Networking Quiz: OSI Model Layers

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Questions and Answers

Which of the following are layers of the OSI reference model? (Select three.)

WAN Layer

Transmission Layer

Connection Layer

Session Layer (correct)

Presentation Layer (correct)

Application Layer (correct)

Encryption Layer

What is a Protocol Data Unit (PDU)?

A type of encryption used in data transmission

A chunk of data with protocol-specific headers added at each OSI layer (correct)

A measure of data transmission speed

A device that manages data transmission rates

What is the primary purpose of data encapsulation in network protocols?

To convert data into an analog signal for transmission

To compress data for faster transmission

To encrypt data for secure transmission

To add additional data headers for routing and delivery (correct)

An engineer uses a type of network adapter to connect a fiber link to a router. The transceiver fits into an optical interface on a layer 3 Ethernet router. Of the choices, which layer 1 implementation does the engineer utilize?

Media converter Signup and view all the answers

A communications engineer notices that every time it rains the signal becomes very degraded. Which layer of the OSI model is the engineer most likely troubleshooting?

Physical Signup and view all the answers

Which of the following devices operate at the Data Link layer of the OSI model? (Select three.)

Switches Signup and view all the answers

When the Data Link layer performs encapsulation, it adds control information to the payload in the form of header fields. Which of the following are header fields added by the Data Link layer during encapsulation? (Select three.)

Source hardware address Signup and view all the answers

What is the role of an Access Control List (ACL) at Layer 3 (Network layer) of the OSI model?

To filter network traffic by permitting or blocking packets based on IP addresses and other criteria Signup and view all the answers

In the OSI model, what is the primary function of the Network layer?

The primary function of the Network layer is to move data around an internetwork using logical network and host IDs. Signup and view all the answers

Which of the following functions are performed by the OSI Transport layer? (Select three.)

Reliable message delivery Signup and view all the answers

A security engineer configures software-based port security on a hardware firewall. Which OSI model layer identifies the application ports to configure?

Layer 4 Signup and view all the answers

What role does the Presentation layer (layer 6) of the OSI model play in terms of data compression and encryption?

The Presentation layer supports data compression and encryption to prepare data for network transmission. Signup and view all the answers

Which of the following statements accurately describes the function of the Session layer (layer 5) in the OSI model?

The Session layer administers the process of establishing, managing, and terminating a dialog between client and server. Signup and view all the answers

Match each networking function or device on the left with its associated OSI model layer on the right.

Application layer = HTTP Presentation layer = Translates data Session layer = Session ID number Transport layer = Port number Network layer = Router Data Link layer = Switch Signup and view all the answers

A network engineer is designing a network in various offices to create multiple broadcast domains. Each has its own Virtual Local Area Network (VLAN). When configuring these multiple broadcast domains on the switch, the switch will be operating at what layer of the OSI model?

Layer 2 (Data Link Layer) Signup and view all the answers

Study Notes

Lesson Review Summary

Candidate: Tai Chun Sam (sam33)
Date: 12/26/2024
Time Spent: 32:38
Score: 80%
Passing Score: 80%

OSI Model Layers

Application Layer (Layer 7): Provides network services to applications, including email and file transfer.
Presentation Layer (Layer 6): Handles data translation, encryption, and compression, ensuring data is readable for the Application Layer.
Session Layer (Layer 5): Establishes, manages, and terminates connections between applications; responsible for dialogues.
Transport Layer (Layer 4): Provides transparent end-to-end data transfer.
Network Layer (Layer 3): Responsible for logical addressing and routing data packets between networks.
Data Link Layer (Layer 2): Transfers data between nodes on the same logical segment. Uses MAC addresses to identify devices.
Physical Layer (Layer 1): Transmits and receives raw data bits over a physical medium.

Protocol Data Unit (PDU)

A PDU is a structured form of data handled by network protocols. It has protocol-specific headers and footers added at each layer of the OSI model during data transmission.
A PDU pertains to the structured format of data within network protocols, not a measure of speed or a method of encryption.

Data Encapsulation

Data encapsulation is a fundamental networking process where data is wrapped with protocol-specific headers at each OSI layer during transmission.
Purpose: to organize data for transmission and to add essential information like source and destination addresses.
Data encapsulation does not involve encryption or data compression, although those may be used along with encapsulation.

Layer 1 Implementation

Media Converter: A layer 1 device that converts one type of cable to another to match different network cables.

Layer 2 (Data Link Layer) Devices

Network interface cards (NICs): Function in the Data Link layer and use the physical device address (MAC address) for packet identification.
Bridges: Operate at Layer 2; connect different networks as if they were one.
Switches: Function at Layer 2 and use MAC addresses to direct data packets.

Layer 1 Troubleshooting

Physical Layer: Troubleshooting the physical layer is relevant for signal degradation issues due to environmental factors such as rain.

Access Control List (ACL) at Layer 3

ACLs at Layer 3 establish security policies by filtering network traffic based on IP addresses, protocol types, ports, and other criteria.
ACLs are not responsible for packet size or for routing protocols.

Network Layer (Layer 3) Function

The Network Layer (Layer 3) is primarily responsible for moving data across networks using logical network and host IDs.
It handles the logical addressing of data.
Routers operate at this layer and make forwarding decisions based on the information contained in the packet headers.

Transport Layer (Layer 4) Functions

Data segmentation and reassembly: The Transport Layer breaks down upper-layer data into segments for reliable transmission.
End-to-end flow control: The Transport layer manages the flow of data between devices.
Reliable message delivery: The Transport Layer ensures data is properly delivered.

Presentation Layer (Layer 6)

The Presentation Layer transforms data to ensure it is in the correct format for the application.
Data transformation and representation occurs at this layer.

Session Layer (Layer 5)

Manages the communication session by establishing, managing, and terminating dialogues between client and server.

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Description

Test your knowledge on the OSI Model layers and their functions in networking. This quiz covers the seven layers from the Application Layer to the Physical Layer, helping you understand how data is processed and transmitted in a network. Perfect for students and professionals looking to reinforce their understanding of network architecture.