22.4.3 Network Layer Quiz: Test Your Knowledge

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Questions and Answers

What is the main purpose of the application layer when communicating over a network?

To standardize the port addresses for popular services

To find the numeric network address of the destination computer (correct)

To handle the segmentation and reassembly of messages

To manage the routing of packets through the network

What information does the TCP software use when an application layer program generates an outgoing message?

The source application name and the destination application name

The source port address and the destination port address (correct)

The source MAC address and the destination MAC address

The source IP address and the destination IP address

What is the standard port address used for web servers on the Internet?

Port 80 (correct)

Port 25

Port 21

Port 23

What is the purpose of segmenting in the context of network communication?

To take one outgoing message from the application layer and break it into smaller segments for transmission Signup and view all the answers

What is one of the challenges at the transport layer when it comes to segmenting messages?

Deciding how big to make the segments Signup and view all the answers

Which of the following is not a standardized port address for a popular Internet service?

HTTP: Port 90 Signup and view all the answers

What is the primary reason for the development of IPv6?

To increase the number of available IP addresses Signup and view all the answers

Which layer of the Internet Protocol Suite is responsible for end-to-end delivery of messages?

Transport layer Signup and view all the answers

Which protocol is not a primary function of the transport layer?

Routing Signup and view all the answers

For which network was the Transmission Control Protocol/Internet Protocol (TCP/IP) originally developed?

ARPANET Signup and view all the answers

What is the typical size of the header in a TCP segment?

192 bits Signup and view all the answers

Which protocol is connectionless and does not provide reliability or flow control?

UDP Signup and view all the answers

What is the primary function of the Transmission Control Protocol (TCP)?

Linking the application layer to the network layer Signup and view all the answers

Which protocol is responsible for routing messages to their final destination in the TCP/IP suite?

IP (Internet Protocol) Signup and view all the answers

What is the size of a typical TCP header, excluding options?

20 bytes Signup and view all the answers

Which organization developed the TCP/IP protocol suite?

U.S. Department of Defense's Advanced Research Project Agency (ARPANET) Signup and view all the answers

Which statement about the Internet Protocol Suite is true?

The Internet Protocol Suite dominates and is used by most backbone networks and WANs Signup and view all the answers

What information does the destination port in the TCP header provide?

The application layer program to which the packet should be sent Signup and view all the answers

Study Notes

Finding Destination Computer's Address

The application layer needs to find the numeric network address of the destination computer.
Each application layer software package has a unique port address.

Port Addresses

Standardized port addresses are used for popular services:
- Web server: port 80
- FTP servers: port 21
- Telnet: port 23
- SMTP: port 25

Segmenting

Segmenting involves breaking down large application layer messages into smaller segments for transmission and reassembling them at the destination.
The transport layer decides how big to make the segments.

IPv4 and IPv6

IPv4 allows for approximately 4.2 billion addresses, but some are reserved.
IPv6 allows for 3.4 x 10^38 addresses, more than enough for the foreseeable future.

Transport Layer

The transport layer is responsible for end-to-end delivery of messages.
It links the application layer with the network layer.
Breaking long messages into smaller segments is a key function of the transport layer.

TCP/IP

TCP/IP was developed in 1974 for the U.S. Department of Defense's Advanced Research Project Agency network (ARPANET).
It is the transport/network layer protocol used on the Internet.
TCP/IP allows for reasonably efficient and error-free transmission.

TCP

A typical TCP segment has a 192-bit header (24 bytes) of control information.
The destination port tells the TCP software at the destination which application layer program the application layer packet should be sent to.

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Description

Test your knowledge about network layer protocols with this quiz. Questions cover topics like the Internet Protocol Suite, TCP, and the functions of transport and network layer protocols.

Network Layer Protocols Quiz