1.4 Flashcards
1
Q
What is the equation for total packet delay?
A
dnodal = dproc + dqueue + dtrans + dprop
2
Q
What is transmission delay and how is it calculated?
A
L/R where
L is packet length
R is link bandwidth
3
Q
What is propagation delay and how is it calculated?
A
d: length of physical link
s: propagation speed (~2x10^8)
d/s
4
Q
What is Queueing delay?
A
Time waiting at outputted link for transmission
depends on congestion of router
5
Q
What is nodal processing delay?
this is dproc NOT dnodal which is the total delay at the node
A
Checking bit errors
determining output link
usually takes less than a ms
6
Q
What is throughput?
A
Rate at which bits are transferred between sender/receiver
has instantaneous and average rate
bottleneck link: link on end to end path that constrains end to end throughput
