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Thread: Does Router Broadcast or not ?

  1. #1

    Favorite 32 Does Router Broadcast or not ?

    Que.
    Does Router Broadcast or not ? and also solve my below questions.

    I am having a doubt regarding broadcasting done by router or not ?



    Suppose we are having this scenario.

    LAN1 { 172.19.1.1 ,172.19.1.2 ,172.19.1.4,172.19.1.8 } connected via S1
    LAN2 { 172.17.12.1 , 172.17.12.5 , 172.17.12.7 , 172.17.12.9 } connected via S2

    Now Consider Switch S1 and S2 and a router R.
    See this :-

    LAN1 <----S1----> R <-------S2----->LAN2

    I Hope the scenario is clear.
    Now if computer on LAN1 broadcasts a packet.
    It will also reach the Router.
    Packet is having IP address as broadcast address.

    The Question is Will the Router check the address in the routing table ?
    or simply drop the packet due to broadcast address.



  2. #2
    Ya, router checks the destination address of the packet in the routing table, to send the packet to that particular address.

  3. #3

    Re: Does Router Broadcast or not ?

    Hi..

    Routers don't participate in broadcasting, they simply drop the packets as soon as they notice a broad cast address. In other words broadcast domains are restricted to layer 2 devices. Routers dont generally participate in broadcasting/ They rather drop the packet which is broadcasted, That is how you prevent the broadcast packets from one network in this case LAN1 , from reaching another network LAN2.




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