OSPF Evaluation Sim
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.
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.digitaltut.com/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:
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:
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:
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:
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.
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):
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:
Note: You can see a default (summary) route to the outside (O*IA 0.0.0.0/0 …)
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What is the correct answer for –
Which two reasons fir IP SLA tracking failure are likely true?
in some dumps I found A,C and others BE
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Hi everyone
where can I find the labs for the exam ?
thank you
Passed CCNP today…. Score: 790, Lot of new questions, drag and drops and there are few changes in the Lab sims. LABs: PBR, OSPF & EIGRP Eval, Redist. Dumps are still valid. I suggest you guys to study every topic in detail mentioned in Digital Tut.
Hell Drangger, Thank for sharing.
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Hi friends, I will be writing my routing exam in 2weeks, can someone please send me the updated dumps
Hi friends, I will be writing my routing exam in 2weeks, can someone please send me the updated dumps.
my email: {email not allowed}
Failed today a lot of new questions !
Unknown, Can you specifically review about your exam, ex : drag anh drop, lab sim ?
Thank you so much!
12 to 15 New Multiple Choice Questions out 36 MCQ questions.
New Drag and Drops, even the old ones are twisted with change in words used.
Same Simulations.
Which makes it very hard to even get 600.
hi mr.Failed today, The dump do you have used?
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For Q1,
The question is asking about the type 4 LSA generated by R3. Keep in mind that because R5 is in a stubby area that R4 converts the type LSA to an inter-area route (Type 3).
Therefor you need to log into either R3 or R4 and note the link id of the Type 4 LSA that’s advertised by R3 first to ensure that you get the correct one when looking at the Type 3 LSA’s on R5.
Hello anyone does have a latest dumps? can i have a copy and send it to my email? ceejaygomez74 @ gmail . com THANK YOU verymuch
Failed the route exam with 640 last june 23.. I reviewed the 252 questions and practically memorized and understood all of it. Unfortunately most of the questions were new, a lot of drag/drop and those choose 2/3 questions. there were some AAA questions that I don’t remember that was even on the book, some ipsla questions and a lot more new stuff. Lab was PBR, Redistribution and OSPF.
Can someone give me some updated dumps? please send to my email – dlinuxuser1 @ gmail
Thank you and good luck to all who will be taking the exam.
Many people is fail, anyone passed please share latest dumps ?
thank !
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Hi all
For Question 2, isn’t A correct as well because there are no neighbor commands, hence R1-R3 has no neighborship?
i failed with 710 by 19th june, may anyone who passed share lastest dumps, 50% was new
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Hi Guys,
Please send me dumps of 149+41+15+183+56+82+32+8
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Hi Guys,
Please send me dumps of 149+41+15+183+56+82+32+8
to:
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Hi
please send me dumes of switching 300-115..
Are new dumps of Route available ? Does anyone have ?
Hi guys,
Are these the correct and valid dumps?
https://drive.google.com/drive/folders/0B-ob6L_QjGLpZEE0S2YxR3ZMUWs
I’d appreciate for your help and feedback.
2 months ago, my friend used 149+41+15 only and he passed with decent score.
Is it still valid?
who took exam last days? what labs are in exam now? thank you
I took 300-101 yesterday, labs are EIGRP Evaluation Sim, OSPF Evaluation Sim, Policy Based Routing Sim, EIGRP OSPF Redistribution Sim, OSPF Sim.
@Soleinu congratulations first of all. Please share the dumps you used for the exam
You can download this sim to practice at https://www.digitaltut.com/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
==========Hi All..Did you get GNS3 work for you?======
Hi Team,
CCNA will expire soon. Can anyone help me with latest dumps and email me at theprophesy16 @ yahoo.com? Thanks.
@Hi Soleinu…thanks for update, I would like to ask, the answers for EIGRP and OSPF evaluation sims are different as presented here am I right? For example OSPF evaluation sim:
Question 1
How old is the Type 4 LSA from Router 3 for area 1 on the router R5?
A. 1858
B. 160
C. 600
D. 1569
Answer: A
Answer A is no longer valid. There is different answer and you can see it in the same output of the command show ip ospf database
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Hello,
I begin to study CCNP Route , could you tell me if for that Lab OSPF Evaluation Sim the answers are differents from this Lab ?
What do I’m care about ?
Thanks for your help.
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