Corporate & IT Interview Preparation

Q.1 Medium OSI Model

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

A Transport Layer

B Session Layer

C Presentation Layer

D Application Layer

Correct Answer: C. Presentation Layer

Explanation:

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

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Q.2 Medium OSI Model

Which of the following is NOT a function of the Application Layer (Layer 7)?

A Email communication

B File transfer services

C MAC address resolution

D Web browsing services

Correct Answer: C. MAC address resolution

Explanation:

MAC address resolution (ARP) happens at Layer 2 (Data Link Layer). Layer 7 provides user-facing services like HTTP, SMTP, and FTP.

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Q.3 Medium OSI Model

In the OSI model, which layers are considered the 'Media Layers'?

A Layers 1, 2, and 3

B Layers 4, 5, and 6

C Layers 5, 6, and 7

D Layers 2, 3, and 4

Correct Answer: A. Layers 1, 2, and 3

Explanation:

Layers 1-3 (Physical, Data Link, and Network) are called Media Layers as they deal with network transmission and routing.

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Q.4 Medium OSI Model

Which device operates primarily at Layer 3 of the OSI model?

A Hub

B Switch

C Router

D Repeater

Correct Answer: C. Router

Explanation:

Routers operate at Layer 3 and use IP addresses to route packets between different networks. Hubs and repeaters work at Layer 1, switches at Layer 2.

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Q.5 Medium OSI Model

TCP/IP model has fewer layers than the OSI model. How many layers does the TCP/IP model have?

A 3 layers

B 4 layers

C 5 layers

D 6 layers

Correct Answer: B. 4 layers

Explanation:

The TCP/IP model has 4 layers: Link, Internet, Transport, and Application layers. Some variations include 5 layers by splitting the Link layer.

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Q.6 Medium OSI Model

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

A Physical Layer

B Data Link Layer

C Network Layer

D Transport Layer

Correct Answer: B. Data Link Layer

Explanation:

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

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Q.7 Medium OSI Model

Which of the following scenarios requires Layer 7 (Application Layer) involvement?

A Converting binary data to decimal format

B Establishing a secure HTTPS connection to a website

C Assigning IP addresses to devices

D Creating physical connections using Ethernet cables

Correct Answer: B. Establishing a secure HTTPS connection to a website

Explanation:

HTTPS (web browsing) is an Application Layer protocol. A, C, and D belong to Presentation, Network, and Physical layers respectively.

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Q.8 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.9 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.10 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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