14.8.3 Module Quiz – Transport Layer (Answers)

Introduction

The Transport Layer is a crucial part of the OSI model and the TCP/IP suite, responsible for end-to-end communication, error recovery, flow control, and data segmentation. As part of the Cisco Certified Network Associate (CCNA) 200-301 certification, understanding the Transport Layer is essential for networking professionals.

This article provides detailed answers and explanations for the 14.8.3 Module Quiz – Transport Layer from the CCNA 200-301 curriculum. Additionally, we recommend Study4Pass as a reliable resource for exam preparation, offering high-quality study materials, practice tests, and expert guidance.

Transport Layer Overview

The Transport Layer (Layer 4) ensures reliable data transmission between devices. The two primary protocols at this layer are:

1. Transmission Control Protocol (TCP) – Connection-oriented, reliable, and ensures data delivery with acknowledgments.

2. User Datagram Protocol (UDP) – Connectionless, faster, but does not guarantee delivery.

Key Functions of the Transport Layer

• Segmentation & Reassembly – Breaks data into smaller segments for transmission.

• Error Control – Detects and retransmits lost packets (TCP only).

• Flow Control – Manages data transmission speed to avoid congestion.

• Multiplexing & Demultiplexing – Uses port numbers to direct traffic to the correct application.

14.8.3 Module Quiz – Transport Layer (Answers & Explanations)

Question 1:

Which protocol provides connection-oriented, reliable communication at the Transport Layer?

• A) UDP

• B) IP

• C) TCP

• D) ICMP

Question 2:

What is the purpose of port numbers in the Transport Layer?

• A) To identify devices on a network

• B) To determine the best path for data routing

• C) To multiplex and demultiplex data to the correct application

• D) To encrypt data for secure transmission

Question 3:

Which of the following is a characteristic of UDP?

• A) Flow control

• B) Acknowledgments

• C) Low overhead

• D) Connection establishment

Question 4:

What does the sequence number in a TCP header help accomplish?

• A) Identifying the destination port

• B) Ensuring packets are reassembled in order

• C) Encrypting the data

• D) Assigning IP addresses

Question 5:

Which Transport Layer protocol is used for real-time applications like VoIP?

• A) TCP

• B) UDP

• C) FTP

• D) HTTP

Question 6:

What is the three-way handshake in TCP?

• A) A method for encrypting data

• B) A process for establishing a connection (SYN, SYN-ACK, ACK)

• C) A way to assign IP addresses

• D) A technique for error detection

Question 7:

Which field in the TCP header helps with flow control?

• A) Sequence number

• B) Acknowledgment number

• C) Window size

• D) Checksum

Question 8:

Why does DNS typically use UDP instead of TCP?

• A) DNS requires high reliability

• B) DNS queries are small and fast

• C) DNS uses encryption

• D) DNS needs flow control

Question 9:

What happens if a TCP segment is lost during transmission?

• A) The sender retransmits the segment after a timeout

• B) The connection is terminated

• C) The receiver requests a new IP address

• D) UDP takes over the transmission

Question 10:

Which of the following is NOT a Transport Layer protocol?

• A) TCP

• B) UDP

• C) IP

• D) SCTP

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Conclusion

Mastering the Transport Layer is essential for the CCNA 200-301 exam. This guide provided answers and explanations for the 14.8.3 Module Quiz, helping you understand TCP, UDP, port numbers, flow control, and error handling.

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