August
1999 QUESTION 3 Total Marks: 20 Marks |
Click here to access other
questions
Click to access |
| (a) | Briefly describe, using diagrams, two
different network topologies. In each case, five an example application of networking in
which you might expect to find this topology and an advantage of this topology over the
others.
|
[8] |
| (b) | For the networks you have described, would the
transmission usually be serial, or would it be parallel? Explain your answer.
|
[3] |
| (c) | Of all the network topologies you have
studied, most would use (half or full) duplex connections. However, one of them, in its
simplest form, needs only simplex transmission. Which one is that, and why?
|
[3] |
| (d) | A string of twenty characters is to be
transmitted over a serial data transmission line. Calculate how many bits will be
transmitted in each of the following modes, and use this information to compute the
transmission efficiency in each case. (i) Synchronous data transmission, with 4 SYN characters and message begun with STX character and ended with EOT character. (ii) Asynchronous data transmission with 1 start bit and 2 stop bits. List any assumptions that you make.
|
[6] |