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ICND2 – OSPF Hotspot

January 16th, 2018 in ICND2 200-105 Go to comments

Note: If you are not sure about OSPF, please read my OSPF tutorial first.

Question

This item contains several questions that you must answer. You can view these questions by clicking on the corresponding button to the left. Changing questions can be accomplished by clicking the numbers to the left of each question. In order to complete the questions, you will need to refer to the topology.
To gain access to the topology, click on the topology button at the bottom of the screen. When you have finished viewing the topology, you can return to your questions by clicking on the Questions button to the left.

Each of the windows can be minimized by clicking on the [-]. You can also reposition a window by dragging it by the title bar.

OSPF_message.jpg

Question 1

Explanation

The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence:

+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
+ The router ID can be manually assigned

In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID.

Question 2

Explanation

HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds.

Although OSPF is a link-state protocol but the full database from each router is sent every 30 minutes (not seconds) -> C and D are not correct.

Question 3

Question 4

Question 5

Explanation

Although OSPF is configured using default classful addressing but OSPF is a link-state routing protocol so it will always send the subnet mask of each network in their advertised routes. Therefore R1 will learn the the complete subnets. Four networks list below will be in the routing table of R1:
+ 172.16.2.64/30
+ 172.16.2.228/30
+ 172.16.2.232/30
+ 172.16.3.0/24

Note: Other networks will be learned as “Directly connected” networks (marked with letter “C”)

Comments (5) Comments
  1. Nzee
    January 17th, 2018

    can someone provide the total configuration so that this sim can be reproduced in packet tracer or GNS3? help please.

  2. ABC
    February 7th, 2018

    the following is indicated on he website “This item contains several questions that you must answer. You can view these questions by clicking on the corresponding button to the left.”

    and there is no button on the left to see the questions. only answer are shown.

  3. Cinculator
    February 13th, 2018

    Can anyone explain the answers for question 4? I don’t quite understand how you got to them.

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    February 20th, 2018

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  5. Hehe
    February 21st, 2018

    I think you’ve got wrong picture for Question 4. In that case R1 and r3 WIll never become neighbors because they don’t reside on the same link