computer homework

CMIS 435 – Summer 2015

HOMEWORK #4 – Week #4

This homework assignment is worth 10% of your course grade and contains five 20-point problems.

Read each problem carefully. Failure to follow the instructions for a problem will result in a zero score for that problem.

Submit the completed Homework via Assignment in LEO.

1. How did the Ethernet standard evolve to be able to support latency sensitive applications like streaming media?

1. What aspect of Ethernet can be a problem for security?  What mechanism(s) were added to fix the problem?

1. Compare and contrast CSMA/CD and CSMA/CA.

4.    Compare the efficiency of transmitting 1000 bytes of 7- bit ASCII data via:

a.       An asynchronous data link with each character requiring one start bit, two stop bits, and a parity bit, with

b.      An Ethernet II data link (less the preamble) as shown in figure 5-17 with each character having its own parity bit overhead,

where efficiency = data bits transmitted / total bits transmitted

5.a. _____  Which of the following correctly describes the Ethernet technology 10BASE5?

1.      10 Mbps baseband 50-ohm cable bus up to 500 meters in length

2.      100 Mbps baseband 50-ohm cable bus up to 750 meters in length

3.      10 Mbps baseband 60-ohm cable bus up to 250 meters in length

4.      10 Mbps baseband 50-ohm cable bus up to 1,000 meters in length

5.       none of the above

         b. ______ Which of the following correctly describes the Ethernet technology 10BASE-T?

                1.   100 Mbps baseband unshielded twisted-pair (UTP) star up to 150 meters in length

            2.   10 Mbps baseband unshielded twisted-pair (UTP) star up to 100 meters in length

3.   10 Mbps baseband shielded twisted-pair (STP) cable bus up to 100 meters in length

             4.   10 Mbps baseband shielded twisted-pair (STP) cable bus up to 200 meters in length

             5.   none of the above