1) Point to Point Network
--> Default Network Type on Serial, Frame Relay interfaces in OSPF.
--> Uses 224.0.0.5 and unicast for communication with neighbor.
--> Does not have DR/ BDR Election
--> Hello Timer is 10 Seconds and Dead Interval is 40 Seconds.
--> Next Hop Router will be the Router from which we are receiving the update.
2) Broadcast
--> Used when all the routers are connected via ethernet segment or via switch.
--> Uses 224.0.0.5 and 224.0.0.6 for communication with neighbor.
--> Have DR/ BDR Election( Based upon Priority and Router-ID in case of same priority).
--> Hello Timer is 10 Seconds and Dead Interval is 40 Seconds.
--> Next Hop Router will be the Router that is originating the update.
3) Non Broadcast
-->Used when all the routers are connected via Frame relay switch.
--> This network type is used on the network which does not have multicast / broadcast feature.
--> Have DR/ BDR Election( Based upon Priority and Router-ID in case of same priority).
--> Hello Timer is 30 Seconds and Dead Interval is 120 Seconds.
--> Next Hop Router will be the Router that is originating the update.
--> Does not have DR/ BDR Election.
--> Hello Timer is 30 Seconds and Dead Interval is 120 Seconds.
--> Next Hop Router will be the Router from which we are receiving the update.
--> Default Network Type on Serial, Frame Relay interfaces in OSPF.
--> Uses 224.0.0.5 and unicast for communication with neighbor.
--> Does not have DR/ BDR Election
--> Hello Timer is 10 Seconds and Dead Interval is 40 Seconds.
--> Next Hop Router will be the Router from which we are receiving the update.
2) Broadcast
--> Used when all the routers are connected via ethernet segment or via switch.
--> Uses 224.0.0.5 and 224.0.0.6 for communication with neighbor.
--> Have DR/ BDR Election( Based upon Priority and Router-ID in case of same priority).
--> Hello Timer is 10 Seconds and Dead Interval is 40 Seconds.
--> Next Hop Router will be the Router that is originating the update.
3) Non Broadcast
-->Used when all the routers are connected via Frame relay switch.
--> This network type is used on the network which does not have multicast / broadcast feature.
--> Have DR/ BDR Election( Based upon Priority and Router-ID in case of same priority).
--> Next Hop Router will be the Router that is originating the update.
4) Point to Multi Point
--> Used when all the network traffic from spoke ( Branch router) should go via hub ( Head Quarter).
--> Does not have DR/ BDR Election.
--> Next Hop Router will be the Router from which we are receiving the update.
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