Short note on RIP with Interview Questions

Short note made for quick study for RIP

  • The Routing Information Protocol (RIP) is a distance-vector routing protocol
  • RIP takes the hop count as a metric.
  • RIP have two versions RIP v1 and RIP v2
  • In IPv6 RIP is called as RIPng
  • RIPng must be enabled in interfaces in IPv6
  • RIP sends out the full routing table every periodic update
  • RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from the source to a destination.
  • A maximum number of hops allowed for RIP is 15. This hop limit, however, also limits the size of networks that RIP can support.
  • A hop count of 16 is considered an infinite distance
  • RIP implements the split horizon, route poisoning and also hold down mechanisms to prevent incorrect routing information from being propagated
  • RIP router transmitted full updates every 30 seconds
  • RIP uses the User Datagram Protocol (UDP) as one of its transport protocol, and is assigned the reserved port number 520
Interview Questions

  • What is Route Poisoning?
  • What is Split Horizon ?
  • Utilizing RIP, what is the limit when it comes to number of hops?
  • What is the difference between RIP V1 and V2 ?
  • Mulitcast address of RIP v2 ?
  • Administristative distance of RIP ?
  • Can we use RIP in a scenario having more than 15 routers ?
  • What is the difference between RIP and RIPng?

If you need to know answer for any of the above question feel free to ask in comment section
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  1. Please let me know the answers of above questions.

  2. please provide answer of above questions

  3. 1. 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.

    2. 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.
    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.

    3.You can use only 15 hops.

    * Doesn't support no-auto summarry
    * Doesn't support VLSM
    * Doesn't support authentication

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


    6. 120

    7. Yes, if connected with BMA network

    8. RIPng is for IPv6 and RIP is for IPv4

    1. Please tell me that what is BMA network

    2. BMA stands for Broadcast Multi-access Network, where more than two routers connected using a Switch with in a same network

  4. also remember ripv1 is classfull and ripv2 classless

    1. RIP V2 is by default Classfull but we can make them classless

  5. BMA Broadcast Multi Access
    RIP&RIPv1 supports Contigeous network
    RIPv2 Supports Contigeous/discontigeous/vlsm

  6. BMA- Broadcast Multi Access network.
    NBMA- Non Broadcast Multi Access network.
    RIP Sends broadcast and receives Broadcast Multicast And supports Contiguous Network.
    RIPv1 sends broadcast and receives Broadcast and supports C.N.
    RIPv2 sends Multicast and receives Multicast And supports Contiguous/discontiguous/Vlsm.

  7. RIP
    Open standard
    its a classfull routing protocol ( do not advertise subnet mask along with the update ) version 1
    Metric - Hop count
    Max hop - 15
    Max routers - 16
    Uses broadcast ( verison 1)
    RIP uses UDP and Port Number - 520
    RIP Timers

    Update Timer - 30 sec
    Invalid Timer - 180 sec
    Flush timer - 240 sec
    Hold down timer - 180 sec

    Convergence is slow - 240 sec
    Administrative distance - 120 sec
    4 equal cost load balancing ( i am not sure )

    RIP V1

    no authentication
    uses broadcast address
    Classful routing

    RIP V2

    Supports authentication
    uses mulitcast address -
    Classless routing ( advertises subnet mask along with the update )