Networking MCQ Questions

Q.71 Medium OSI Model

A manufacturing facility's IoT devices communicate using raw bit transmission over twisted pair cables. Which OSI layer(s) are being utilized?

A Layers 1 and 2

B Layer 1 only

C Layers 2 and 3

D Layers 3, 4, and 5

Correct Answer: A. Layers 1 and 2

EXPLANATION

Raw bit transmission over physical media (twisted pair cables) involves Layer 1 (Physical Layer). Data Link Layer (Layer 2) protocols handle the framing and transmission rules for these bits.

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Q.72 Medium OSI Model

In a corporate network, certain applications require guaranteed delivery and error checking, while others prioritize speed. Which Layer 4 protocols would best serve these requirements respectively?

A TCP for speed; UDP for guaranteed delivery

B UDP for both; TCP for neither

C TCP for guaranteed delivery; UDP for speed

D Both TCP and UDP provide identical services

Correct Answer: C. TCP for guaranteed delivery; UDP for speed

EXPLANATION

TCP provides reliable, ordered delivery with error checking; UDP prioritizes speed with minimal overhead. Choice of protocol depends on application requirements.

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Q.73 Medium OSI Model

A network administrator needs to implement a solution to prevent unauthorized access to sensitive data transmitted over the network. Which OSI layer would be most appropriate for implementing encryption?

A Layer 2 - Data Link Layer

B Layer 4 - Transport Layer

C Layer 6 - Presentation Layer

D Layer 7 - Application Layer

Correct Answer: C. Layer 6 - Presentation Layer

EXPLANATION

The Presentation Layer (Layer 6) is responsible for data encryption, decryption, compression, and translation, making it the appropriate layer for implementing encryption services.

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Q.74 Medium OSI Model

What is the relationship between the TCP/IP model and the OSI model in terms of functionality?

A They are completely independent and serve different purposes

B The TCP/IP model's Application Layer encompasses OSI Layers 5, 6, and 7

C The TCP/IP model is a replacement that performs identically to the OSI model

D The TCP/IP model operates only at Layers 1-3 of the OSI model

Correct Answer: B. The TCP/IP model's Application Layer encompasses OSI Layers 5, 6, and 7

EXPLANATION

The TCP/IP model's Application Layer combines the functionality of OSI Layers 5 (Session), 6 (Presentation), and 7 (Application).

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Q.75 Medium OSI Model

During a network audit, it is discovered that HTTP traffic is being intercepted and modified. At which minimum OSI layer would a device need to operate to perform this attack?

A Layer 3 - Network Layer

B Layer 4 - Transport Layer

C Layer 5 - Session Layer

D Layer 7 - Application Layer

Correct Answer: D. Layer 7 - Application Layer

EXPLANATION

HTTP is an Application Layer (Layer 7) protocol. To intercept and modify HTTP traffic, an attacker must operate at Layer 7 where the actual content is accessible.

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Q.76 Medium OSI Model

A company experiences intermittent network connectivity issues. When troubleshooting, an administrator discovers that the issue occurs only when data passes through a specific gateway. At which OSI layer(s) should the administrator focus their investigation?

A Layers 1 and 2 only

B Layers 3 and 4 primarily, with possible involvement of Layer 7

C Layer 2 only

D Layer 1 only

Correct Answer: B. Layers 3 and 4 primarily, with possible involvement of Layer 7

EXPLANATION

A gateway typically operates at Layer 3 (routing) and Layer 4 (protocol conversion), and may involve Layer 7 for application-level filtering. Issues at the gateway level suggest Layer 3-4 problems.

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Q.77 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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Q.78 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.79 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.80 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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