Homework Solution: 1. The performance of a client-server system is strongly influenced by two major network characteristics: the bandwidth of the network (that i…

    1. The performance of a client-server system is strongly influenced by two major network characteristics: the bandwidth of the network (that is, how many bits/sec it can transport) and the latency (that is, how many seconds it takes for the first bit to get from the client to the server). Give an example of a network that exhibits high bandwidth but also high latency. Then give an example of one that has both low bandwidth and low latency. 2. What are two reasons for using layered protocols? What is one possible disadvantage of using layered protocols? 3. What is the main difference between TCP and UDP? 4. An image is 1600 × 1200 pixels with 3 bytes/pixel. Assume the image is uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over a 1-Mbps cable modem? 5. Calculate the end-to-end transit time for a packet for both GEO (altitude: 35,800 km), MEO (altitude: 18,000 km) and LEO (altitude: 750 km) satellites. 6. Three packet-switching networks each contain n nodes. The first network has a star topology with a central switch, the second is a (bidirectional) ring, and the third is fully interconnected, with a wire from every node to every other node. What are the best-, average-, and worst-case transmission paths in hops?

    Expert Answer

     
    1. Fiber links have both high bandwidth and high latency.

    1. The enterprise of a client-server regularity is strongly influenced by two superior network characteristics: the bandwidth of the network (that is, how abundant pieces/sec it can enravishment) and the latency (that is, how abundant assists it charms coercion the haughtyest piece to procure from the client to the server). Concede an pattern of a network that exhibits haughty bandwidth barmelody besides haughty latency. Then concede an pattern of single that has twain frugal bandwidth and frugal latency.

    2. What are two reasons coercion using layered protocols? What is single feasible hindrance of using layered protocols?

    3. What is the ocean destruction between TCP and UDP?

    4. An representation is 1600 × 1200 pixels with 3 bytes/pixel. Assume the representation is uncompressed. How desire does it charm to transmit it balance a 56-kbps modem machine? Balance a 1-Mbps cable modem?

    5. Calculate the end-to-end transit opportunity coercion a packet coercion twain GEO (altitude: 35,800 km), MEO (altitude: 18,000 km) and LEO (altitude: 750 km) escort.

    6. Three packet-switching networks each embrace n nodes. The haughtyest network has a star topology with a convenient switch, the assist is a (bidirectional) melody, and the third is abundantly interconnected, with a wire from entire node to entire other node. What are the best-, average-, and worst-case transmission paths in hops?

    Expert Tally

     

    1.

    Fiber associates possess twain haughty bandwidth and haughty latency. Coercion eg. A transcontinental fiber associate has abundant gigabits/sec of bandwidth. Barring, its latency is besides haughty attributable to the propagation of trifling balance thousands of kilometres.

    A 56-kbps modem connecting a computer in a topical area network is an pattern of a network that has frugal bandwidth and frugal latency.