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OSI, TCP/IP, protocols, routing, security

100 Q 1 Topics Take Test

Difficulty: All Easy Medium Hard 1–10 of 100

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All OSI Model 100

Q.1 Hard OSI Model

Consider a scenario where a company implements a network segmentation strategy using VLANs to isolate sensitive financial data. An employee in the accounting department cannot access a server despite having proper credentials. The network switch shows the correct VLAN assignment. At which layer is the inter-VLAN routing issue most likely to occur, and what fundamental OSI principle is being tested?

A Layer 2 - VLAN tagging allows switches to segment traffic at the data link layer, but inter-VLAN communication requires a Layer 3 device

B Layer 3 - The router must have routes configured between VLANs, demonstrating that network layer must work across boundaries

C Layer 4 - Transport layer protocols must establish connections before VLAN segmentation takes effect

D Layer 5 - Session layer encryption policies prevent VLAN-to-VLAN communication

Correct Answer: B. Layer 3 - The router must have routes configured between VLANs, demonstrating that network layer must work across boundaries

EXPLANATION

VLANs operate at Layer 2 (Data Link) to segment ports logically, but inter-VLAN communication requires Layer 3 (Network Layer) routing. A router or Layer 3 switch must have routes configured between different VLANs with appropriate subnet masks and routing table entries. This tests the understanding that Layer 2 segmentation requires Layer 3 routing for cross-segment communication, a critical concept in modern network design.

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Q.2 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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Q.3 Easy OSI Model

In the OSI model, which layer is responsible for converting digital data into electrical signals for transmission over physical media?

A Physical Layer (Layer 1)

B Data Link Layer (Layer 2)

C Network Layer (Layer 3)

D Transport Layer (Layer 4)

Correct Answer: A. Physical Layer (Layer 1)

EXPLANATION

The Physical Layer (Layer 1) handles the conversion of data into physical signals (electrical, optical, or radio waves) and manages the hardware transmission of bits over the network medium.

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Q.4 Hard OSI Model

A network service requires authentication, encryption, and session management. These functions span across which OSI layers?

A Layers 4, 5, and 6

B Layers 5, 6, and 7

C Layers 2, 3, and 4

D Layers 6 and 7 only

Correct Answer: B. Layers 5, 6, and 7

EXPLANATION

Authentication and encryption are Presentation Layer (6) functions, while session management is a Session Layer (5) function. Application Layer (7) coordinates these.

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Q.5 Hard OSI Model

In a complex network troubleshooting scenario, packets are being dropped at high rates despite connectivity. Which combination of layers should be investigated?

A Layers 1 and 2 only

B Layers 2, 3, and 4

C Layers 5, 6, and 7

D All layers from 1 to 7

Correct Answer: B. Layers 2, 3, and 4

EXPLANATION

Packet drops can occur due to congestion (Layer 4), routing issues (Layer 3), or hardware problems (Layer 2). Investigation should span these layers.

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Q.6 Hard OSI Model

Which of the following is NOT a function of the Network Layer in the OSI model?

A IP addressing

B Routing

C MAC address resolution

D Logical addressing

Correct Answer: C. MAC address resolution

EXPLANATION

MAC address resolution (ARP) is a Data Link Layer function. The Network Layer handles IP addressing, routing, and logical addressing.

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Q.7 Hard OSI Model

Consider a scenario where VoIP quality degrades due to excessive latency. Which of the following OSI layer mechanisms would BEST address this issue?

A Implementing error correction at Layer 2

B Optimizing routing algorithms at Layer 3

C Implementing priority queuing at Layer 4

D Increasing bandwidth at Layer 1

Correct Answer: C. Implementing priority queuing at Layer 4

EXPLANATION

Priority queuing at the Transport Layer can prioritize VoIP packets, reducing latency. This is a QoS mechanism at Layer 4.

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Q.8 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.9 Hard OSI Model

In a scenario where a network admin needs to monitor traffic patterns and identify applications consuming bandwidth, at which layer should deep packet inspection (DPI) be implemented?

A Network Layer

B Data Link Layer

C Application Layer

D Transport Layer

Correct Answer: C. Application Layer

EXPLANATION

DPI analyzes application-level data, which requires inspection at the Application Layer (Layer 7) to identify specific applications.

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Q.10 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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