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

The correct answer is B: Layers 2, 3, and 4. Packet drops can occur due to congestion (Layer 4), routing issues (Layer 3), or hardware problems (Layer 2). Investigation should span these layers.

Which protocol operates at the Data Link Layer and is primarily used in Ethernet networks?

The correct answer is C: MAC (Media Access Control) / 802.3. MAC and 802.3 standards operate at the Data Link Layer (Layer 2). They define how devices access and share Ethernet transmission media using MAC addresses.

The Physical Layer of the OSI model deals with which of the following?

The correct answer is C: Electrical signals, cables, and hardware devices. Layer 1 (Physical Layer) handles the actual transmission of raw bits over physical media like cables, fiber optics, and wireless signals.

During a network analysis, it is observed that frames are being retransmitted at a specific layer due to collision detection. Which layer implements CSMA/CD (Carrier Sense Multiple Access/Collision Detection)?

The correct answer is B: Data Link Layer (Layer 2). CSMA/CD is implemented at the Data Link Layer (Layer 2), specifically in Ethernet technology. It detects collisions and handles frame retransmission at the local network level.

Consider a scenario where a web server responds to a client request. Trace the data flow: which layer encapsulates the HTTP response into segments before transmission?

The correct answer is B: Transport Layer encapsulates into segments/datagrams. The HTTP response originates at Layer 7 (Application), but the Transport Layer (Layer 4) encapsulates it into TCP segments or UDP datagrams. This is the proper encapsulation step at Layer 4.

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Networking

OSI, TCP/IP, protocols, routing, security

45 Q 1 Topics Take Mock Test

Difficulty: All Easy Medium Hard 41–45 of 45

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All OSI Model 100

Q.41 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.

Test

Q.42 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.

Test

Q.43 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.

Test

Q.44 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.

Test

Q.45 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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