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?

The correct answer is B: Layer 1 - Physical. 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.

During a network troubleshooting session, a technician finds that DNS resolution fails while DHCP assignment succeeds. Which layers are functioning and which is failing?

The correct answer is C: Layers 1-4 working; Layer 7 failing. DHCP (Layer 4) works, so Layers 1-4 are functional. DNS resolution failure indicates an issue at the Application Layer (Layer 7) or network configuration.

A network service requires authentication, encryption, and session management. These functions span across which OSI layers?

The correct answer is B: Layers 5, 6, and 7. Authentication and encryption are Presentation Layer (6) functions, while session management is a Session Layer (5) function. Application Layer (7) coordinates these.

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

The correct answer is A: Physical Layer (Layer 1). 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.

In a network troubleshooting scenario, ping command works but HTTP requests fail. Which OSI layer likely has the issue?

The correct answer is D: Application Layer or above. Since ping (Layer 3) works, Layers 1-3 are functional. HTTP failure indicates an issue at Layer 7 (Application) or Layer 6 (Presentation).

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Networking
OSI Model

OSI, TCP/IP, protocols, routing, security

26 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 26

Topics in Networking

All OSI Model 100

Q.11 Easy OSI Model

Which layer of the OSI model is responsible for routing and logical addressing?

A Network Layer (Layer 3)

B Data Link Layer (Layer 2)

C Transport Layer (Layer 4)

D Application Layer (Layer 7)

Correct Answer: A. Network Layer (Layer 3)

EXPLANATION

The Network Layer (Layer 3) handles routing decisions and logical addressing using IP addresses. It determines the best path for data packets to travel across networks.

Test

Q.12 Easy OSI Model

In the context of the OSI model, which layer is responsible for establishing, maintaining, and terminating connections?

A Transport Layer

B Session Layer

C Presentation Layer

D Network Layer

Correct Answer: B. Session Layer

EXPLANATION

The Session Layer (Layer 5) manages dialog control, session establishment, maintenance, and termination between applications.

Test

Q.13 Easy OSI Model

What is the primary function of the Presentation Layer (Layer 6) in the OSI model?

A Establishing and managing sessions

B Data encryption, compression, and translation

C Physical transmission of bits

D IP address resolution

Correct Answer: B. Data encryption, compression, and translation

EXPLANATION

Layer 6 handles data formatting, encryption, compression, and conversion between different character sets and formats for application compatibility.

Test

Q.14 Easy OSI Model

Which of the following protocols operates at the Transport Layer (Layer 4) of the OSI model?

A HTTP

B TCP/UDP

C ARP

D OSPF

Correct Answer: B. TCP/UDP

EXPLANATION

TCP and UDP are Transport Layer protocols that manage end-to-end communication, reliability, and port-based services.

Test

Q.15 Easy OSI Model

At which OSI layer do switches operate to forward frames based on MAC addresses?

A Physical Layer

B Data Link Layer

C Network Layer

D Session Layer

Correct Answer: B. Data Link Layer

EXPLANATION

Switches operate at Layer 2 (Data Link Layer) and use MAC address tables to forward frames to appropriate ports within a LAN.

Test

Q.16 Easy OSI Model

Which layer of the OSI model is responsible for routing packets across different networks?

A Network Layer (Layer 3)

B Data Link Layer (Layer 2)

C Transport Layer (Layer 4)

D Application Layer (Layer 7)

Correct Answer: A. Network Layer (Layer 3)

EXPLANATION

The Network Layer (Layer 3) handles routing, IP addressing, and logical addressing to forward packets across different networks using routers.

Test

Q.17 Easy OSI Model

Which of the following best describes encapsulation in the OSI model?

A The process of removing headers from data as it moves up the OSI layers

B The process of adding headers and trailers to data as it moves down the OSI layers

C The process of converting analog signals to digital signals

D The process of establishing a secure connection between two hosts

Correct Answer: B. The process of adding headers and trailers to data as it moves down the OSI layers

EXPLANATION

Encapsulation is the process of adding protocol-specific headers and trailers to data at each layer as it moves down from the Application Layer to the Physical Layer.

Test

Q.18 Easy OSI Model

In the context of the OSI model, routers primarily operate at which layer?

A Data Link Layer

B Transport Layer

C Network Layer

D Application Layer

Correct Answer: C. Network Layer

EXPLANATION

Routers operate at Layer 3 (Network Layer) and use IP addresses to forward packets between different networks.

Test

Q.19 Easy OSI Model

Which protocol operates at Layer 4 of the OSI model and ensures reliable, ordered delivery of data?

A UDP

B TCP

C IP

D ICMP

Correct Answer: B. TCP

EXPLANATION

TCP (Transmission Control Protocol) operates at Layer 4 and provides reliable, connection-oriented delivery with error checking and sequencing.

Test

Q.20 Easy OSI Model

At which OSI layer does a switch operate to forward frames based on MAC addresses?

A Layer 1 - Physical Layer

B Layer 2 - Data Link Layer

C Layer 3 - Network Layer

D Layer 4 - Transport Layer

Correct Answer: B. Layer 2 - Data Link Layer

EXPLANATION

Switches operate at Layer 2 (Data Link Layer) and use MAC address tables to forward frames to appropriate ports.

Test

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