Corporate & IT Interview Preparation

Q.11 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.

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Q.12 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.

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Q.13 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.

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Q.14 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.

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Q.15 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.

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Q.16 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.

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Q.17 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.

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Q.18 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.

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Q.19 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.

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Q.20 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.

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