Question $1$: Transport Layer $[10$ marks$]$

a$.$ Mark the following statements as True $($T$)$ or False $($F$)(5$ marks$)$

$\backslash$table$[[\backslash$table$[[$The transport layer is responsible for adding source and destination port$],[$numbers to the transport layer header.$]],],[\backslash$table$[[$numbers to the transport layer header.$],[$The transport layer is responsible for routing packets across the network$]],],[\backslash$table$[[$The transport layer is responsible for$],[$The transport layer is responsible for segmenting and reassembling data$],[$packets$.]],],[\backslash$table$[[$packets$.],[$The primary function of TCP is the forwarding of IP packets$]],],[\backslash$table$[[$The primary function of CPompared to UDP$],[$TCP is a faster protocol contogrity$]],],[\backslash$table$[[$TCP is a faster protocol comparea to$],[$TCP provides error detection mechanisms to ensure data integrity.$]],],[,],[\backslash$table$[[$UDP provides error detection mechanisms$]],],[$UDP has lower overhead compared to TCP$,],[$UDP is suitable for real$-$time streaming applications,$]]$

b$.$ Consider Figure $1$ below in which a TCP sender and receiver communicate over a connection in which the segment may be lost. The TCP sender sends initial window of five segments at $t=1,2,3,4,5,$ respectively. Suppose that the first segment has a sequence number $99$ and all segments each contain $512$ bytes. As shown in the figure, one of the five segments is lost between the sender and the receiver. Analyse the figure and give the sequence number field value in the sender$-$to$-$receiver segments in the first set of segments that are sent beginning at $t=1,$ and the acknowledgement number field value in the receiver$-$to$-$sender ACK segments that are sent from the receiver back to the sender beginning at $t=8(5$ marks$).$

$\backslash$table$[[\backslash$table$[[$Sender$],[$Receiver$]],\backslash$table$[[$Time$],[$sent$]],$segment,$\backslash$table$[[$Segment$],[$number$]]],[$Segment $1,1,,],[$Segment $2,2,,],[$Segment $3,3,,],[$Segment $4,4,,],[$Segment $5,5,,]]$

$\backslash$table$[[\backslash$table$[[$Receiver to$],[$Sender$]],\backslash$table$[[$Time$],[$sent$]],],[$Ack $1,,]]$

$2$