3.1.8+Speed+of+Data+transmition+across+a+network

= Explain why the speed of data transmission across a network can vary. =

Packets are sent to a queue. The delay depends on the number of items in the queue.
 * == Nodal Processing: ==
 * Packet header examination
 * Error checking

Transmission delay:
L/R=Time to send bits into link R= link bandwidth (bps) L= packet length (bits)

Propagation delay:
Propagation Delay = d/s

d = length of physical link s = propagation speed in medium (~2x108 m/sec)

In a WAN the delay is in the order of milliseconds. || ||