IP Datagram Forwarding . A router has the following (CIDR) entries in its routin

Question

IP Datagram Forwarding . A router has the following (CIDR) entries in its routing table: Address/mask Next hop 129.129.24.0/22 Interface 0 129.129.60.0/22 Interface 1 129.129.61.0/24 Interface 2 Default Interface 3

(a). From the routing information, construct the corresponding forwarding table. Destination address range Link interface 0 1 2 3

(b). For each of the following IP address, what does the router do if packets with the following addresses arrive?

i. 128.1.59.117

ii. 129.129.59.117

iii. 129.129.62.123

iv. 129.129.61.240

v. 129.129.60.1

Explanation / Answer

Hi

Routing table and Forwarding table are two different tables within an IP networking platform. They share common information but perform two distinctly different purposes. They also each have a different degree of resource capacity to perform their respective roles.

Routing Table:

Routing Information Base (RIB):The Routing Information Base RIB is where all IP Routing information is stored. it is not specific to any routing protocol, rather a repository where all the routing protocols place all of their routes. Routes are inserted into the RIB whenever a routing protocol running on the router learns a new route. When a destination becomes unreachable, the route is first marked unusable and later removed from the RIB as per the specifications of the routing protocol they were learned from.

Forwarding Table:

Forwarding Information Base (FIB):Forwarding Information Base (FIB) is used to make IP destination prefix-based switching decisions. FIB contains the interface identifier and next hop information for each reachable destination network prefix. The FIB is conceptually similar to a routing table. It maintains a mirror image of the forwarding information contained in the IP routing table.

Now Answer to question A).Forwarding table:

Answer to question B)

Note: See , since there is a network 129.129.60.0/22. Therefore the addresses starts from 129.129.60.1 to 129.129.62.254.

Thanks

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