Introduction to TCP

📘 Section 1: Basic Questions

Test your fundamental understanding of TCP concepts

1 Basic

What does TCP stand for in computer networking?

A Transmission Control Process

B Transport Communication Protocol

C Transmission Control Protocol

D Transfer Control Protocol

2 Basic

At which layer of the OSI model does TCP operate?

A Network Layer (Layer 3)

B Transport Layer (Layer 4)

C Session Layer (Layer 5)

D Data Link Layer (Layer 2)

3 Basic

What is the default port number for HTTP over TCP?

A 21

B 25

C 110

D 80

4 Basic

Which of the following is NOT a characteristic of TCP?

A Connectionless communication

B Reliable data delivery

C Flow control

D Error detection

📝 Section 2: Descriptive Questions

Demonstrate your knowledge of TCP mechanisms and features

5 Descriptive

What is the purpose of the TCP three-way handshake?

A To encrypt data transmission between hosts

B To compress data before transmission

C To establish a reliable connection and synchronize sequence numbers

D To route packets through the network

6 Descriptive

In TCP, what does the sliding window mechanism primarily control?

A The routing path of packets

B The amount of data that can be sent before receiving an acknowledgment

C The encryption strength of the connection

D The physical layer signal modulation

7 Descriptive

What happens when a TCP sender detects a timeout before receiving an ACK?

A It immediately closes the connection

B It sends a connection reset packet

C It increases the window size exponentially

D It retransmits the unacknowledged segment and reduces the congestion window

8 Descriptive

Which TCP flag is used to gracefully terminate a connection?

A FIN (Finish)

B RST (Reset)

C URG (Urgent)

D PSH (Push)

🔍 Section 3: Analytical Questions

Apply your understanding to solve complex TCP scenarios

9 Analytical

A TCP connection has a congestion window (cwnd) of 8 MSS and receives 4 duplicate ACKs. According to TCP Reno, what happens to cwnd and ssthresh?

A cwnd becomes 1 MSS, ssthresh becomes 4 MSS

B ssthresh becomes 4 MSS, cwnd becomes 4 MSS + 3 MSS

C cwnd becomes 16 MSS, ssthresh remains 8 MSS

D cwnd becomes 0, connection is terminated

10 Analytical

In a TCP connection, the RTT samples are: 100ms, 120ms, 110ms. Using Jacobson's algorithm with α = 0.875, what is the estimated RTT after the third sample? (Initial EstimatedRTT = 100ms)

A 107.5 ms

B 110.0 ms

C 113.4 ms

D 120.0 ms

11 Analytical

Two hosts are communicating via TCP. Host A sends segments with sequence numbers 1000, 1500, and 2000 (each 500 bytes). If the segment with seq=1500 is lost but 1000 and 2000 arrive, what ACK number will Host B send?

A 2500 (requesting the next expected segment)

B 2000 (acknowledging out-of-order receipt)

C 1000 (requesting retransmission from beginning)

D 1500 (indicating the next expected byte)

12 Analytical

A TCP sender using slow start has cwnd = 1 MSS and ssthresh = 16 MSS. After 4 successful RTTs with all ACKs received, what is the value of cwnd?

A 16 MSS

B 8 MSS

C 4 MSS

D 32 MSS

🌐 Introduction to TCP

📘 Section 1: Basic Questions

📝 Section 2: Descriptive Questions

🔍 Section 3: Analytical Questions

Quiz Completed!