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OSPF Evaluation Sim

February 9th, 2015 in Lab Sim Go to comments

You have been asked to evaluate an OSPF network and to answer questions a customer has about its operation. Note: You are not allowed to use the show running-config command.

OSPF.jpg

Although in this sim we are not allowed to use “show running-config” command but we post the configuration here so that you can understand more about the topology.

R1
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Serial0/0
ip address 192.168.13.1 255.255.255.0
ip ospf network non-broadcast
no shut
!
router ospf 1
network 192.168.13.0 0.0.0.255 area 0
network 1.1.1.1 0.0.0.0 area 0
R2
interface Loopback 0
ip address 2.2.2.2 255.255.255.255
!
interface S0/0
ip address 192.168.23.2 255.255.255.0
ip ospf network non-broadcast
no shut
!
router ospf 1
network 192.168.23.0 0.0.0.255 area 0
network 2.2.2.2 0.0.0.0 area 0
neighbor 192.168.23.3
R3
interface Loopback 0
ip address 3.3.3.3 255.255.255.255
!
interface Ethernet0/0
ip address 192.168.34.3 255.255.255.0
no shut
!
interface S1/0
ip address 192.168.23.3 255.255.255.0
ip ospf network non-broadcast
no shut
!
interface S1/1
ip address 192.168.13.3 255.255.255.0
ip ospf network non-broadcast
no shut
!
router ospf 1
network 192.168.13.0 0.0.0.255 area 0
network 192.168.23.0 0.0.0.255 area 0
network 192.168.34.0 0.0.0.255 area 1
network 3.3.3.3 0.0.0.0 area 0
area 1 virtual-link 4.4.4.4
neighbor 192.168.23.2
R4
interface Loopback 0
ip address 4.4.4.4 255.255.255.255
interface Ethernet0/0
ip address 192.168.34.4 255.255.255.0
no shut
!
interface Ethernet0/1
ip address 192.168.45.4 255.255.255.0
no shut
!
interface Ethernet0/2
ip address 192.168.46.4 255.255.255.0
no shut
!
router ospf 1
network 192.168.34.0 0.0.0.255 area 1
network 192.168.45.0 0.0.0.255 area 2
network 192.168.46.0 0.0.0.255 area 3
network 4.4.4.4 0.0.0.0 area 1
area 1 virtual-link 3.3.3.3
area 2 nssa
area 3 stub no-summary
R5
interface Loopback0
ip address 5.5.5.5 255.255.255.255
interface Loopback1
ip address 5.5.1.1 255.255.255.255
interface Loopback2
ip address 5.5.2.1 255.255.255.255
interface Loopback3
ip address 5.5.3.1 255.255.255.255
interface Loopback4
ip address 5.5.4.1 255.255.255.255
interface Ethernet0/0
ip address 192.168.45.5 255.255.255.0
no shut
!
router ospf 1
network 192.168.45.0 0.0.0.255 area 2
network 5.5.0.0 0.0.255.255 area 2
area 2 nssa
R6
interface Ethernet0/0
ip address 192.168.46.6 255.255.255.0
no shut
interface Loopback 0
ip address 6.6.6.6 255.255.255.255
!
router ospf 1
network 192.168.46.0 0.0.0.255 area 3
network 6.6.6.6 0.0.0.0 area 3
area 3 stub

Some notices from above configuration:

+ The OSPF network type between R2 & R3 is non broadcast.
+ R3 and R4 is running virtual-link to connect Area 2 & 3 to Area 0
+ Area 2 is a NSSA area while Area 3 is a Totally Stubby area

You can download this sim to practice at http://www.isisbeautyconcepts.com.au/?certs=download/ROUTE_OSPF.zip. Please use GNS3 with version older than v1.0 to open it (v0.8.3.1 for example). IOS used in this lab: c3640-jk9s-mz.124-16.bin

Question 1

Explanation

To check OSPF LSA we should use the “show ip ospf database” command on R5:

R5_show_ip_ospf_database.jpg

In this sim there is no LSA Type 4 because there is no ASBR so maybe this question wants to ask about LSA Type 3 (Summary Net Link States).

Note: LSA Type 4 is generated by ABR, not ASBR but without ASBR inside the network there are no LSA Type 4 generated. For more information about OSPF LSA Types please read our OSPF LSA Types Lab tutorial.

R3 advertises LSA Type 1 to R4 then R4 converts it into Type 3 and sends to R5 (because R4 is the ABR) so we see the “Link ID” 3.3.3.3 of R3 is advertising by R4 (4.4.4.4). According to the “Age” column, this LSA was advertised 1858 seconds ago.

Question 2

Explanation

Check the Serial1/0 interface of R3 which is connected to R2 with the “show ip ospf interface serial 1/0” command:

R3_show_ip_ospf_interface_serial.jpg

There are two things we should notice from the output above:
+ The “network type” connection between R2-R3 is “NON_BROADCAST” (usually we have “BROADCAST”). OSPF neighbors are discovered using multicast Hello packets. In non broadcast environment, multicast (and broadcast) messages are not allowed so OSPF neighborship cannot be formed automatically. Therefore we have to establish OSPF neighborship manually by using “neighbor ” command under OSPF process (OSPF will send unicast Hello message to this address). For example on R2 we have to use these commands:

router ospf 1
neighbor 192.168.23.3

And on R3:

router ospf 1
neighbor 192.168.23.2

+ For non broadcast environment the default Hello timer is 30 seconds; Dead timer (time to wait before declaring a neighbor dead) is 120 seconds and Wait timer (causes the interface to exit out of the wait period and select a DR on a broadcast network. This timer is always equal to the dead timer interval) is 120 seconds. In the output we also see the default timers for non broadcast network.

Question 3

Explanation

We can check the number of executed SPF algorithm via the “show ip ospf” command on R4:

R4_show_ip_ospf.jpg

In the output above we can see SPF has been executed 9 times.

Question 4

Explanation

Area 2 (of R5) is a Not-so-Stubby area (NSSA). You can check it by the “show ip ospf” command on R4 or R5 (in Area 2 section). For example, below is the output of “show ip ospf” command on R5:

R5_show_ip_ospf.jpg

In general, NSSA is same as normal area except that it can generate LSA Type 7 (redistribute from another domain) so we can see both Loopback interfaces of R5 & R6 in the routing table of R5.

R5_show_ip_route.jpg

Note: NSSA does not receive a default route by default so you will not see a default route on R5.

Area 3 (of R6) is a Totally-Stubby area so R6 only has one default route to outside world. You can check with the “show ip ospf” command on R4 and R6 (area 3 section):

R4_show_ip_ospf_area3.jpg

R6_show_ip_ospf.jpg

Notice that on R4 you will get more detail (shows “stub area, no summary LSA”) than on R6 (only shows “stub area”).

R6 is in a totally-stubby area so we will not see any R5’s Loopback interfaces in R6 routing table:

R6_show_ip_route.jpg

Note: You can see a default (summary) route to the outside (O*IA 0.0.0.0/0 …)

Comments
Comment pages
1 6 7 8 1016
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  10. Routerking
    August 25th, 2017

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    September 21st, 2017

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  19. Cool-Guy
    September 27th, 2017

    Question 2
    Which of the following statements is true about the serial links that terminate in R3?
    A. The R1-R3 link needs the neighbor command for the adjacency to stay up
    B. The R2-R3 link OSPF timer values are 30, 120, 120
    C. The R1-R3 link OSPF timer values should be 10,40,40
    D. R3 is responsible for flooding LSUs to all the routers on the network.
    Answer: B
    Explanation

    Why is Question A not correct when R1 and R3 have NON Broadcast serial interfaces???

  20. cisco
    September 29th, 2017

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    October 4th, 2017

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  25. ColCriss
    October 4th, 2017

    i just passed Routing exam with 930 Marks. 470Q from exam are still valid i just got 2 or 3 new questions. The exam dumps are not cheap they are 80us but
    in my opinion it totally worth it!

    In my exam the simulators were:

    1. OSPF Evaluation Sim –> Exacly the same the only difference is that in Question 2 the Answer is: The R1-R3 link needs the neighbor command for the adjacency to stay up.
    Because the Network Type between R2-R3 is not NON_BROADCAST so it has differents timers (30,120,120) So in the exam be carefull and check for the timers.

    2. EIGRP Evaluation Sim –> This simulator is exacly the same and you can find the answers the same way Digitaltut explains it.

    3. Policy Based Routing Sim –> Dont worry about IP SLA! in real life it would be totally necessary but in the exam you cannot type the IP SLA commands so just configure
    the Route-map the ACL and the interface configuration.

    4. EIGRP OSPF Redistribution Sim –> Dont worry about assymetric Routing ! in your simulations in GNS3 it may happen you have it but in the exam you cannot even do traceroute on R4
    Just follow the same steps explained in Digitaltut and this lab would be very easy. In the exam the interfaces between R2 – R3 are FastEthernet so you must configure the distance eigrp 90 105 on R2
    This command has to be applied inside the Eigrp Routing process:

    R2(config-router)#router eigrp 100
    R2(config-router)#distance eigrp 90 105

    When you shut down the interface between R2-R3 the traffic should go R2-R4. The only router that allows Traceroute is R1.

    5. OSPF Sim –> This lab is very easy, the same as explained in Digitaltut.

    Hope this information helps!.

  26. Fredrick
    October 6th, 2017

    Passed today, used the 539q dumps.

  27. Cloud
    October 6th, 2017

    @Frederick

    Can you share us the 539q dumps? :)

  28. Chris
    October 7th, 2017

    Please send the latest dumps of 300-101 on: {email not allowed}

  29. JeanV
    October 8th, 2017

    I just going to post again the “Cool-Guy” comment. I’m in doubt too about this:

    Question 2
    Which of the following statements is true about the serial links that terminate in R3?
    A. The R1-R3 link needs the neighbor command for the adjacency to stay up
    B. The R2-R3 link OSPF timer values are 30, 120, 120
    C. The R1-R3 link OSPF timer values should be 10,40,40
    D. R3 is responsible for flooding LSUs to all the routers on the network.
    Answer: B

    Why is Question A not correct when R1 and R3 have NON Broadcast serial interfaces???

    Please, we need your help. Thanks in advance.

  30. CiscoDaddy
    October 9th, 2017

    JeanV – Apparently not anymore. If you check the timer values for the interface they match 30, 120, 120.. So answer is A

  31. mike
    October 10th, 2017

    JeanV, CiscoDaddy

    So A and B are both true then..

  32. ahmed
    October 11th, 2017

    Hi my fri
    the question is ask you R1 and R3 but it is informartion related serial port look the question

    Which of the following statements is true about the serial
    A. The R1-R3 link needs the neighbor command for the adjacency to stay up
    B. The R2-R3 link OSPF timer values are 30, 120, 120
    C. The R1-R3 link OSPF timer values should be 10,40,40
    D. R3 is responsible for flooding LSUs to all the routers on the network

    that is what i think

  33. ahmed
    October 11th, 2017

    i misse typed this but what i mean is
    the question is not asking you

  34. CiscoDaddy
    October 14th, 2017

    Mike. it depends on the question that is asked, and the config of route at the time of exam as to what the answer is. OSPF by default uses broabcast.. but config on both R2&R3 use no broadcast command(as far as we know) meaning any connection between them would need be by unicast hence the reason for ospf neighbor command.

    + For non broadcast(unicast) environment the default Hello timer is 30 seconds; Dead timer 120 and 120. By running command R3: sh ip ospf int s1/0(connecting to R2) to will be able to verify the unicast timers in use.

    So to answer your question. What are the timer values for R3 to R2 for unicast?(The R2-R3 link OSPF timer values are 30, 120, 120)
    OR
    Are both R1&R3 using no broadcast on their serial links? (The R1-R3 link needs the neighbor command for the adjacency to stay up) If both are true :/ which is likely the case.. then god knows!

  35. CiscoDaddy
    October 14th, 2017

    Whats everyone’s idea of what Q1 might be? What is the AGE of LSA type 4?

  36. fiddy
    October 15th, 2017

    Hi ,

    Can someone please help how we can open these Exam Lab sims in GNS3 ?
    I can’t open it it at the moment

  37. fiddy
    October 15th, 2017

    Hi,
    I have tried to open route Exam sims in GNS v1.5.2 but after opening topology all nodes in the topology turned red , when I click over the node it says ” This node is not initialized”

    Can someone please know how to fix this so that I can practice these exam labs ?? or any other way to practice these labs

  38. First of my name
    October 18th, 2017

    Seems to be an error in the OPSF topology diagram, as encountered on the actual exam and confirmed here. R3 s1/1 is diagrammed as connecting to R1 and s1/0 is diagrammed as connecting to R2. However, in the actual exam, show cdp neigh and show ip ospf interface both confirmed that R1 appears on s1/0 of R3 and R2 appears on s1/1 of R3.

    These kind of problems with the exam cause confusion, even if they perhaps don’t prevent you from getting to the correct answer. Shame this is happening on a $300 exam.

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