0/1/0 on DS1 & DS2 is shutdown. Vlan104 (left) : 150 – 1 = 149. Vlan104 (right) : 200 – 155 = 145. Result is priority 149 > 145 ( Vlan104 on DS1 is active). If increase the decrement in the track value to a value greater than 6 ( > or = 6). Vlan104 (left) : 150 – 6 = 144. Result is priority 144 < 145 ( vlan104 on DS2 is active).

             

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    Topics: 642-812 Exam, 642-892 Exam, CCNP | 4 Comments »

    4 Responses to “CCNP BCMSN(642-812) HotSpot – Super HSRP”

    1. Boy_Racer Says:
      September 21st, 2009 at 2:43 am

      Shouldn’t there be a screenshot of the config for Question 3?

    2. Boy_Racer Says:
      September 22nd, 2009 at 4:53 am

      Pass4Sure’s screenshots show that DSW1’s priority for vlan 103 has been set to 200, while DSW2’s priority has been set to 190. As DSW2 should be the the Active device for VLAN103 then DSW1’s priority will need to be less than 190 in order to make DSW2 the Active device. This would make B the correct answer in my opinion.

    3. Boy_Racer Says:
      September 21st, 2009 at 2:45 am

      Question 4 shows a screensot of the out of a “show interface vlan 105” command. Would doing “show run int vlan 105” not also show the required information and be more readable?

    4. Boy_Racer Says:
      September 21st, 2009 at 2:48 am

      …oops! meant to say it shows the outout of a “show standby brief” command.

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