TCP/IP model four layers in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to name the top layer of the TCP/IP model.

Computer Networks

The top layer of the TCP/IP model is the [1] layer.

Drag options to blanks, or click blank then click option'

ATransport

BApplication

CNetwork

DData Link

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the Application layer with the Transport or Network layers.

The Application layer is the top layer in the TCP/IP model. It handles user applications and network services.

2fill in blank

medium

Complete the code to name the layer responsible for end-to-end communication in the TCP/IP model.

Computer Networks

The [1] layer manages end-to-end communication and data flow control.

Drag options to blanks, or click blank then click option'

ANetwork

BPhysical

CTransport

DApplication

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the Transport layer with the Network layer.

The Transport layer ensures reliable data transfer between devices, managing flow control and error checking.

3fill in blank

hard

Fix the error in the code to correctly name the layer that routes data packets in the TCP/IP model.

Computer Networks

The [1] layer is responsible for routing data packets between networks.

Drag options to blanks, or click blank then click option'

AApplication

BData Link

CTransport

DNetwork

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Network layer with Data Link or Transport layers.

The Network layer routes data packets across different networks and handles logical addressing.

4fill in blank

hard

Fill both blanks to complete the description of the lowest layer in the TCP/IP model.

Computer Networks

The [1] layer handles the physical transmission of data, while the [2] layer manages logical addressing and routing.

Drag options to blanks, or click blank then click option'

ANetwork

BPhysical

CData Link

DTransport

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing Physical and Data Link layers or confusing Network with Transport.

The Physical layer deals with the actual hardware transmission of bits. The Network layer manages logical addressing and routing.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping TCP/IP layers to their main functions.

Computer Networks

tcp_ip_layers = {"[1]": "Handles user applications", "[2]": "Ensures reliable data transfer", "[3]": "Routes data packets"}

Drag options to blanks, or click blank then click option'

AApplication

BTransport

CNetwork

DData Link

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping Network and Transport layers or including Data Link incorrectly.

The Application layer handles user applications, Transport ensures reliable data transfer, and Network routes data packets.

Practice

1. Which of the following is NOT one of the four layers of the TCP/IP model?

easy

A. Transport Layer

B. Internet Layer

C. Application Layer

D. Session Layer

Solution

1. Step 1: Recall the four layers of the TCP/IP model

   The TCP/IP model consists of Application, Transport, Internet, and Network Interface layers.

2. Step 2: Identify the layer not in the TCP/IP model

   The Session Layer is part of the OSI model, not the TCP/IP model.

3. Final Answer:

   Session Layer -> Option D

4. Quick Check:

   TCP/IP layers exclude Session Layer [OK]

Hint: Remember TCP/IP has 4 layers, no Session Layer included [OK]

Common Mistakes:

• Confusing OSI model layers with TCP/IP layers
• Thinking Session Layer is part of TCP/IP
• Mixing Internet and Network Interface layers

2. Which layer of the TCP/IP model is responsible for providing end-to-end communication and error checking?

easy

A. Transport Layer

B. Network Interface Layer

C. Application Layer

D. Internet Layer

Solution

1. Step 1: Understand the role of the Transport Layer

   The Transport Layer manages end-to-end communication, including error detection and correction.

2. Step 2: Match the function to the correct layer

   Since error checking and reliable delivery are Transport Layer tasks, it is the correct answer.

3. Final Answer:

   Transport Layer -> Option A

4. Quick Check:

   End-to-end communication = Transport Layer [OK]

Hint: Transport Layer handles delivery and errors [OK]

Common Mistakes:

• Confusing Internet Layer with Transport Layer
• Thinking Application Layer handles error checking
• Mixing Network Interface Layer with Transport functions

3. Given the following data flow in the TCP/IP model: Application Layer -> Transport Layer -> Internet Layer -> Network Interface Layer, what is the correct order of processing when data is received from the network?

medium

A. Application -> Transport -> Internet -> Network Interface

B. Network Interface -> Internet -> Transport -> Application

C. Internet -> Network Interface -> Transport -> Application

D. Transport -> Application -> Internet -> Network Interface

Solution

1. Step 1: Understand the sending order of layers

   Data is sent from Application down to Network Interface layer.

2. Step 2: Reverse the order for receiving data

   When receiving, data flows from Network Interface up to Application layer.

3. Final Answer:

   Network Interface -> Internet -> Transport -> Application -> Option B

4. Quick Check:

   Receiving order reverses sending order [OK]

Hint: Receiving order is reverse of sending order [OK]

Common Mistakes:

• Confusing sending and receiving order
• Mixing layer names in wrong sequence
• Assuming Application layer receives data first

4. A student claims that the Internet Layer in the TCP/IP model is responsible for establishing a connection between two devices. What is wrong with this statement?

medium

A. Connection establishment is handled by the Transport Layer

B. Internet Layer only handles physical connections

C. Internet Layer manages user applications, not connections

D. Internet Layer encrypts data, not manages connections

Solution

1. Step 1: Identify the role of the Internet Layer

   The Internet Layer routes packets but does not establish connections.

2. Step 2: Identify which layer establishes connections

   The Transport Layer manages connection setup and teardown between devices.

3. Final Answer:

   Connection establishment is handled by the Transport Layer -> Option A

4. Quick Check:

   Connection setup = Transport Layer [OK]

Hint: Connection setup belongs to Transport Layer [OK]

Common Mistakes:

• Thinking Internet Layer establishes connections
• Confusing routing with connection setup
• Assuming Internet Layer manages applications

5. You want to design a simple messaging app that sends text messages over the internet. Which TCP/IP layer should you focus on to implement the user interface and message formatting?

hard

A. Network Interface Layer

B. Internet Layer

C. Application Layer

D. Transport Layer

Solution

1. Step 1: Understand the role of the Application Layer

   The Application Layer handles user interfaces and data formatting for applications.

2. Step 2: Match the app design needs to the correct layer

   Since the messaging app needs UI and message formatting, focus on the Application Layer.

3. Final Answer:

   Application Layer -> Option C

4. Quick Check:

   User interface and formatting = Application Layer [OK]

Hint: User apps run at Application Layer [OK]

Common Mistakes:

• Choosing Transport or Internet Layer for UI tasks
• Confusing Network Interface with application functions
• Thinking Transport Layer formats messages