The TCP/IP four-layer model

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Quick Questions

Shade in the A or B circle for each question.

1. Which layer of the TCP/IP model does HTTP belong to?

A Application layer

B Network access layer

2. Which statement about TCP and UDP is correct?

A They both work at the transport layer

B They both work at the internet layer

3. Which layer uses IP addresses to send packets between networks?

A Transport layer

B Internet layer

4. Ethernet and Wi-Fi belong to which layer?

A Application layer

B Network access layer

5. How many layers does the TCP/IP model have?

A Four

B Seven

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Application layer: HTTP		AHTTP is not a network access protocol. HTTP belongs to the application layer. The network access layer uses Ethernet and Wi-Fi.
2Transport layer: TCP, UDP		BInternet layer: IP
3The internet layer addresses packets and finds a route for them across networks.		CIP is not a transport layer protocol. IP belongs to the internet layer. The transport layer uses TCP and UDP.
4The network access layer sends data over the physical link, such as a cable or radio signal, to the next device.		DThe layer that manages delivery between devices: TCP is reliable and checks data arrives, UDP is faster but does not check.
5Transport layer: IP		EThe top layer, where programs such as web browsers use protocols like HTTP to request and send data.
6Network access layer: HTTP		FNetwork access layer: Ethernet, Wi-Fi

Definitions

TCP/IP model

Fill in the Blanks

Complete each line of code by filling in the missing parts.

Application layer protocol: ____

Transport layer: TCP and ___

Internet layer protocol: __

Network access layer: Ethernet and _____

Layer 1: application (HTTP) Layer 2: _________ (TCP, UDP) Layer 3: internet (IP)

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A application: HTTP

B transport: IP

C internet: IP

D network access: Wi-Fi

Question 2

A browser requests a page

B application layer: Ethernet

C transport layer: TCP

D internet layer: IP

Question 3

A layers = 4

B top = network access

C next = transport

D then = internet

E bottom = network access

Question 4

A HTTP -> application

B TCP -> transport

C IP -> internet

D Ethernet -> internet

E Wi-Fi -> network access

Question 5

A application: apps use HTTP

B transport: splits data, TCP

C internet: sends HTTP pages

D access: sends bits on a link

Answer Key

The TCP/IP four-layer model

Section A: Quick Questions

A — Application layer

A — They both work at the transport layer

B — Internet layer

B — Network access layer

A — Four

Section B: Match the Pairs

Application layer: HTTP → The top layer, where programs such as web browsers use protocols like HTTP to request and send data.

Transport layer: TCP, UDP → The layer that manages delivery between devices: TCP is reliable and checks data arrives, UDP is faster but does not check.

The internet layer addresses packets and finds a route for them across networks. → Internet layer: IP

The network access layer sends data over the physical link, such as a cable or radio signal, to the next device. → Network access layer: Ethernet, Wi-Fi

Transport layer: IP → IP is not a transport layer protocol. IP belongs to the internet layer. The transport layer uses TCP and UDP.

Network access layer: HTTP → HTTP is not a network access protocol. HTTP belongs to the application layer. The network access layer uses Ethernet and Wi-Fi.

Section C: Definitions

TCP/IP model — A four-layer plan for network communication: application (HTTP), transport (TCP, UDP), internet (IP) and network access (Ethernet, Wi-Fi). Each layer has its own job.

Section D: Fill in the Blanks

Application layer protocol: HTTP

Transport layer: TCP and UDP

Internet layer protocol: IP

Network access layer: Ethernet and Wi-Fi

Layer 1: application (HTTP)
Layer 2: transport (TCP, UDP)
Layer 3: internet (IP)

Section E: Spot the Error

B — IP works at the internet layer. The transport layer uses TCP or UDP, so line 2 should be 'transport: TCP'.

B — Ethernet belongs to the network access layer. A web browser's request uses HTTP at the application layer, so line 2 should be 'application layer: HTTP'.

B — The application layer is at the top of the TCP/IP model. Network access is at the bottom, so line 2 should be 'top = application'.

D — Ethernet is a network access layer technology. It moves data across a local link. Line 4 should be 'Ethernet -> network access'.

C — The internet layer uses IP to address packets and send them between networks. HTTP pages belong to the application layer. Line 3 should be 'internet: addresses with IP'.