RIP Questions

Q9:Why is option B not a valid answer?

Yes, why is B not a correct answer for Q9

I think this is a better explanation for question 2:

1. Router believes a network becomes unreachable.
2. Router simultaneously starts the invalid timer (180 seconds) and flush timer (240 seconds).
3. At the 180 second mark, the invalid timer expires and the router declares the route invalid.
4. An additional 60 seconds elapse.
5. At the 240 second mark, the flush timer expires and the router removes the route.

ScottfromSouthAfrica/BillyBob,

I believe it’s because a router will only send a complete routing table to its peers. Not its peers’ peers.

q9 – eigrp is a distance vector (althought called a hybrid), and it does not send the hole table

B is incorrect on question 9 because Distance Vector routing protocols only send the information to directly connected routers.

Additionally, I’ve never heard of a “routing domain.” Curveball.

Q7 – why B is not the correct answer ?

Q7 – I was wondering that too. Doesn’t the Split Horizon Rule get suspended in that case and “Poison Reverse” kicks in, which advertises a poisoned route?
Thanks in advance.

got it ! within the hold-down timer, if an update is received from a different router than the one who performed route poisoning with an equal or poorer metric, that update is ignored. if the update is received from the original router that performed the route poisoning it is accepted.

…When using static routes one of the two following commands is used …………Router config ip route destination network subnet mask … IP address of next hop neighbor administrative distance permanent …Router config ip route destination network subnet mask …

passed today with a 920. Had a question like this:

After you enter a SINGLE command “router rip” what does the router do.

Answer is : It will enable RIP but RIP will not do anything else (since you didnt add any networks to advertise)

yes you right…router rip then enter….

Q4: Why is S0 the preferred method if it’s AD is higher than RIPs 120?

@steven
because a smaller AD is a better AD

Ok I misunderstood the question. My question now is do routers prefer serial connections vs ethernet/fast ethernet connections?

If all given info is the same and the ADs are manually configured to both be 150 which interface will the router default to?

Just trying to understand why S0 is the preferred method vs BR10.

@steven
no, there is no such criterion for preference.
they could choose ethernet over serial based on the link configured speed.

if the BRI interface was leading to a network and the AD was 150
and
if the serial interface was leading to the same network and the AD was 150
then the router would load-balance and send packets over both interfaces.

i need help regarding question 8. Pass4sure has a question like this and the answer is 240. Please give me an explanation anybody

Question 8
What is the default routing update period for RIPv2?

A. 15 seconds
B. 30 Seconds
C. 180 Seconds
D. 240 Seconds

It is asking what the default update time is, which is 30 seconds. Now if it was asking what the default flush timer is, then the answer would be 240 seconds. There is also a invalid timer, which the default is 180 seconds. What happens is that the router updates every 30 seconds and if an update was not received to refresh an exiting route with in 180 seconds, the metric would be set to 16 (Infinity). Then this is when the flush timer comes into play because if an update has not been received within 240 seconds, then the route would be removed (flushed) from the routing table.

D. 240 Seconds
Test with Packet Tracer

By default, RIP sends updates every 30 sec

You can use the command “show ip protocols” to confirm :

#show ip protocols
Routing Protocol is “rip”
Sending updates every 30 seconds, next due in … seconds ———
Invalid after 180 seconds, hold down 180, flushed after 240
…
…
Distance: (default is 120)

Note that the Timers values can be changed manually if needed (You do not have to do that for your CCNA):
Router_R1(config)#router rip

Router_R1(config-router)#timers ?
basic Basic routing protocol update timers

Router_R1(config-router)#timers basic ?
Interval between updates

Router_R1(config-router)#timers basic 10 ?
Invalid
…

Router_R1(config-router)#timers basic 10 150 150 200
This will set Updates timer to 10 sec, Invalid 150sec, Holddown 150sec and Flush 200sec.

To check the values after issuing the command above:
Router_R1#show ip protocols
Routing Protocol is “rip”
Sending updates every 10 seconds, next due in 8 seconds
Invalid after 150 seconds, hold down 150, flushed after 200
…

Q4
Static Route 150 AD
Rip Route 120 AD
The lower the AD will be preferred!
So the answers should be B & D
Static route is used as a backup route..

For question 4. The administrative distance of a connected route is “0”. Wendell Odom ICND2 pg.317. That’s why the question is correct.

Q4
My bad…
Router HQ learns about 172.16.15.0 also from RIP!
statement ” network 172.16.0.0 “

Q4
I don’t understand why HQ router will prefer to use its S0 interface to reach E1 of the Branch router.
Using RIP, the HQ router will learn 2 routes to the E1 interface of Branch router:
– via S0 with 120/1
– via BRI0 with 120/1
So why S0 prefered over BRI0 ?

Q4 I think the question is not written correctly.
I believe they meant to use RIPv2 since they are using VLSM and I don’t think the network would function correctly using RIPv1 since it does not recognize VLSM.
It seems they meant to emphasize the Administrative distance knowledge you should know that RIP is 120 so that would be preferred if the network was configured right.

@nkhfromindia

Yes but EIGRP is also not sending periodic updates – so in this case the answer #1 is not valid, based on your logic.

DVPs are not sending the entire routing table – for example they wont advertise those routes on the interfaces they have learned about them. So the “weak” point here is the word – entire.

:Matt

S0 cost 0 as it is directly connected
..
0
1
5
90
110
120
..

..sorry. AD .. Administrative Distance 🙂

Q6
Why not go with B?
Doesn’t EIGRP work and Cisco loves it to no end?

I appreciate your response

Q6
Sorry; I forgot to read the first line of question that said “and one NON-Cisco router”

:Josepf

1st: RIPv1 doesn’t support VLSM
2nd: NON-Cisco environment doesn’t support EIGRP

for Q7 my answer is B &D,but 9tut says C,D.Can any one explain me clearly.thanks in advance

Passed ICND2 today with 944!! I didn’t have any of these questions

@priya
C is split-horizon and D is path poisoning. Two ways of preventing incorrect routing table entry.

i will be sitting for the exams next month,anybody with the latest ccna dumps.
agutumil@yahoo.com
Thanks in advance

Q1… Isn’t one of the characteristics of Ripv1 is that it is classful, why can’t A be also correct?

@kevin
questions asks about RIPv2. please pay more attention 🙂

Q1 : manual route summarization is not the default (I believe you need to send the “no auto-summary” in order to stop summarizing automatically so the answer is a bit on the edge, isn’t it ?
thanks

I have passes the exam with 944 marks none of them questions came into my exam.

I think Q2 is wrong. I’ve tested with packet tracer and a stopwatch. When a route fails, it is marked as invalid after 180 seconds of no update activity. A “possibly down” message appears in the routing table. Then, flush timers starts to count, and counting from now, the route is removed after 240 seconds. Stopwatch tested. So, after a RIP update is marked as invalid, router counts to 240 seconds to remove the route: answer E. In fact, in jericho dump (or collisio, i’m not sure), the correct answer is 240
This page also explains very well: http://blog.ine.com/2010/04/15/how-basic-are-rip-timers-test-your-knowledge-now/

passed with 944 today. none of these were on my exam.

Passed ICND2 today with 986/1000 🙂

none of these were there

Q2 is not correct in my opinion.
I have made simulation this scenario in Packet Tracer.
The results says than timers are not run concurrently.
When the route marked as “possibly down” then additional 240 seconds take to remove route from routing table.
So, summary interval before last update and removing from routing table is 180(invalid timer)+240(flush timer)= 420 seconds

Regards,
Alexey

Q7 — I believe answers B and C are correct. Why would R2 send a route back to R1 with an infinite metric to the 192.168.1.0 network? R1 knows it’s down. I stick with B and C.

is there any newer exams??

@Alex II

The holddown timer and flush timer start at the same time. As soon as the 180 seconds is up on the holddown timer, the flush timer continues another 60 seconds (total 240 seconds)

Remember that even with Packet Tracer or GNS3 that it is still a simulation, and may yield unexpected results. It also depends on what IOS those simulations are running.

Q7 the answer D is incorrect! When R1 LAN interface fails, it removes its connected route from its routing table. Then it advertises this route with an infinite metric to R2. R2 keeps this route with an infinite metric, until removed later. And yes B is correct as it’s what holddown timer is about. A is wrong because it’s talking about EIGRP. E is wrong too because it’s talking about OSPF.

So the correct should be B and C. So I agree with Bob too!

Forget everything I post. I didn’t notice the explanation page for this Q. Really good stuff!!!! I didn’t know anything about poison reverse until now!

hello! it is the http://www.examcollection.com has be remove or not hey,any one can inform me

Passed ICND2 today with 972!!!! No RIP question there.

Hi there, I found your web site by way of Google at the same time as searching for a related topic, your site came up, it appears great. I have bookmarked it in my google bookmarks.
http://newhermes.allmyblog.com/

Itˇs actually a great and useful piece of info. Iˇm glad that you simply shared this useful information with us. Please keep us informed like this. Thanks for sharing.
http://hermesnatural.wallinside.com/

Guys regarding question 9

EIGRP is a distance vector routing protocol right?But if I am not mistake it does not send periodic updates regardless topology changes.I am wrong?Why is A correct?

Q. 9. I guess its an old question and its wrong nowdays. I know that Cisco used to call EIGRP a hybrid routing protocol in the past and in recent years they have turned to categorize it as an distance vector routing protocol.

In Question 1 why it is D . RipV2 also do auto summarization no ?

Q4 – ambiguous if you ask me!

Ok, it is obvious that this is a VLSM network just by looking at it. However, not implementing the ‘version 2’ command on the console can throw a few of us off especially when the question clearly states that RIP is configured with the defaults! Remember, RIP by default runs as v1 not v2 – well, at least on the routers I have access here at home running IOS 12.4 (25d) on a c2610xm!

To me, just those commands and stating that RIP is running with the defaults made me assume that this was configured for RIP v1 and so was wondering how it was indeed working!

Also…

I also discovered that the command:

ip route 172.16.15.0 255.255.255.0 172.16.18.2 150

is not being accepted (I’ve set this scenario up in my simulator using a c3725 IOS image). The only way I could get similar results (i.e force router to prefer 172.16.16.2 instead of 172.16.18.2 as the next hop to 172.16.15.0/24) was to enter a static route with a lower AD for 172.16.16.2, namely

ip route 172.16.15.0 255.255.255.0 172.16.16.2 100

I believe the reason is that RIP tosses out any routes (including static ones???) that have lower AD than those already in the routing table!

Interesting!!!

I believe Question 7 answer C is incorrect. The correct answer should be B.

@ noname :
option B cannot be correct becaus if R2 and R3 get an update with a better metric than the originally recorded metric ,the hold down timer can be RemoVED AND it can accept other routes which have routing to R1.

Q4.
Anybody notice that static route is configured with /24 mask. As such it is the most detailed (having longest prefix) and should prefered regadless AD. Look for 192.168.30.6/32 in my test:
192.168.30.0/24 is variably subnetted, 3 subnets, 2 masks
S 192.168.30.6/32 [150/0] via 192.168.30.1
R 192.168.30.4/30 [120/1] via 192.168.30.1, 00:00:25, Serial0/0
C 192.168.30.0/30 is directly connected, Serial0/0
S 192.168.2.0/24 [150/0] via 192.168.30.1

ups, ignore this. All networks are /24, thus same prefix length, so AD rule applies.

I think Q9 is wrong. Copied from cisco netacad:
“EIGRP is a Cisco proprietary distance vector routing protocol. EIGRP has these key characteristics:
It can perform unequal cost load balancing.
It uses Diffusing Update Algorithm (DUAL) to calculate the shortest path.
There are no periodic updates as with RIP and IGRP. Routing updates are sent only when there is a change in the topology.”
So A is not correct. Could it be C?

@Cid
Your quote says there are no periodic updates with EIGRP, as there are with RIP. So, RIP has periodic updates, EIGRP does not.

guys
Q6 – why on earth the answer is rip 2 (D) ? That’s stupid to choose EIGRP choice (C) on the “Rip questions” page anyway, but I thought EIGRP is ideally a better protocol than rip , provided that the subnet numbers, prefix are correct. can someone explain me why the company is not using eigrp instead ??

answer to myself … non-cisco router ..

Q:7 .. C and D are 100% correct.

Split horizon rule is still active until R2 receive infinite ( 16) from R1. Once it receives the infinite metric to LAN (192.168.1.0), it is only then it will ignore the split horizon rule and will send the update of 192.168.1.0 to R1 with infinite metrics.

This is also called Poison reverse

pinkman re Q6……. ans to your query – 1 router is non-cisco. eigrp is a proprietory cisco protocol. hope this helps.

Guys,

Q4 – Key point!.. “Default settings”, it means that RIP will choose the closer (less hops) network to reach Branch E1, and one thing you should keep in mind, going thru your ISDN usually is a longer path (a lot of devices), so what;s the concept for RIP?, the fewer devices (usually routers) the better!!!… this is for A, as for C, that;s basically a “backup” link in case your primary fails!

Regards!

@Charles, i dont believe RIP sees what devices it goes through in the ISDN network, therefore RIP considers both paths as the same hop count.

Woah this blog is magnificent i really like studying your articles. Keep up the great work! You recognize, lots of individuals are searching around for this information, you can help them greatly.

@pinkman

1. EIGRP requires greater processing, memory, and it’s Cisco-proprietary.

2. Other staff may not know how to configure EIGRP as they may have been workplace-trained, rather than Cisco-certified. Alternatively, they may have a different networking qualification that doesn’t cover EIGRP.

3. All you know from the question is that RIP currently functions on the router, and that the subnets for RIPv2 are suitable for the organisation’s goals.

4. Additionally, in a real-life environment, you would need to get such a significant change approved, and your boss wouldn’t be too happy about all the downtime.

Usually the best answer comes down to simplicity and common sense.

^ Having said all of that, I have had an ACL question that needed Internet access denied to a particular host. However, a subnet on the interface of a further-away router connected to a server farm, which of course COULD contain internal web servers.

Despite this, the answer was to apply the extended ACL closest to the source. In this case, the rule of extended ACLs was applied by ASSUMING the server farm didn’t have a web server. Experience is essential, which is where these forums come in handy; sometimes being knowledgeable about Cisco simply isn’t enough to get the mark you deserve.

Hello! I just would like to give an enormous thumbs up for the fantastic info you have here on this post. I will probably be coming back to your blog for a lot more soon. jordans cheap http://jordanscheapmmi.snappages.com/blog/2013/07/20/the-way-to-find-and-pick-a-child-identify

There are actually some fascinating points in time in this post but I do not know if I see all of them center to heart. There’s some validity but I will take hold opinion until I appear into it further. Wonderful write-up , thanks and we want a lot more! Added to FeedBurner as well jordans cheap http://jordanscheapmmi.hazblog.com/Primer-blog-b1/Extra-Storage-Tips-For-the-Mudroom-b1-p2.htm

Just wrote my ICND2 today, and i got 902/1000.. Question 3 was in the exam.. Thanks to the 9tut team..

Question 7, C & D answers are correct as provided by 9tute. took me a while and going back to material to figure our Q7 . 9tute has also provided some explanation here: http://www.9tut.com/ccna-operations-2, but here is the clear detail from cisco press book regarding answer B and why it’s not correct:

Hold-down timer:
After hearing a poisoned route, start a hold-down timer for that one route(the route that is considered down).

Until the timer expires, *do not believe any other routing information about the failed route* (because believing may cause a routing loop to occur)

However, information learned from the neighbour that *originally advertised the working route can be believed* even before the hold-down timer expires. (so it’s saying yes you can trust a information coming from R1 even before the hold-down timer expires, as it is the router that originally advertised about this particular route)

HTH

Q2 is just plain WRONG! The CORRECT answer is D, 240 seconds, the value of the Flush timer. After 180 seconds, the route continues to exist in the route table, and will be advertised as unreachable with a metric of 16. Then, after the flush timer expires (60 seconds later), the route wil be removed from the table. 180 + 60 = 240 seconds. 180 PLUS 60, NOT 180 MINUS 60. True and accurate.

Meant to say NOT 240 MINUS 180.

@Router.Maestro

Router_1# show ip protocols
Routing Protocol is “rip”
Sending updates every 30 seconds, next due in 8 seconds
Invalid after 180 seconds, hold down 180, flushed after 240

After a RIP route is marked invalid on Router_1, how much time will elapse before that route is removed from the routing table?

Answer: B (60seconds)

<> means that after 180seconds pass it turns to <> + 60seconds no response is 240seconds <> removed from the routing table. So this 240seconds mean 180secs of Invalid plus 60secs to become 240.

Correction of last two lines

180seconds means that after 180seconds pass it turns to -Invalid- + 60seconds no response is 240seconds -Flushed- removed from the routing table. So 240seconds mean 180secs of Invalid plus 60secs to become 240 – Flushed-.

None of these were on the exam today. Passed with 916

Fail. Took the supposed ICND2 640-816 today and there was nothing like the material contained on this site. No VTP, No VLSM, No Drags and Drop (except 1, had Split Horizon), no ACL or NAT. It was all about SNMP and Netflow. 2 Different SIMS OSPF and EIGRP (not on this site or dump) A lot IPV6. I nailed ICND1 exam but this wasnt the test I prepared for. Please reply.

For some reason my exam overlapped and I got 200-100. Didnt know was there already and Fail. 640-816 next Monday.

@Thyreme … RIIIIIIGGGGHHHHTT! Got it. After the route is marked invalid (180 sec), when will it be flushed? In 60 MORE seconds, or Flush Timer of 240 seconds. Sneaky, tricky, not-so-well-worded Cisco exam questions!

Hey guys .. if you tried to add an ip address to the interface and you got error message “% Invalid input detected at ‘^’ marker” ignore this message and then check the running-config.

What university do you go to? http://www.skinspaaustin.com/prednisone/ prednisone 10mg reporting of results, teaching and research. Uniform data management and

Very interesting tale http://www.haines.ak.us/minoxidil/ where can i buy minoxidil vii. If points iv – vi can not be done, contact Sector Services (0800 243 666) to apply for a RISK

A law firm http://www.classicvoice.com/bimatoprost/ lumigan bimatoprost Video output image ¥ Is the video output type set to the PAL?

Accountant supermarket manager http://bomconselho.net/buydilantin/ iv dilantin the midriff, leather skirts/pants, clothing with frayed hems.

Recorded Delivery http://catdancercorporation.com/buyflagyl/ where can i buy flagyl er encountering a way of doing, organizing, perceiving or valuing things which are different from

I love this site http://bradfordgraves.com/buylotrel/ buy lotrel PHP, its practitioners and providers need in order to provide care.

http://www5.big.or.jp/~mabi/morningBBS/chanel-90wy8421.htmlシャネル 長財布
iwc 価格 http://www5.big.or.jp/~mabi/morningBBS/iwc_j8arns9av.html

I work with computers http://www.euniceproductions.com/pixelmaniacs/ dapoxetine trial pack necessary to allow time for modification of behavior. Daily logs, mid-rotation evaluation

In a meeting http://www.ideapsikoloji.com/biz-kimiz/ cytotec order Video output image ¥ Is the video output type set to the PAL?

I quite like cooking http://www.fiendishsudoku.com/igt-slots-aztec-temple/ free aztec temple slot machine pharmacist’s responsibility to obtain it.

Could I have an application form? http://www.ucheducationcentre.org/igt-slots-candy-bars/ igt slots candy bars FOCUS: Distribution expectations filling automated dispensing PM

What sort of work do you do? http://youkali.com/?page_id=16 cost erythromycin including inventory, payroll, third party reimbursement and P & L statements.

I’m about to run out of credit http://dorothy-gish.com/can-i-pay-someone-to-do-my-online-class/ bestessays.com 6One-pushTo set the push-set white