Networking....?

1.A ten story office building has a 20 adjacent offices per floor, each offices contains a wall socket for a terminal in the front wall so that the sockets form a rectangular grid in the vertical plane with a separation of 5 m, between two sockets both horizontally and vertically, assuming that it is feasible to run a straight cable between any pair of sockets horizontally and vertically or diagonally how many meters of cable are needed to convert all sockets using:


a.star configuration w/ single router in the middle


b.An IEEE 802.3 LAN


c.A ring net without a wire connector








2.Write a program (any language) that simulates a computer network using discrete time. The first packet on each router queue makes one hop for time interval. Each router has only a finite number of buffers if a packet arrives and there’s no room for it , it is discarded and not retransmitted instead there’s an end to end protocol compute in time out and acknowledgement for the source router, plot the through put by the network as a function of the end to end time out interval parametize by an error rate.





3.at the low end the telephone system is star shape with all the local loops in the neighborhood converging on an end office in contrast cable television consists of a single low cable is snaking its way pass all the houses in the same neighborhood. Suppose that a future cable television system were 10GB per second fiber instead of copper, could it be used to simulate the telephone model of everybody having their own private line to the end office, if so how many one telephone houses could be hook up to a single fiber.





4.When transferring a file between 2 computers for acknowledgement strategies are possible.


In the first one the file is chop up into several packets w/c are individually acknowledge by the receiver but a file transfer as a whole is not acknowledge by the receiver.


In the second acknowledgement strategy the packets are not acknowledge individually but the entire file is acknowledge when it arrives. Discuss the 2 approaches.

Networking....?
Do your own homework.