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EIGRP Questions 2

July 27th, 2017 in ROUTE 300-101 Go to comments

Question 1

Explanation

The “eigrp stub” command is equivalent to the “eigrp stub connected summary” command which advertises the connected routes and summarized routes.

Note: Summary routes can be created manually with the summary address command or automatically at a major network border router with the auto-summary command enabled.

Question 2

Question 3

Explanation

The syntax of “distance” command is:

distance {ip-address {wildcard-mask}} [ip-standard-list] [ip-extended-list]

Reference: https://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfindp1.html

Question 4

Explanation

If an older version of code is deployed on the hub router, it will ignore the stub TLV and continue to send QUERY packets to the stub router. However, the stub router will immediately reply “inaccessible” to any QUERY packets, and will not continue to propagate them. Thus, the solution is backward-compatible and does not necessarily require an upgrade on the hub routers.

Reference: http://www.cisco.com/en/US/technologies/tk648/tk365/technologies_white_paper0900aecd8023df6f.html

Question 5

Question 6

Explanation

To become a neighbor, the following conditions must be met:
+ The router must hear a Hello packet from a neighbor.
+ The EIGRP autonomous system (AS) must be the same.
+ K-values must be the same.

Question 7

Question 8

Question 9

Explanation

Below is an example of the “show ip eigrp neighbors” output.

EIGRP_show_ip_eigrp_neighbors_2.jpg

Let’s analyze these columns:

+ H: lists the neighbors in the order this router was learned
+ Address: the IP address of the neighbors
+ Interface: the interface of the local router on which this Hello packet was received
+ Hold (sec): the amount of time left before neighbor is considered in “down” status
+ Uptime: amount of time since the adjacency was established
+ SRTT (Smooth Round Trip Timer): the average time in milliseconds between the transmission of a packet to a neighbor and the receipt of an acknowledgement.
+ RTO (Retransmission Timeout): if a multicast has failed, then a unicast is sent to that particular router, the RTO is the time in milliseconds that the router waits for an acknowledgement of that unicast.
+ Queue count (Q Cnt): shows the number of queued EIGRP packets. It is usually 0.
+ Sequence Number (Seq Num): the sequence number of the last update EIGRP packet received. Each update message is given a sequence number, and the received ACK should have the same sequence number. The next update message to that neighbor will use Seq Num + 1.

In this question we have to check the RTO and Q cnt fields.

Question 10

Explanation

By default, EIGRP uses only the bandwidth & delay parameters to calculate the metric (metric = bandwidth + delay). In particular, EIGRP uses the slowest bandwidth of the outgoing interfaces of the route to calculate the metric as follows:

EIGRP_fomula.jpg

For an example of how EIGRP calculates the metric, please read our EIGRP tutorial (part 3).

Question 11

Question 12

Comments
  1. Pif
    August 5th, 2017

    Please where I can find the questions for these answers ?

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    August 18th, 2017

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    August 25th, 2017

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  5. Paco
    October 31st, 2017

    Q2. it is time, password is an incorrect answer

  6. 1Way
    December 4th, 2017

    Q11. Poor choice of adjectives makes this question difficult to understand. Better to describe bandwidth in terms of speed (slowest/fastest) than minimum or maximum.

  7. iec1201929
    March 9th, 2018

    Hi, In EIRGP QUESTIONs 1, WE HAVE THE NEXT QUESTION :
    Other than a working EIGRP configuration, which option must be the same on all routers for EIGRP authentication key role over to work correctly?

    AND THE ANSWER ITS “TIME”.

    In this seccion we have the same Question, but here the answer is “PASSWORDs”.

    Any knows what is the difference?

    Thnx

  8. IP_MAN
    April 1st, 2018

    Looks like for Q2, the answer is “Time”. Same as it is in the EIGRP Questions 1 section.

    Reference: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/82110-eigrp-authentication.html#req

  9. ab
    April 3rd, 2018

    Hello, for the question 2 i think the good answer is the time because when you configure this command ” accept-lifetime or send-lifetime” if the time is wrong this command doesn’t work

  10. CiscoKid
    May 1st, 2018

    Hello, Isn’t questions 3 and 5 a conflict?

  11. Anonymous
    May 18th, 2018

    They do not conflict.

    R1(config-router)# distance 91 {network} {wildcard}

    While

    R1(config-router)# distance eigrp {AD for internal routes} {AD for external routes}

    Hope this helps.

  12. Raito
    July 19th, 2018

    I agree with Anonymous, Q3 is wrong. The “distance” command is for RIP while “distance eigrp” is necessary to change the AD for EIGRP routes.

  13. Raito
    July 19th, 2018

    Nevermind, after researching details on Google I also understood. :D
    “distance” = manipulate AD for single routes
    “distance eigrp” = manipulate internal and external AD for the whole EIGRP process

  14. Treyon
    August 28th, 2018

    Which type of message does a device configured with the eigrp stub command send in response to EIGRP queries?
    A. invalid request B. unavailable C. stuck in active D. stub-only E. reject F. inaccessible

    STUB shouldn’t receive query at all – this question doesn’t make sense.

  15. Q3 example from the link
    October 4th, 2018

    Q3
    If there is a link at least check it. From the link there is this example.

    router igrp 100
    network 10.0.0.0
    distance 22 10.0.0.0
    distance 33 10.11.0.0 0.0.255.255
    distance 44 10.11.12.0 0.0.0.255

  16. Dmitry
    October 8th, 2018

    Q6, why variant F is wrong? Does EIGRP not require the same time on neighbors?

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    October 29th, 2018

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    November 13th, 2018

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