8 TCP/IP Internetworking I Packet arrives with destination IP address 128.171.17

Question

8 TCP/IP Internetworking I Packet arrives with destination IP address 128.171.17.13 Decide how to send the packet back Select the best-match row ot Find all row matches Metric InterfaceNext- Cost) Mask (/Prefix) Row Destination Hop Router Network or Subnet 128.171.0.0 172.30.33.0 47 255.255.0.0 (16) 255.255.255.0 /24) 255.255.255.0 (/24) 255.0.0.0 (/8) 255.255.255.0 (/24) 255.255.255.0 (/24) 255.255.255.0 (/24) 255.255.255.0 (/24) 255.255.255.0 /24) 255.255.255.0 (/24) 255.255.255.0 (/24) 255.255.0.0 (16) 0.0.0.0 ( 3 60.168.6.0 12 123.0.0.0 172.29.8.0 172.40.6.0 128.171.17.0 172.29.8.0 172.12.6.0 172.30.12.0 34 47 20 23 10 2 172.30.12.0 3 12 13 GURE 8-11 60.168.0.0 16 2 0.0.0.0 Routing Table

Explanation / Answer

The address range of a network is decided by the mask value. The number of addresses in a mask is given as

232-mask. Hence for mask 24, the numbr of addresses is 28 = 256.

Now, for the destination network 172.30.12.124, the interface selected should be 3 since we can select the network 170.30.12.0 with cost 3 (least cost selected).

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