GATEverse — GATE CSE previous year questions

Consider the three-way handshake mechanism followed during $\text{TCP}$ connection establishment between hosts $P$ and $Q$ . Let $X$ and $Y$ be two random $32$ -bit starting sequence numbers chosen by $P$ and $Q$ respectively. Suppose $P$ sends a $\text{TCP}$ connection request message to $Q$ with a $\text{TCP}$ segment having $\text{SYN}$ bit $=1$ , $\text{SEQ}$ number $=X$ , and $\text{ACK}$ bit $=0$ . Suppose $Q$ accepts the connection request. Which one of the following choices represents the information present in the $\text{TCP}$ segment header that is sent by $Q$ to $P$ ?

(A)

$\text{SYN}$ bit $=1$ , $\text{SEQ}$ number $=X+1$ , $\text{ACK}$ bit $=0$ , $\text{ACK}$ number $=Y$ , $\text{FIN}$ bit $=0$

(B)

$\text{SYN}$ bit $=0$ , $\text{SEQ}$ number $=X+1$ , $\text{ACK}$ bit $=0$ , $\text{ACK}$ number $=Y$ , $\text{FIN}$ bit $=1$

(C)

$\text{SYN}$ bit $=1$ , $\text{SEQ}$ number $=Y$ , $\text{ACK}$ bit $=1$ , $\text{ACK}$ number $=X+1$ , $\text{FIN}$ bit $=0$

(D)

$\text{SYN}$ bit $=1$ , $\text{SEQ}$ number $=Y$ , $\text{ACK}$ bit $=1$ , $\text{ACK}$ number $=X$ , $\text{FIN}$ bit $=0$