RIP Questions
Here you will find answers to RIP Questions
Note: If you are not sure about RIP, please read my RIP tutorial
Question 1
What are two characteristics of RIPv2? (Choose two)
A.classful routing protocol
B. variable-length subnet masks
C. broadcast addressing
D. manual route summarization
E. uses SPF algorithm to compute path
Answer: B D
Question 2
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
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
After a RIP route is marked invalid on Router_1, how much time will elapse before that route is removed from the routing table?
A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 180 seconds
E. 240 seconds
Answer: B
Explanation
The invalid and flush timers start at the same time and run concurrently. So after a RIP route is marked invalid, it will take 240 – 180 = 60 seconds for that route to be removed from the routing table.
Question 3
Which three statements are correct about RIP version 2? (Choose three)
A. It has the same maximum hop count as version 1.
B. It uses broadcasts for its routing updates.
C. It is a classless routing protocol.
D. It has a lower default administrative distance than RIP version 1.
E. It supports authentication.
F. It does not send the subnet mask in updates.
Answer: A C E
Question 4
HQ(config)# router rip
HQ(config-router)# network 172.16.0.0
HQ(config-router)# exit
HQ(con£ig)# ip route 172.16.15.0 255.255.255.0 172.16.18.2 150
Assuming that the routing protocol for the entire network is RIP, and the RIP is configured with its default settings. You properly configure all links and all these links are functioning normally.
Regarding the network described which of the following statements are true? (Choose two)
A. The HQ router will prefer to use its S0 interface to reach E1 of the Branch router.
B. The HQ will prefer to use its BRIO interface to reach E1 on the Branch router.
C. The HQ BRI0 interface will be used to reach the Branch E1 network in the event the S0 link fails.
D. The HQ S0 interface will be used to reach the Branch E1 network in the event the BRI0 link fails.
Answer: A C
Explanation
The HQ router is configured with both static and RIP to reach 172.16.15.0/24 network so it has to use the Administrative Distance of each route to decide which route should it forward the packet to. The static route “ip route 172.16.15.0 255.255.255.0 172.16.18.2 150” is configured with an AD of 150 but the default AD of RIP route is 120 so the RIP path will be favored over static route.
Question 5
Which statement about RIPng is true?
A. RIPng allows for routes with up to 30 hops.
B. RIPng is enabled on each interface separately.
C. RIPng uses broadcasts to exchange routes.
D. There can be only one RIPng process per router.
Answer: B
Explanation
The Routing Information Protocol next generation (RIPng) is an interior gateway protocol (IGP) that uses a distance-vector algorithm to determine the best route to a destination, using the hop count as the metric. RIPng is a routing protocol that exchanges routing information used to compute routes and is intended for Internet Protocol version 6 (IPv6)-based networks.
RIPng is enabled on each interface separately. Below is an example:
R1(config)#ipv6 router rip 9tut //name the process RIPng 9tut
R1(config-rtr)#exit
R1(config)#interface E0/0
R1(config-if)#ipv6 rip 9tut enable //run RIPng 9tut process on E0/0
Question 6
A medium-sized company has a Class C IP address. It has two Cisco routers and one non-Cisco router.
All three routers are using RIP version 1.
The company network is using the block of 198.133.219.0/24.
The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM.
What is the best course of action if the company wants to have 40 hosts in each of the three subnets?
A. Convert all the routers to EIGRP and use 198.133.219.32/27,198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.
B. Maintain the use of RIP version 1 and use 198.133.219.32/27,198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.
C. Convert all the routers to EIGRP and use 198.133.219.64/26,198.133.219.128/26, and 198.133.219.192/26 as the new subnetworks.
D. Convert all the routers to RIP version 2 and use 198.133.219.64/26,198.133.219.128/26, and 198.133.219.192/26 as the new subnetworks.
E. Convert all the routers to OSPF and use 198.133.219.16/28,198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
F. Convert all the routers to static routes and use 198.133.219.16/28,198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
Answer: D
Question 7
The network shown in the exhibit is running the RIPv2 routing protocol. The network has converged, and the routers in this network are functioning properly.
The FastEthernet0/0 interface on R1 goes down. In which two ways will the routers in this network respond to this change? (Choose two)
A. All routers will reference their topology database to determine if any backup routes to the 192.168.1.0 network are known.
B. Routers R2 and R3 mark the route as inaccessible and will not accept any further routing updates from R1 until their hold-down timers expire.
C. Because of the split-horizon rule, router R2 will be prevented from sending erroneous information to R1 about connectivity to the 192 168.1.0 network.
D. When router R2 learns from R1 that the link to the 192.168.1.0 network has been lost, R2 will respond by sending a route back to R1 with an infinite metric to the 192.168.1.0 network.
E. R1 will send LSAs to R2 and R3 informing them of this change, and then all routers will send periodic updates at an increased rate until the network again converges.
Answer: C D
Question 8
What is the default routing update period for RIPv2?
A. 15 seconds
B. 30 Seconds
C. 180 Seconds
D. 240 Seconds
Answer: B
Question 9
What two things will a router do when running a distance vector routing protocol? (Choose two)
A. Send periodic updates regardless of topology changes.
B. Send entire routing table to all routers in the routing domain.
C. Use the shortest-path algorithm to the determine best path.
D. Update the routing table based on updates from their neighbors.
E. Maintain the topology of the entire network in its database.
Answer: A D
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 …
Hi Scott,
Option B is not valid in Question 9 because it says that distance vector routing protocol send entire routing table to all routers in the routing domain and that’s not true. Distance Vector Routing Protocol only send routing table to its directly connected neighbors not to the entire routing domain.
for further information, feel free to contact on rizi.jbutt@gmail.com
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
@priya: Please read the explanation of this question here: http://www.9tut.com/ccna-operations-2 (Question 5)
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.