The Ad Hoc network shown below (including node Q) is currently operat.pdf

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The Ad Hoc network shown below (including node Q) is currently operating. The network is running the AODV routing protocol. Show the steps required to route a packet from node P to node G. In particular, show what state is maintained at relevant nodes in the network. What changes occur to the route, and how are these determined if node 0 drops out of the network? Solution Part 1 Aodv is one of the on demand routing. Aodv routing first search for route in routing table.If no route found then do route discovery. Initially, no routing table. So, P send RREQ(route request message) throught flooding. RREQ msg contain Source id, Sequence number, destination id, sequence of route Step 1. P send RREQ to N, L,Q Step 2. N send RREQ to O,K,L,J,P L send RREQ to N,J,P Q send RREQ to I,P Step 3. O send RREQ to M,K,N K send RREQ to M,O,N,J L send RREQ to N,J,P J send RREQ to E,K,N,L P ignore this request because its send through P only (send by N) N send RREQ to O,K,L,J,P J send RREQ to E,K,N,L P ignore this request because its send through P only (send by L) I send RREQ to Q,F,H,G P ignore this request because its send through P only (send by Q) Step 4. M send RREQ to O,K (P->N->o->M) K send RREQ to M,O,N,J (P->N->O->K) N ignore this message because msg go through it. Like this it will flood in whole network. Once the RREQ reaches to G that is destination id in RREQ. G will send unicast msg RREP(route replay msg ) to source node that is P G->I->Q->P (RREP) When P receive RREP then P send data msg throught the route (P->Q->I->G) P save this route in routing table for future reference. Part 2 When P want to send data to G. Ist check route for node G in routing table. It will find route in route table that will go through Q node. P send data msg to Q and wait for ACK. No ack come. Then send RREQ msg again. Step 1 P send RREQ to N,L (P->N),(P->L) Like this it will flood in whole network Once it reach to G This will be shortest path Path (P->N->J->E->D->F->G) Path (P->L->J->E->D->F->G) Among this two path G will take one path that reaches G firstly for RREP. When P receive RREP then P send data msg throught the route. P save this route in routing table for future reference..

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G->I->Q->P (RREP)
When P receive RREP then P send data msg throught the route (P->Q->I->G)
P save this route in routing table for future reference.
Part 2
When P want to send data to G.
Ist check route for node G in routing table. It will find route in route table that will go through Q
node.
P send data msg to Q and wait for ACK. No ack come. Then send RREQ msg again.
Step 1
P send RREQ to N,L (P->N),(P->L)
Like this it will flood in whole network
Once it reach to G
This will be shortest path
Path (P->N->J->E->D->F->G)
Path (P->L->J->E->D->F->G)
Among this two path G will take one path that reaches G firstly for RREP.
When P receive RREP then P send data msg throught the route.
P save this route in routing table for future reference.

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