Networking MCQ Questions

Q.51 Medium OSI Model

During a network troubleshooting session, a technician finds that DNS resolution fails while DHCP assignment succeeds. Which layers are functioning and which is failing?

A Layers 1-3 working; Layer 7 failing

B Layers 1-2 working; Layer 3 failing

C Layers 1-4 working; Layer 7 failing

D All layers working; application configuration issue

Correct Answer: C. Layers 1-4 working; Layer 7 failing

EXPLANATION

DHCP (Layer 4) works, so Layers 1-4 are functional. DNS resolution failure indicates an issue at the Application Layer (Layer 7) or network configuration.

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Q.52 Medium OSI Model

A company deploys a VPN solution. At which OSI layer does the VPN primarily encrypt data before transmission?

A Physical Layer

B Network Layer

C Presentation Layer

D Session Layer

Correct Answer: C. Presentation Layer

EXPLANATION

VPNs perform encryption/decryption at the Presentation Layer, though some VPN implementations also work at Layer 3 for IP-level protection.

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Q.53 Medium OSI Model

Which statement correctly describes the relationship between protocols and OSI layers?

A Each protocol operates at only one OSI layer

B Some protocols span multiple OSI layers

C All protocols operate at the Application Layer

D Protocols cannot cross layer boundaries

Correct Answer: B. Some protocols span multiple OSI layers

EXPLANATION

Protocols like TCP/IP stack operate across multiple layers; HTTP spans layers 6-7, while TCP operates at layer 4.

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Q.54 Medium OSI Model

When a web browser displays encrypted HTTPS content correctly on the user's screen, which layers have successfully completed their functions in the correct sequence?

A Layers 4, 5, 6, 7 only

B Layers 1 through 7

C Layers 3, 4, 5, 6, 7 only

D Layers 2, 4, 6, 7 only

Correct Answer: B. Layers 1 through 7

EXPLANATION

All seven layers must function correctly: physical transmission (1), framing (2), routing (3), TCP connection (4), session (5), decryption (6), and HTML rendering (7).

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Q.55 Medium OSI Model

A network administrator notices that devices can connect physically but cannot communicate. After checking cables and signals, the issue remains. Which layers should be investigated?

A Layers 1 and 2 only

B Layers 3 and 4 only

C Layers 2 and 3

D All layers from 1 to 7

Correct Answer: C. Layers 2 and 3

EXPLANATION

Physical connectivity (Layer 1) works, so the issue is likely at Layer 2 (MAC addressing/switching) or Layer 3 (IP routing/addressing).

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Q.56 Medium OSI Model

An organization implements Quality of Service (QoS) policies for video streaming. At which OSI layer would bandwidth prioritization rules primarily be enforced?

A Physical Layer

B Data Link Layer

C Transport Layer

D Application Layer

Correct Answer: C. Transport Layer

EXPLANATION

QoS policies are typically enforced at the Transport Layer using protocols like DSCP and traffic shaping techniques to prioritize critical traffic.

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Q.57 Easy OSI Model

In the context of the OSI model, which layer is responsible for establishing, maintaining, and terminating connections?

A Transport Layer

B Session Layer

C Presentation Layer

D Network Layer

Correct Answer: B. Session Layer

EXPLANATION

The Session Layer (Layer 5) manages dialog control, session establishment, maintenance, and termination between applications.

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Q.58 Easy OSI Model

What is the primary function of the Presentation Layer (Layer 6) in the OSI model?

A Establishing and managing sessions

B Data encryption, compression, and translation

C Physical transmission of bits

D IP address resolution

Correct Answer: B. Data encryption, compression, and translation

EXPLANATION

Layer 6 handles data formatting, encryption, compression, and conversion between different character sets and formats for application compatibility.

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Q.59 Easy OSI Model

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

A HTTP

B TCP/UDP

C ARP

D OSPF

Correct Answer: B. TCP/UDP

EXPLANATION

TCP and UDP are Transport Layer protocols that manage end-to-end communication, reliability, and port-based services.

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Q.60 Easy OSI Model

At which OSI layer do switches operate to forward frames based on MAC addresses?

A Physical Layer

B Data Link Layer

C Network Layer

D Session Layer

Correct Answer: B. Data Link Layer

EXPLANATION

Switches operate at Layer 2 (Data Link Layer) and use MAC address tables to forward frames to appropriate ports within a LAN.

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