IP Router & IP Forwarding Table

In summary, an IP router is a device that forwards data packets between networks, using routing protocols and IP addresses. It works by analyzing destination IP addresses and consulting its forwarding table to determine the best path for the packet. The forwarding table is a database used by the router to make these routing decisions, and it is populated through manual configuration, dynamic routing protocols, or network discovery protocols. The forwarding table is crucial for the router's functioning as it enables efficient and accurate packet forwarding.
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Quincy
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Homework Statement



Consider an IP Router with four link interfaces numbered 0 to 3. Packets are to be forwarded according to the table:
http://img688.imageshack.us/img688/4844/iproutertable.jpg

Write down an IP forwarding table with ve entries that forwards packets to the correct interfaces. Use CIDR (Classless Interdomain Routing) notation for the network addresses.

The Attempt at a Solution



Interface 0: 11100000 00 -> 224.0.0.0/10

Interface 1: 11100000 01000000 -> 224.64.0.0/16


Interface 2: 11100001 0 -> 225.0.0.0/9 (Solution manual says it should be 1110000 -> 225.0.0.0/7 --- Why/How?)
 
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Anyone? really need help with this one...
 

Related to IP Router & IP Forwarding Table

1. What is an IP router?

An IP router is a networking device that is responsible for forwarding data packets between different networks. It uses routing protocols and IP addresses to determine the best path for data to travel from the source to the destination.

2. How does an IP router work?

An IP router works by receiving incoming data packets and analyzing their destination IP address. It then looks at its routing table to determine the best path for the packet to reach its destination. The router then forwards the packet to the next hop in the path until it reaches its final destination.

3. What is an IP forwarding table?

An IP forwarding table, also known as a routing table, is a database that contains information about the various networks and their corresponding IP addresses that an IP router is connected to. It is used by the router to determine the best path for data packets to reach their destination.

4. How is an IP forwarding table populated?

An IP forwarding table is populated through various means such as manual configuration by a network administrator, dynamic routing protocols, or network discovery protocols. These methods help the router to learn about the networks it is connected to and build its forwarding table accordingly.

5. What is the importance of an IP forwarding table?

The IP forwarding table is crucial for the functioning of an IP router. It allows the router to efficiently and accurately forward data packets to their intended destination. Without a forwarding table, the router would not know where to send the data, causing delays and disruptions in network communication.

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