A company wants to convert data formats between different systems. Which OSI layer should handle this?

The correct answer is C: Presentation Layer. The Presentation Layer (Layer 6) handles data translation, encryption, compression, and format conversion (e.g., ASCII to EBCDIC).

A packet arrives at a router with a damaged frame header. At which OSI layer should this be detected?

The correct answer is B: Data Link Layer. The Data Link Layer (Layer 2) uses CRC (Cyclic Redundancy Check) to detect frame errors and corruption in the frame header.

Which protocol operates at the Data Link Layer and is primarily used in Ethernet networks?

The correct answer is C: MAC (Media Access Control) / 802.3. MAC and 802.3 standards operate at the Data Link Layer (Layer 2). They define how devices access and share Ethernet transmission media using MAC addresses.

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Networking

OSI, TCP/IP, protocols, routing, security

26 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–10 of 26

Topics in Networking

All OSI Model 100

Q.1 Easy OSI Model

In the OSI model, which layer is responsible for converting digital data into electrical signals for transmission over physical media?

A Physical Layer (Layer 1)

B Data Link Layer (Layer 2)

C Network Layer (Layer 3)

D Transport Layer (Layer 4)

Correct Answer: A. Physical Layer (Layer 1)

EXPLANATION

The Physical Layer (Layer 1) handles the conversion of data into physical signals (electrical, optical, or radio waves) and manages the hardware transmission of bits over the network medium.

Test

Q.2 Easy OSI Model

A network packet is traveling through the internet. At which OSI layer would the packet's source and destination IP addresses be read?

A Data Link Layer

B Transport Layer

C Network Layer

D Physical Layer

Correct Answer: C. Network Layer

EXPLANATION

The Network Layer (Layer 3) uses IP addresses to route packets across different networks.

Test

Q.3 Easy OSI Model

Which of the following devices operates at Layer 2 of the OSI model?

A Router

B Switch

C Hub

D Modem

Correct Answer: B. Switch

EXPLANATION

A switch operates at the Data Link Layer (Layer 2) using MAC addresses to forward frames within the same network segment.

Test

Q.4 Easy OSI Model

What is the primary function of the Session Layer in the OSI model?

A Managing dialogues between applications

B Routing packets across networks

C Encrypting data for security

D Converting data formats

Correct Answer: A. Managing dialogues between applications

EXPLANATION

The Session Layer (Layer 5) establishes, maintains, and terminates connections between applications, managing the conversation flow.

Test

Q.5 Easy OSI Model

Which OSI layer is responsible for converting data into signals suitable for transmission over physical media?

A Physical Layer

B Data Link Layer

C Network Layer

D Transport Layer

Correct Answer: A. Physical Layer

EXPLANATION

The Physical Layer (Layer 1) deals with the transmission of raw bits over physical media like copper wires, fiber optics, or radio waves.

Test

Q.6 Easy OSI Model

During a network analysis, packets are captured showing source and destination IP addresses. At which OSI layer were these addresses added to the data?

A Layer 2 - Data Link Layer

B Layer 3 - Network Layer

C Layer 4 - Transport Layer

D Layer 6 - Presentation Layer

Correct Answer: B. Layer 3 - Network Layer

EXPLANATION

IP addresses (source and destination) are added at the Network Layer (Layer 3). This happens when the Network Layer encapsulates transport layer segments into IP packets.

Test

Q.7 Easy OSI Model

An ISP technician troubleshoots a cable issue affecting network connectivity. The problem is at the layer that deals with physical transmission media. Which layer does this represent?

A Layer 2 - Data Link

B Layer 1 - Physical

C Layer 3 - Network

D Layer 4 - Transport

Correct Answer: B. Layer 1 - Physical

EXPLANATION

The Physical Layer (Layer 1) is responsible for the actual physical transmission media including cables, connectors, voltage levels, and signal transmission. Cable issues are Layer 1 problems.

Test

Q.8 Easy OSI Model

Which layer of the OSI model encapsulates data into segments?

A Physical Layer

B Data Link Layer

C Transport Layer

D Network Layer

Correct Answer: C. Transport Layer

EXPLANATION

The Transport Layer (Layer 4) encapsulates data from the Application Layer into segments (TCP) or datagrams (UDP) with port numbers and reliability information.

Test

Q.9 Easy OSI Model

In the OSI model, which layer is responsible for managing dialog control and session establishment?

A Transport Layer

B Presentation Layer

C Session Layer

D Application Layer

Correct Answer: C. Session Layer

EXPLANATION

The Session Layer (Layer 5) manages session establishment, maintenance, and termination. It handles dialog control between communicating devices.

Test

Q.10 Easy OSI Model

Which OSI layer protocols include TCP and UDP?

A Layer 2 - Data Link Layer

B Layer 3 - Network Layer

C Layer 4 - Transport Layer

D Layer 5 - Session Layer

Correct Answer: C. Layer 4 - Transport Layer

EXPLANATION

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) operate at Layer 4, the Transport Layer. TCP is connection-oriented while UDP is connectionless.

Test

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