Homework Assignment $1$

Max: $100$ points

Name:

Studen

Solve the following problems using Word processor and submit your answers into Dropbox by the midnight of the due date.

What are the layers in OSI Reference Model? $(20$ points$)$

List advantages and disadvantages of layer approach? $(20$ points$)$

What are the functionalities of transport layer in OSI model? Explain briefly each $(20$ points$)$

How long does it take to send a file of $512$ bytes from host $A$ to host $B$ over a circuit$-$switched network? $(20$ points$)$

$\frac{?}{{?}_{\frac{?}{?}}}$ All links are $15Mbps$

$\frac{?}{{?}_{\frac{?}{?}}}$ Each link uses TDM with $50$ slots$/$sec

$\frac{?}{{?}_{\frac{?}{?}}800ms}$ to establish end$-$to$-$end circuit

$10$ links are between host A and hast $B.$

How long does it take to send a file of $15$ Kbytes from host $A$ to host $B$ over a packet$-$switching network? Each link has a bit rate of points$).$ Consider only the transmission delay.

$1$