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

The correct answer is A: Network Layer (Layer 3). The Network Layer (Layer 3) handles routing, IP addressing, and logical addressing to move data across different networks using routers.

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

The correct answer is B: Layer 2 - Data Link Layer. Switches operate at Layer 2 (Data Link Layer) and use MAC address tables to forward frames to appropriate ports.

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).

When implementing network monitoring with packet sniffing at multiple layers, which combination accurately represents the data structures captured at each layer?

The correct answer is A: Layer 2: Frames; Layer 3: Packets; Layer 4: Segments/Datagrams. Layer 2 creates Frames with MAC addresses, Layer 3 creates Packets with IP addresses, and Layer 4 creates Segments (TCP) or Datagrams (UDP).

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Networking

OSI, TCP/IP, protocols, routing, security

45 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–40 of 45

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All OSI Model 100

Q.31 Medium OSI Model

A packet sniffer tool captures data at Layer 2. Which information would be visible in the captured frames?

A IP addresses and port numbers

B MAC addresses and frame structure

C Application-level data and HTTP headers

D DNS queries and domain names

Correct Answer: B. MAC addresses and frame structure

EXPLANATION

Layer 2 (Data Link Layer) operates with MAC addresses and frames. IP addresses (Layer 3) and application data (Layer 7) would not be directly visible at Layer 2 without further analysis.

Test

Q.32 Medium OSI Model

Which of the following statements correctly describes the role of the Session Layer (Layer 5) in the OSI model?

A It handles physical transmission of data over network media

B It manages conversations between applications, including establishing, maintaining, and terminating sessions

C It converts data into appropriate formats for different operating systems

D It performs routing and logical addressing of data packets

Correct Answer: B. It manages conversations between applications, including establishing, maintaining, and terminating sessions

EXPLANATION

The Session Layer (Layer 5) manages dialogues between applications, handling session establishment, maintenance, synchronization, and termination.

Test

Q.33 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.

Test

Q.34 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.

Test

Q.35 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.

Test

Q.36 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).

Test

Q.37 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.

Test

Q.38 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.

Test

Q.39 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.

Test

Q.40 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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