SubnetNumber SubnetMask NextHop 128.96.39.0 128.96.39.128 128.96.40.0 192.4.153.

Question

SubnetNumber

SubnetMask

NextHop

128.96.39.0
  128.96.39.128
  128.96.40.0
  192.4.153.0
  <default>

255.255.255.128
  255.255.255.128
  255.255.255.128
  255.255.255.192

Interface 0
  Interface 1
  R2
  R3
  R4

Suppose a router has built up the routing table shown in the above table. The router can deliver the packets directly over interfaces 0 and 1, or it can forward packets to routers R2, R3, or R4. Describe what the router does with a packet addressed to each of the following destinations:
(a) 128.96.39.10
(b) 128.96.40.12
(c) 128.96.40.151
(d) 192.4.153.17
(e) 192.4.153.90

SubnetNumber

SubnetMask

NextHop

128.96.39.0
  128.96.39.128
  128.96.40.0
  192.4.153.0
  <default>

255.255.255.128
  255.255.255.128
  255.255.255.128
  255.255.255.192

Interface 0
  Interface 1
  R2
  R3
  R4

Explanation / Answer

a) 128.96.39.10 ---> Router will directly deliver the packet to Interface 0

b) 128.96.40.12 ---> Router will send the packets to R2 (Router 2)

c) 128.96.40.151 ---> Router will send the packets to R2 (Router 2)

d) 192.4.153.17 ---> R3

e) 192.4.153.90 ---> R3

This is the concept of using the router forwarding tables

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