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Tuesday, October 15, 2019

Routing Information Protocol (RIP) Interview Questions and Answers

October 15, 2019
Routing Information Protocol (RIP) Interview Questions and Answers




 Q :- What is the destination IP address of a Rip v1 packet
Ans :- Rip v1 is a broadcast packet. The destination IP address of a Rip v1 packet is 255.255.255.255

Q :- What is the main difference in RIP v1 and v2 packet
Ans :- RIP v1 does not include the subnet mask information inside the packet. It does not support classless addressing. RIP v2 includes the subnet mask information inside the packet.

For example assume that the sub netted network 192.168.1.64/26 is configured on a RIP enabled router. If RIP v1 is configured, the route would be advertised as 192.168.1.0 ( It would take the default subnet mask of /24 and not /26).
If RIP v2 is configured, the subnet mask inforamtion (/26) would also be advertised in the route.

Q :- If a Rip v2 router advertise it’s route, would it be received by all the devices on the network
Ans :- Rip v2 is multicast. So the route advertisement would be received only by devices which has Rip v2 enabled. If the advertisement was Rip v1, then it would be received by all devices on the network as Rip v1 is broadcast.

Q :- How can a Rip route advertisement be blocked on a specific interface
Ans :- By using the passive interface command.

Q :- Which transport layer protocol does RIP use and the associated port number
Ans :- UDP – Port 520



Q :- If a static route and a Rip learnt route is available on a router which entry would be chosen by the router to forward the packet
Ans :- Static route would be chosen since it has lower administrative distance than Rip

Q :- What is the major benefit of dynamic routing protocol like RIP over Static route
Ans :- In a static route, the route entries has to be manually configured on the router. Whereas in a dynamic routing protocol like Rip, routes are learnt automatically.

Q :- Can a subnet mask information be stored in a Rip v1 packet
Ans :- Rip v1 is a classfull routing protocol. It does not understand classless concepts like Subnets. So it is not possible

Q :- Is a subnet mask field available in a Rip v2 packet
Ans :- Rip v2 is classless routing protocol. A rip v2 packet has a field to include the subnet mask information.

Q :- What is the administrative distance of Ripip
Ans :- 120

Q :- What is the multicast address that Rip v2 uses
Ans :- 224.0.0.9

Q :- What is route poisining?
Ans :- Route Poisoning: It is the process when a router advertise its connect network metric as 16 hop counts. Generally it happens if a link goes down then the router send a triggered update marking the down network as 16hope count, which is called as Route Poisoning.


Q :- What is split horizon?
Ans :- Split Horizon: Its very simple, it states that any router which receives an information on a link will not send the same information back on the same link.

eg.
If router A receives an update(U) on its interface 'a' from router B,
according to SH, router A will not send same information(U) back on the same link(a) which it received from B.

Q :- Utiizing rip,what is the limit when it comes to numbers of hops?
Ans :- You can use only 15 hop4

Q :- Multicast adress of rip v2?
Ans :- 224.0.0.9

Q :- what is the difference between Rip v1 and v2?
Ans :- RIPv1
* Doesn't support no-auto summarry
* Doesn't support VLSM
* Doesn't support authentication

RIPv2
* supports no-auto summarry
* supports VLSM
* supports authentication

Q :- Administrative distance of rip?
Ans :- 120

Q :- Can we use rip as a scenario having more than fifteen routers?
Ans :- Yes, if connected with BMA network

Q :- What is the difference between rip and ripng?
Ans :- RIPng is for IPv6 and RIP is for IPv4.

Q :- What is RIP what is the use of RIP?
Ans :- RIP (routing information protocol)is a distance vector dyanamic routing protocol. It is used where we have less no. of routers. Its max hop count is 15. It broadcast its entire routing information in every 30 seconds.It is a class full routing protocol.RIP version 2 is a classless routing protocol.



Q :- Route invalid timer?
Ans :- Determines the length of time that must elapse (180 seconds) before a router determines that a route has become invalid. It will come to this conclusion if it hasn’t heard any updates about a particular route for that period. When that happens, the router will send out updates to all its neighbors letting them know that the route is invalid.

Q :- Holddown timer?
Ans :- This sets the amount of time during which routing information is suppressed. Routes will enter into the holddown state when an update packet is received that indicated the route is unreachable. This continues either until an update packet is received with a better metric or until the holddown timer expires. The default is 180 seconds.

Q :- Route flush timer?
Ans :- Sets the time between a route becoming invalid and its removal from the routing table (240 seconds). Before it's removed from the table, the router notifies its neighbors of that route's impending failure. The value of the route invalid timer must be less than that of the route flush timer. This gives the router enough time to tell its neighbors about the invalid route before the local routing table is updated.

Q :- RIP Timers?
Ans :- RIP uses four different kinds of timers to regulate its performance

Q :- Route update timer?
Ans :- Sets the interval (typically 30 seconds) between periodic routing updates in which the router sends a complete copy of its routing table out to all neighbors.




That's it
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