a$.$ Which header fields are used by TCP during demultiplexing at the receiver.

b$.$ Suppose Host A sends two TCP segments back$-$to$-$back to Host B over a TCP

connection. The first segment has sequence number $80$; the second has

sequence number $150.$ How much data in terms of bytes is in the first segment?

Suppose that the first segment is lost but the second segment arrives at B$.$ In the

segment that Host B sends to Host A$,$ what will be the acknowledgment number?

c$.$ Suppose that TCP$\text{'}$s current estimated values for the round$-$trip time

$($estimatedRTT$)$ and deviation in the RTT $($DevRTT$)$ are $220$ msec and $12$ msec,

respectively. Suppose that the next two measured values of the RTT are $230$

msec and $200$ msec. Compute the values of the TCP TimeoutInterval after each

of these two measured RTT values are obtained. Use the values of $\backslash$alpha $=0\mathrm{.}125,$

and $\backslash$beta $=0\mathrm{.}25.$ Assume that, for each sample, estimatedRTT is computed first

followed by DevRTT computation.

d$.$ In congestion avoidance phase of TCP RENO and Tahoe, what happens to cwnd

if $3$ duplicate ACKs are received? a$.$ Which header fields are used by TCP during demultiplexing at the receiver.

b$.$ Suppose Host A sends two TCP segments back$-$to$-$back to Host B over a TCP

connection. The first segment has sequence number $80$ ; the second has

sequence number $150.$ How much data in terms of bytes is in the first segment?

Suppose that the first segment is lost but the second segment arrives at $B.$ In the

segment that Host $B$ sends to Host $A,$ what will be the acknowledgment number?

c$.$ Suppose that TCP$\text{'}$s current estimated values for the round$-$trip time

$($estimatedRTT$)$ and deviation in the RTT $($DevRTT$)$ are $220$msec and $12$msec,

respectively. Suppose that the next two measured values of the RTT are $230$

msec and $200$msec. Compute the values of the TCP Timeoutlnterval after each

of these two measured RTT values are obtained. Use the values of $=0\mathrm{.}125,$

and $=0\mathrm{.}25.$ Assume that, for each sample, estimatedRTT is computed first

followed by DevRTT computation.

d$.$ In congestion avoidance phase of TCP RENO and Tahoe, what happens to cwnd

if $3$ duplicate ACKs are received?