Corporate & IT Interview Preparation

Networking

Aptitude · Reasoning · English · CS — Corporate & Campus Interview Prep

45 Questions 10 Topics Take Test

Showing 41–45 of 45 questions

Q.41 Medium OSI Model

Which of the following statements about the OSI model is correct?

A All layers must be implemented in hardware

B Lower layers operate independently of upper layers

C Each layer provides services to the layer above it

D The Physical Layer is the most important layer

Correct Answer: C. Each layer provides services to the layer above it

Explanation:

The OSI model is designed such that each layer provides services to the layer above it, following a hierarchical structure.

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Q.42 Medium OSI Model

An organization implements end-to-end encryption for all data transfers. At which OSI layer is this encryption most commonly implemented?

A Physical Layer

B Presentation Layer

C Session Layer

D Application Layer

Correct Answer: B. Presentation Layer

Explanation:

While encryption can occur at multiple layers, the Presentation Layer (Layer 6) is traditionally responsible for encryption and decryption of data.

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Q.43 Medium OSI Model

What is the primary difference between a hub and a switch in terms of OSI layers?

A Hub operates at Layer 1, Switch operates at Layer 2

B Hub operates at Layer 2, Switch operates at Layer 3

C Hub operates at Layer 3, Switch operates at Layer 4

D Both operate at the same layer but with different functions

Correct Answer: A. Hub operates at Layer 1, Switch operates at Layer 2

Explanation:

A hub operates at the Physical Layer (1) and broadcasts all data, while a switch operates at the Data Link Layer (2) using MAC addresses.

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Q.44 Medium OSI Model

A firewall configured to block all traffic on port 443 is operating at which OSI layer?

A Network Layer

B Transport Layer

C Application Layer

D Session Layer

Correct Answer: B. Transport Layer

Explanation:

Port numbers are used at the Transport Layer (Layer 4) by TCP and UDP protocols. A firewall blocking specific ports operates at this layer.

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Q.45 Medium OSI Model

A network administrator observes that devices on different subnets cannot communicate despite being connected to the same router. The devices have valid IP addresses and can ping the router. At which OSI layer should the administrator focus troubleshooting, and what is the most likely issue?

A Layer 2 - MAC address filtering is blocking inter-subnet traffic

B Layer 3 - Routing rules or ACLs are preventing inter-subnet communication

C Layer 4 - Port numbers are incorrectly configured on the router

D Layer 1 - Physical cable connections between router ports are faulty

Correct Answer: B. Layer 3 - Routing rules or ACLs are preventing inter-subnet communication

Explanation:

Inter-subnet communication requires Layer 3 (Network Layer) routing decisions. Since devices can ping the router, Layer 1 and 2 are functional. The issue is typically Layer 3 routing rules, subnet masks, or Access Control Lists (ACLs) preventing the router from forwarding packets between subnets.

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