Chapter 7
P.1
a. For N= 4,L= 3200, B = 9600, P = 1024, H = 16, S = 0.2, D = 0.001, compute the end - to - end delay for circuit switching. Assume that there is no node delay.
|
Circuit switching |
||
|
setup |
call setup time |
|
|
first bit arrive |
Number of hops x prop Delay |
|
|
additional time to last bit arrive |
length of message /data rate on lengths |
|
|
acknoligment |
Number of hops x prop Delay + overhead Bits per packet/ data rate on links |
|
|
N= 4,L= 3200, B = 9600, P = 1024, H = 16, S = 0.2, D = 0.001 |
||
|
setup |
0.2 |
|
|
first time arival |
0.004 |
|
|
additional time to last bit arrive |
0.33333 |
|
|
acknowledgment |
0.00567 |
|
|
TOTAL |
0.543 |
|
�
P.2
a. Station > node>central>node>station
In a star network of N nodes the average number of hops would be 2.
c. Station > node>node>station
In a fully connected network of N nodes the average number of hops would be 1.
P.3
Layer 2 regulates the flow between DTE and DCE
Layer 3 regulates the flow over a signal virtual circuit
P.4
The virtual; circuit number has only local significance not global.