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 difference between URLs https://www.digitaltut.com/ospf-evaluation-sim and https://www.digitaltut.com/ospf-evaluation-simulator?
The second one has “simulator” in full while this page is just “sim”, but this page has WAY more info. Not sure if I’m hitting all the correct sims or not!
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Passed, question mentioned on this site are valid, No issues noticed with adding the trunk allowed Comand 1,21-23. No issues noticed either when adding the portchannels on the interfaces, note the tab autosummarize was working and helped me a lot. Labs drag and drops are stil valid
Hi guys,
my CCNP will expire in 27/01/2018, I’m taking 300-101 and I don’t have much time, full time work + xmas
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I failed today and have a few days left to retake.
I Had studied 2 books (official + Rene), done plenty of labs in GNS3 and it seems
BTW… pass4sure did not help!! actually was a waste of time and money (I wanted to make it sure and it added more confusions than help)… Not even a question from there, I just failed for a few questions and even one was close from those!
Today, I found Q1 – Q3.
In Q2 unable to show interface command on R3, try execute the show interface command on R1 and R2 to get the answer.
Passed the exam today.
Pay attention to Q2. If you check timers from R3 both answers B and C (in my case) were correct, but from R1 and R2 outputs the network types were different comparing to R3 (along with timers) so A answer is correct in this situation.
hi,
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i have dump for Pass4Sure i used one if any one need it just post to me
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Dear colleagues which already passed the exam,
What answer did you choose for Question ? Was it the timers 30-120-120 or was it the neighbour command that needed to be used ?
Thank you in advance for your asnwer.
Can I find somewhere the questions belonging to the sims? Thanks!
Did anyone write the CCNA ROUTE exam recently? Please share your experience and help us. It’ll be great, if you could tell which dumps did you refer to and if questions came from that or there were other questions also. PLEASE!!!
Did anyone write the CCNP ROUTE exam recently? Please share your experience and help us. It’ll be great, if you could tell which dumps did you refer to and if questions came from that or there were other questions also. PLEASE!!!
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I applaud each and every one of us who gets up one more time than we fall down! Like most of you, I’ve got CCNA, CCNA Security and now, trying to take on 300-101, which I’ve failed once. I’m lucky. I know EXACTLY why I failed the exam. The scenarios opened up and, the absolute most BASIC piece of information slipped away. “How do I open OPSFv3”? I know what it is, a ton about it! Is it “ipv6 ospfv3 router”? No. um, “router ospfv3”? Sh*t!… Okay, each and every scenario, that least tiny bit of fear and time was ate up as if minutes turned into seconds. I studied over 500 exam questions and took notes on two major works for this exam from Cisco Press and Ken Wallace. IF you fail the exam, it will be cause of the most very basic START line into the scenarios. Prep yourself! “How do I open OSPFv3 to start?” “What four commands do I need to have down perfect, and understand their results for each IGP?
#show ip eigrp topology
#show ip route
#show ip ospf database
Seriously folks, this CCNP 300-101 will be my 21st professional exam in 20 years. I’ve had a long career as a system admin with Microsoft and now, moving into Cisco. Unlike Microsoft, who screws with people, Cisco is honest! You must be honest, at the most basic level! It’s the BASICS…and we’ll do fine.
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Can someone post tips on what to prepare for in the CCNP ROUTE Labs?
If you miss one of the four questions on this simlet, do you fail the entire thing?