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 …)
@bodo1111 congratulation dude, you meant ospf sim or ospf evaluation sim ?
I passed the switch exam yesterday, now studying for 300-101 Route, can anyone please send me the valid dumps to mikeuthoff @ Yahoo . com Thanks in advance
Hi All,
I am planning to write exam in Aug 10. Can some one please send me the latest dumps to my email id. victory . karthi8 @ gmail. com
hello everyone.
which lab is coming in exam? do i prepare all lab given the pdf?
Hi SpeerGag,
I congraats on your switch exam, I have mailed you the valid dumps, i nalied my route exams yesterdays.check your mail.
-Mike
Mike, are you able to send me a copy as well brother?
just passed my 300-101 today and i had this lab on my exam. all the answers here are good but i notice something strange, when you run the sh ip int S1/1 on R3, it displays that that network type on that link is point to point and the timers displayed on that link R1-R3 are 10;40;40 which match with Answer C. but i advise you to step on Answer B as mentioned. that is what i choosed.
hie Armand. what other labs were in the exam?
Hi,
Would you send me the latest dump please. Google account janekurr1995
Huge thanks in advance
Hi,
Would you send me the latest dump please. janekurr1995 @ gmail . com
Huge thanks in advance
Hi Mike,
Would you send me the latest dump as well brother?
{email not allowed}
Hi Mike,
Would you send me the latest dump as well brother?
bluethunder1414 @ gmail . com
Hi Mike,
Would you send me the latest dump as well drazenmd @ blic . net
Hi mike !!
Would you send me the latest dump as well brother?
{email not allowed}
Hi mike !!
Would you send me the latest dump as well brother?
rauledmundo @ hotmail . net
Hi mike !!
Would you send me the latest dump as well brother? the first email address is wrong . Send to this please
rauledmundo @ hotmail . com
Hi All,
Can someone pls email me the valid dump at mirabela2000ng @ yahoo .com
Thanks
I am trying to understand ira’s point.
The ASBR-SUMMARY, LSA type 4 for area 1 is in R4
(On R4 do show ip ospf database, and it is link id 4.4.4.4 advertised by R3.)
So on R5 Summary Net Link, it is coming from the 4.4.4.4 link ID (not 3.3.3.3) that has the correct age time.
Gosh, can someone explain it better? Please?
Can anyone as to why we should use use GNS3 with version older than v1.0 to open this OSPF Sim??? (v0.8.3.1 for example).
i spent 10 minutes double-checking my version of the test that i just took. the non-broadcast link was from R1 to R3 (timers 30, 120, 120). i checked the router ids and the interfaces to make sure they changed this SIM. the link from R2 to R3 was point to point with timers of 10, 40, 40. for this reason i changed my answer from B to C. do you think this is correct answer? it was pretty obvious to me that answer B was not true on my version of the exam.
Im taking the exams in 2 weeks, done the Rene Molenaar Book and Pluralsight vids. Can someone be so kind and send me the latest dumps? gmail account jochemtuin. Thanks in advance
Hello Mike/friends,
Would you send me the latest dump 300-101 please?
extreme_z3r0 @ hotmail . com
@Q1 Again
The Evaluation Sim is a good one for learning OSPF from, I’ve spent a number of hours looking at this and the combination of LSAs. The Type 4 LSA is generated by the ABR where Type 5s are leaving that area. Awful way of describing it sorry but…. Area 2 is NSSA so by definition it will have external routes. It does not matter that there are no external routes the mere act of defining an area as NSSA is enough.With NSSA area the ABR for the area takes type 7 and converts to type 5 to the next area. At the same time the ABR sends a type 1 LSA with the E bit flag set to the next area. When the type 5 and the type 1 arrive at an ABR in that area that ABR sends a Type 4. You can lab this easy. The write up of the solution states that there is no Type 4s i the network but as you have pointed out this is incorrect.
So, Area 2 is NSSA, R4 effectively becomes a pseudo ABSR for the area sending the e bit on type 1s into Area 0. Area 0 R3 then receives the Type 5 and the e bit and create a Type 3, 4 which is sent into area 1.
I’ve made a lab up to test the behaviour across different types of area’s and NSSA area are the most interesting given the Type 7 and the relationship to Type 5 and where Type 4 gets generated.
Its difficult to explain but simply create a lab with 4 routers and 3 area’s all in a row. Review the LSA in the database along the way, then turn the left most area into NSSA and watch only the far right area get a Type 4…the middle area (being 0) will not see a Type 4 at all.
good day all.i wish us goodluck and success as we prepare and write our exams.hello mike can you please send me the latest dump,my email is {email not allowed}ks in advance
Hello Friends,
I see above we have valid dumps floating around. If possible can someone send me a copy of what they have please. I am currently woring on my ROUTE 300-101. Any help would be greatly appreciated. kevin . a . thomas 4 gmail .com
Ok, so here’s my 2 cents.
A. The neighbor command must be used on R1-R3 link to keep the adjacency up
B. The OSPF timer values of R2-R3 link are 30, 120, 120
C. The OSPF timer values of R1-R3 link should be 10,40,40
D. R3 must flood LSUs to all the routers on the network.
The correct answer is A. Here’s why. (hopefully digitaltut fixes/updates it).
Link R3-R1 is a non-broadcast network. OSPF over Non broadcast links has timers 30/120/120 and that’s exactly what we see in the config. Therefore answer C is not correct.
Link R3-R2 is a point-to-point network. OSPF over point-to-point networks has timers 10/40/40 and this is exactly what we see in the config (yes digitaltut, this is the output of R3(conf t)#sho ip ospf interface s1/0. Therefore answer B is not correct.
Then R3 is not a DR for all the network routers. This doesn’t even make sense.
Now regarding answer A. I am claiming it correct not because it’s the only one left, but because it makes sense. Just think about it – R3-R1 link is a NON BROADCAST network. What must be done, so that R3 and R1 establish a neighbor adjacency over NON BROADCAST network? That’s right, use neighbor command.
Note: the question doesn’t ask what needs done to fix a broken adjacency (if you run sho ip ospf neighbor you will confirm that it is already up and running between 3.3.3.3 and 1.1.1.1).
The question asks _what needs to be done to establish such an adjacency (over nonbroadcast in our case) in first place_ and keep it up.
Now regarding LSA Type 4. This one is a TYPO from cisco. There are no Autonomous System Border Router LSA’s in the R5’s database. Only Summaries from ABR R3.
I cant understand the first lab.
“. According to the “Age” column, this LSA was advertised 1858 seconds ago ” but as I know this value change every second, how is possibile that is the same number??
I agree with @begemot , the correct answer is A. I saw this too in my last exam on August
OK, but what change between R1 and R2 serial interfaces.
I’ve replicated this lab on gns3 and i cant understand why R2-R3 neighborship work without the neighbor command, it is also a NON BROADCAST network.
Hi
Can anybody please email me (abboudah76(AT)y aho0(DOT)C0m) the valid dump for route exam (300-101)?
Thanks in advance
Hello Friends,
Could you please email me the valid dumps for exam (300-101) kondalou2018 @ gmail.com
Hello everyone,
Would any one please send me the dumps for 300-101 or 300-115 at aachangazi @ gmail . com
Thanks in advance
hello everyone
Would any one please send me the dumps for 300-101 or 300-115 at jersonrhod.cabrera @ gmail . com
Thanks in advance
Hello!
Would anyone please send me valid dumps for 300-101 at xuargonis (at) hotmail . de
Thank you so much!
Where are the questions
Hello Friends;
could you please send me the valid dumps of exam 300-101.
nakhan78 @ gmail . com
hi all. i wrote my exams today and scored 876. got this ospf sim and as @begemot mentioned, A is the only option that makes sense. Choices B and C timers are wrong (compare to #show ip ospf int command) and R3 is not the DR for both link (Choice D). However, i could have gotten the same version of question like him and there could be other versions in there. nevertheless, make sure to issue #show ip ospf interface command on both serial interface to check and compare the timer values on all choices. good luck!
Hi Skith; will you plz provide the dumps for 300-101.
nakhan78 @ gmail . com
please send me the 300-101 dumps. today failure with 759. I need to pass..shaloncl @ gmail com
Admin, Please help me in finding the cisco ios file for my gns? Could not do the lab.
Hello everyone. Can some one send me the 300-101 dumps to huseinmalik at Gmail. :-). Thanks in advance!
HI everyone. I pass exam on the 25 of september. My scored 888. I used digitaltut only. In general, the questions was from MPQ and New Updates Q. I had PBR, Redistrubute, OSPF evaluate.
hi can any one confirm if answer B is still correct. The OSPF timer values of R1-R3 link were 30, 120, 120
Question 2
Check the serial links connected to R3. Which statements are correct?
A. The neighbor command must be used on R1-R3 link to keep the adjacency up
B. The OSPF timer values of R2-R3 link are 30, 120, 120
C. The OSPF timer values of R1-R3 link should be 10,40,40
D. R3 must flood LSUs to all the routers on the network.
when I check show int s1/0 and s1/1 i got the following:
The OSPF timer values of R1-R3 link were 30, 120, 120
The OSPF timer values of R2-R3 link were be 10,40,40
if some one could explain the correct answer. Thanks
@ max
CONGRATS on you passing the exam ,if its not too much to ask for ,could you please send me the valid dumps , my exam is due Sunday ,so this would be really appreciated
my email is : {email not allowed}
@ max
CONGRATS on you passing the exam ,if its not too much to ask for ,could you please send me the valid dumps , my exam is due Sunday ,so this would be really appreciated
my email is : sondus-95 at Hotmail
thank you in advanced
Hello everyone,
Would any one please send me the dumps for 300-101 or 300-115 at mohamad.hamdan1 hotmail.com
I’ve done the ROUTE exam three times in which I passed ROUTE almost 2 times.
I’ve got 3 times OSPF SIM, PBR and Redistribution.
For the OSPF SIM, I had three times these questions:
Q1 is the same, but doing sh ip ospf database shows like 5-6 IPs with an age of 1858, so you have to check carefully.
Q2 was always the following in my exam:
A. The neighbor command must be used on R1-R3 link to keep the adjacency up —-> This can be the answer. When using the show ip int, it shows adjacency count 1 and neighbor count 1?
B. The OSPF timer values of R2-R3 link are 30, 120, 120 —-> Router link shows 10,40,40
C. The OSPF timer values of R1-R3 link should be 10,40,40 —-> Router link shows 30,120,120
D. R3 must flood LSUs to all the routers on the network. —-> I don’t think this is the answer.
Q3 is the same
Q4 is the same (R5 has routing table with R5 and R6 in it)
Q5
@ max
Hi max,
Would you mind sending me please valid dumps for ccnp route , my exam is in two weeks, I’ll really be much appreciated your effort and congrats again. thanks buddy
my email is : cristianls79 at gmail.
thank you. Regards
Hi Guys,
I want pass the exam ccpn routing, someone that have 1 pdf with the las question, pleaseeee.
carlos_rodr7910*@*hotmail*.com
Thanks
Hi Max/ all
Please kindly help with Dumps 300-101 or 300-115 used as my CCNP would be expiring next month, i have bought some dumps which i’m told are not valid, pls share dumps with me
nosliw4u at *yahoo.com*
Thanks