Corporate & IT Interview Preparation

Q.1 Easy OSI Model

Which layer of the OSI model is responsible for routing packets across 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 move data across different networks using routers.

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Q.2 Easy OSI Model

What is the primary function of the Data Link Layer in the OSI model?

A Encryption and decryption of data

B Frame formatting and MAC addressing

C Session management

D DNS resolution

Correct Answer: B. Frame formatting and MAC addressing

Explanation:

The Data Link Layer (Layer 2) uses MAC addresses for physical addressing and creates frames for transmission over physical media.

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Q.3 Easy OSI Model

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

A IP and ICMP

B TCP and UDP

C HTTP and HTTPS

D ARP and DHCP

Correct Answer: B. TCP and UDP

Explanation:

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are core Transport Layer protocols that manage end-to-end communication.

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Q.4 Easy OSI Model

The Physical Layer of the OSI model deals with which of the following?

A Logical addressing and routing

B User authentication and data encryption

C Electrical signals, cables, and hardware devices

D Application-level protocols and services

Correct Answer: C. Electrical signals, cables, and hardware devices

Explanation:

Layer 1 (Physical Layer) handles the actual transmission of raw bits over physical media like cables, fiber optics, and wireless signals.

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Q.5 Easy OSI Model

Which layer of the OSI model is responsible for managing dialogs and session establishment?

A Presentation Layer (Layer 6)

B Session Layer (Layer 5)

C Transport Layer (Layer 4)

D Application Layer (Layer 7)

Correct Answer: B. Session Layer (Layer 5)

Explanation:

The Session Layer (Layer 5) manages, establishes, and terminates communication sessions between applications.

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Q.6 Easy OSI Model

Which of the following layers of the OSI model is responsible for converting data into signals suitable for transmission over a physical medium?

A Physical Layer

B Data Link Layer

C Network Layer

D Transport Layer

Correct Answer: A. Physical Layer

Explanation:

The Physical Layer (Layer 1) handles the conversion of data into electrical signals, light pulses, or radio waves for transmission over physical media.

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Q.7 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.

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Q.8 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.

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Q.9 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.

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Q.10 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.

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