CIS 331: Network Introduction
Lehman College, City University of New York
Fall 2013
This Homework Is Due By 11:59 PM on November 17, 2013
Routers are connected to multiple networks. Usually, routers receive traffic from one adapter and
forward it through one of the other adapters it has. Suppose a router discovers it is about to
forward an IP datagram back over the same network interface on which the datagram arrived. Can
you think of a scenario where this would happen? Explain.
How can routers in a core system use default routes to send all illegal datagrams to a specific
machine?
Each router in the autonomous system shown below starts with a routing table showing the networks
they are directly connected to. The routers exchange routing information using a distance vector
protocol. Show the messages that are exchanged and the state of the routing tables after each message.
Use the Routing Tables sheet.
Please submit the completed assignment on Blackboard as a Microsoft Word file or a PDF file.
No other forms of submission will be accepted.
