Transport Layer in Computer Networks

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What is the primary purpose of the source port field in a TCP header?

To control the flow of data between devices
To identify the source application by port number (correct)
To indicate the sequence number of the segment
To identify the destination application

What is the purpose of the acknowledgment number field in a TCP header?

To identify the destination application
To indicate the next byte expected from the source (correct)
To indicate the sequence number of the segment
To control the flow of data between devices

What is the primary function of the header length field in a TCP header?

To identify the destination application
To indicate the sequence number of the segment
To control the flow of data between devices
To indicate the length of the TCP segment header (correct)

What is the purpose of the window size field in a TCP header?

To indicate the number of bytes that can be accepted at one time (A) Signup and view all the answers

What is the primary function of the checksum field in a TCP header?

To check for errors in the segment header and data (A) Signup and view all the answers

How many bytes are required for the UDP header?

8 bytes (B) Signup and view all the answers

What is the primary function of TCP?

To provide reliability and reordering of segments (D) Signup and view all the answers

What is a characteristic of UDP?

Data is reconstructed in the order that it is received (B) Signup and view all the answers

What is the primary purpose of the Source Port field in the UDP header?

To identify the source application (A) Signup and view all the answers

Which of the following applications would likely use UDP?

Live video streaming services (D) Signup and view all the answers

What is a key difference between TCP and UDP?

TCP is more reliable than UDP (C) Signup and view all the answers

What is the purpose of the Checksum field in the UDP header?

To detect errors in the datagram (B) Signup and view all the answers

Why are port numbers used in TCP and UDP transport layer protocols?

To manage multiple, simultaneous conversations (D) Signup and view all the answers

What type of communication is an example of an application that handles reliability itself?

Unidirectional communication (B) Signup and view all the answers

How many fields are present in the UDP header?

4 fields (C) Signup and view all the answers

Which of the following is an example of a simple request and reply application that uses UDP?

DNS (D) Signup and view all the answers

Which of the following protocols uses port 53?

DNS (C) Signup and view all the answers

What is the purpose of the netstat command?

To verify connections and identify potential security threats (C) Signup and view all the answers

Which of the following port numbers is registered by Cisco for its RADIUS server authentication process?

1812 (D) Signup and view all the answers

What is the primary purpose of well-known port numbers?

To provide a standard set of ports for common network services (D) Signup and view all the answers

What is the purpose of ephemeral ports?

To assign temporary ports to client applications (B) Signup and view all the answers

Which of the following protocols uses port 443?

HTTPS (A) Signup and view all the answers

What is the range of private and/or dynamic ports?

1024-49151 (D) Signup and view all the answers

Which of the following protocols uses port 22?

SSH (D) Signup and view all the answers

What is the primary function of flow control in TCP?

To regulate the amount of data that can be sent at one time (A) Signup and view all the answers

What is the relationship between the Ethernet maximum transmission unit (MTU) and the Maximum Segment Size (MSS)?

The MSS is determined by subtracting the IP and TCP headers from the MTU (C) Signup and view all the answers

What happens when congestion occurs on a network?

Packets are discarded by the overloaded router (D) Signup and view all the answers

What is a key feature of Selective ACK (SACK)?

It allows the receiver to explicitly acknowledge which segments were received (D) Signup and view all the answers

What is the advantage of UDP's low overhead?

It reduces the amount of datagram header information (C) Signup and view all the answers

What is the purpose of TCP's congestion handling mechanisms?

To reduce the rate of data transmission during congestion (C) Signup and view all the answers

What is the default Ethernet maximum transmission unit (MTU) in bytes?

1500 (B) Signup and view all the answers

What is the result of subtracting the IP and TCP headers from the Ethernet MTU?

1460 bytes (D) Signup and view all the answers

What is the primary role of the transport layer in data communication?

Establishing logical communications between applications (C) Signup and view all the answers

What is the term used to describe a set of data flowing between a source application and a destination application?

Conversation (C) Signup and view all the answers

What is the purpose of adding header information to data in the transport layer?

To perform different functions in managing data communication (A) Signup and view all the answers

How does the transport layer enable different communication conversations to be interleaved on the same network?

Through segmentation and multiplexing (A) Signup and view all the answers

What is the primary responsibility of IP in data communication?

Structuring, addressing, and routing packets (C) Signup and view all the answers

What is the main difference between the transport layer and IP?

The transport layer is responsible for managing conversations, while IP is concerned with packet routing (A) Signup and view all the answers

What is the role of transport layer protocols in data communication?

To specify how to transfer messages between hosts and manage reliability requirements (A) Signup and view all the answers

What is the relationship between the transport layer and the application layer?

The transport layer provides a link between the application layer and the lower layers (D) Signup and view all the answers