Trivia Quiz On CompTIA Network+ OSI Model
The Open Systems Interconnection model (OSI model) is an abstract model which was developed by ISO(International Organization of Standardization) in the year 1974. It's a 7 layer architecture which identifies and systematize the communication functions of a telecommunication or computing system. This quiz has been developed to test your knowledge about the process and layers of the OSI model. So, let's try out the quiz. All the best!
Questions and Answers
- 1.
PDU of layers 1 through 4 are what?
- A.
At layer 4 the PDU is a segment. At layer 3 they are a packet. At layer 2 a frame, at layer 1 bits.
- B.
At layer 4 the PDU is a frame. At layer 3 they are a segment. At layer 2 bits, at layer 1 a frame.
- C.
At layer 4 the PDU is bits. At layer 3 a frame, at layer 2 a segment. At layer 1 a packet.
- D.
All are packets
Correct Answer
A. At layer 4 the PDU is a segment. At layer 3 they are a packet. At layer 2 a frame, at layer 1 bits.Explanation
The given answer correctly explains the Protocol Data Units (PDU) at each layer of the OSI model. At layer 4, the PDU is a segment. At layer 3, they are packets. At layer 2, they are frames. And at layer 1, they are represented as bits. This explanation aligns with the standard understanding of how data is encapsulated and processed at each layer of the OSI model.Rate this question:
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- 2.
IEEE 802.3 is?
- A.
Logical Link Control
- B.
Fiber Optic
- C.
Wireless Network
- D.
Ethernet
Correct Answer
D. EthernetExplanation
IEEE 802.3 is a standard that defines the Ethernet protocol, which is widely used for wired local area networks (LANs). It specifies the physical and data link layer protocols for the transmission of data over Ethernet networks. Ethernet is a reliable and widely adopted technology that allows for the efficient and secure transfer of data between devices on a network. It uses a wired connection, typically using copper or fiber optic cables, to transmit data packets.Rate this question:
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- 3.
In the Application Layer what applications run in this layer?
- A.
Applications like M$ Word, Excel, etc.
- B.
Protocols like HTTP, FTP, POP3, etc.
- C.
TCP, UDP
Correct Answer
B. Protocols like HTTP, FTP, POP3, etc.Explanation
In the Application Layer, various protocols like HTTP, FTP, and POP3 run. This layer is responsible for providing services and support to end-user applications. These protocols enable the communication and transfer of data between different applications over a network. Applications like M$ Word and Excel are not specific to the Application Layer and can run on top of the protocols provided by this layer. TCP and UDP are transport layer protocols and do not run directly in the Application Layer.Rate this question:
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- 4.
What is Layer 1 called? (to be sure you got the answer right; type it all in lower case).
Correct Answer
physicalExplanation
Layer 1 in networking is called the physical layer. This layer is responsible for the actual physical transmission of data over the network. It deals with the electrical, mechanical, and physical aspects of transmitting data, such as the cables, connectors, and network devices. The physical layer ensures that the data is converted into a format that can be transmitted over the network medium, such as bits or electrical signals. It also handles tasks like data encoding, synchronization, and error detection.Rate this question:
- 5.
What are the most important layers of the OSI Model to networkers?
- A.
The first 4 layers (I hope you know what layers are the first four)
- B.
The last 4 layers
- C.
The middle 3 layers
- D.
Only important layer is the physical layer
Correct Answer
A. The first 4 layers (I hope you know what layers are the first four)Explanation
The first 4 layers of the OSI Model are the most important to networkers because they are directly involved in the communication process between devices on a network. These layers include the Physical layer, which deals with the physical transmission of data; the Data Link layer, which handles the framing and error detection of data; the Network layer, responsible for addressing and routing data packets; and the Transport layer, which ensures reliable delivery of data between end systems. These layers provide the foundation for network communication and are essential for networkers to understand and troubleshoot network issues.Rate this question:
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- 6.
IEEEs 802.11 is?
- A.
Token Ring
- B.
Fiber Optic
- C.
Wireless
- D.
Ethernet
Correct Answer
C. WirelessExplanation
IEEE 802.11 refers to the set of standards for wireless local area networks (WLANs). It defines the protocols and specifications for wireless communication, allowing devices to connect and communicate wirelessly. This technology enables the establishment of wireless networks, providing flexibility and mobility for users to access the internet and share resources without the need for physical cables. Therefore, the correct answer is "Wireless."Rate this question:
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- 7.
What standards organization created the OSI Model
- A.
ANSI
- B.
ISO
- C.
IEEE
- D.
TIA/EIA
Correct Answer
B. ISOExplanation
ISO, or the International Organization for Standardization, is the standards organization that created the OSI (Open Systems Interconnection) Model. The OSI Model is a conceptual framework that defines the functions and protocols used in computer networks. It consists of seven layers, each responsible for a specific aspect of network communication. ISO's creation of the OSI Model has provided a standardized approach to network architecture and has greatly contributed to the interoperability of different network devices and systems.Rate this question:
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- 8.
Can you skip layers in the OSI Model?
- A.
Yes
- B.
No
- C.
It depends on the situation
Correct Answer
B. NoExplanation
In the OSI Model, each layer has a specific function and is designed to work in conjunction with the layers above and below it. Skipping layers would disrupt the flow of communication and compromise the integrity of the network. Therefore, it is not possible to skip layers in the OSI Model.Rate this question:
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- 9.
IEEE 802.2 is?
- A.
Logical link control
- B.
Ethernet
- C.
Fiber Optic
- D.
Token Ring
Correct Answer
A. Logical link controlExplanation
IEEE 802.2 refers to the Logical Link Control (LLC) sublayer of the Data Link Layer in the IEEE 802 networking standards. The LLC sublayer is responsible for managing communication between network devices, providing error control, flow control, and addressing. It ensures reliable data transmission over the physical medium and enables interoperability between different network protocols. Ethernet, Fiber Optic, and Token Ring are different physical layer technologies that can be used in conjunction with the LLC sublayer.Rate this question:
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- 10.
What does the Presentation layer do?
- A.
It presents the data given to you
- B.
It does nothing it's just another layer to confuse people who want to get into networking
- C.
It encrypts, decrypts, and agrees upon a format to send a file
Correct Answer
C. It encrypts, decrypts, and agrees upon a format to send a fileExplanation
The Presentation layer is responsible for encrypting and decrypting data, as well as agreeing upon a format to send a file. This layer ensures that the data is securely transmitted by encrypting it before sending and decrypting it upon receipt. It also handles the conversion of data into a format that can be understood by the receiving system. This ensures that the data is properly presented and can be interpreted correctly by the application layer.Rate this question:
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- 11.
Which layer does this belong to? _______ Layer Establishes a connection (and keeps it) with the other node(s).
- A.
Session
- B.
Presentation
- C.
Transport
- D.
Network
- E.
Data Link
Correct Answer
A. SessionExplanation
The session layer is responsible for establishing, managing, and terminating connections between nodes. It ensures that a connection is established and maintained throughout the communication session. This layer handles session establishment, synchronization, and coordination between the sender and receiver. It also manages session checkpoints and recovery in case of any disruptions. Therefore, the given answer, "Session," is correct as it accurately describes the layer responsible for establishing and maintaining connections with other nodes.Rate this question:
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- 12.
What layer does SYN and SYN-ACKs have to deal with?
- A.
Physical
- B.
Network
- C.
Transport
- D.
Data Link
- E.
Application
Correct Answer
C. TransportExplanation
SYN and SYN-ACKs are part of the TCP (Transmission Control Protocol) three-way handshake process, which establishes a connection between two devices over a network. This process occurs at the transport layer of the OSI model. The transport layer is responsible for ensuring reliable data transmission between the source and destination devices. Therefore, SYN and SYN-ACKs have to deal with the transport layer.Rate this question:
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- 13.
What data gets put into a frame/packet/segment at layer 4?
- A.
Source IP, Destination IP, TTL
- B.
Source Port, Destination Port, and Sequence Number
- C.
Destination MAC, Source MAC, and Framecheck
Correct Answer
B. Source Port, Destination Port, and Sequence NumberExplanation
At layer 4, which is the transport layer, the data that gets put into a frame/packet/segment includes the Source Port, Destination Port, and Sequence Number. These elements are essential for establishing a connection between the source and destination devices. The Source Port identifies the sending application or process, the Destination Port identifies the receiving application or process, and the Sequence Number helps in ensuring the correct order of data transmission and reception.Rate this question:
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- 14.
What data gets put into a frame/packet/segment at layer 3?
- A.
Source IP, Destination IP, TTL
- B.
Source Port, Destination Port, and Sequence Number
- C.
Destination MAC, Source MAC, and Framecheck
Correct Answer
A. Source IP, Destination IP, TTLExplanation
At layer 3, which is the network layer, the data that gets put into a frame/packet/segment includes the Source IP address, Destination IP address, and the Time-to-Live (TTL) value. The Source IP address identifies the sender of the data, the Destination IP address identifies the intended recipient, and the TTL value represents the maximum number of hops or routers the data can pass through before it is discarded.Rate this question:
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- 15.
What data gets put into a frame/packet/segment at layer 2?
- A.
Destination MAC, Source MAC, and Framecheck
- B.
Source Port, Destination Port, and Sequence Number
- C.
Source IP, Destination IP, TTL
Correct Answer
A. Destination MAC, Source MAC, and FramecheckExplanation
At layer 2 of the OSI model, which is the Data Link layer, a frame is created to encapsulate the data. This frame includes the Destination MAC address, which specifies the intended recipient of the frame, and the Source MAC address, which identifies the sender of the frame. Additionally, a Framecheck value is included to ensure data integrity during transmission. This value is used to detect errors in the frame and ensure that the data is received correctly.Rate this question:
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- 16.
At layer 1 what gets added to the packet?
- A.
Fall out number
- B.
Port number
- C.
Nothing gets added to it. It's changed into bits and sent over the medium
- D.
Nothing gets added as you cannot do anything at this layer.
Correct Answer
C. Nothing gets added to it. It's changed into bits and sent over the mediumExplanation
At layer 1 of the OSI model, which is the physical layer, no additional information or headers are added to the packet. The data is simply converted into bits and transmitted over the medium. This layer is responsible for the actual transmission of the data, so no additional information is added to the packet at this stage.Rate this question:
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- 17.
If there are two NICs on the same network with the SAME MAC address what will happen to the network?
- A.
It will come tumbling down
- B.
Nothing
- C.
Speed will increase ten fold
Correct Answer
A. It will come tumbling downExplanation
If there are two NICs on the same network with the same MAC address, it will create a conflict in the network. The MAC address is a unique identifier assigned to each network interface card, and it is used to ensure that data is sent to the correct device. When two NICs have the same MAC address, the network will not be able to differentiate between the two devices, leading to confusion and disruption in communication. This conflict can cause network errors, dropped connections, and overall instability, eventually resulting in the network coming tumbling down.Rate this question:
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- 18.
UDP and TCP are in what layer(s)?
- A.
Transport AND Session
- B.
Physical Layer
- C.
Physical Layer AND Network Layer
- D.
Transport ONLY
Correct Answer
D. Transport ONLYExplanation
UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) are both transport layer protocols in the OSI model. The transport layer is responsible for providing end-to-end communication between hosts and ensuring reliable data delivery. UDP is a connectionless protocol that provides fast and lightweight communication, while TCP is a connection-oriented protocol that provides reliable and ordered data delivery. Therefore, the correct answer is "Transport ONLY" as both UDP and TCP belong to the transport layer.Rate this question:
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- 19.
A ___________ is a unique character string that allows the receiving node to determine if an arriving data unit matches exactly the data unit sent by the source. (TYPE THE ANSWER IN LOWER CASE ONLY)
Correct Answer
checksumExplanation
A checksum is a unique character string that allows the receiving node to determine if an arriving data unit matches exactly the data unit sent by the source. It is used to verify the integrity of the data during transmission and detect any errors or corruption that may have occurred.Rate this question:
- 20.
The 3 stars of layer 4 are: (3 answers)
- A.
Source Port
- B.
Destination Port
- C.
Destination IP
- D.
Source IP
- E.
Sequence Number
Correct Answer(s)
A. Source Port
B. Destination Port
E. Sequence NumberExplanation
The correct answer is Source Port, Destination Port, and Sequence Number. These three elements are part of the TCP (Transmission Control Protocol) header in layer 4 of the OSI model. The Source Port identifies the application or process sending the data, the Destination Port identifies the application or process receiving the data, and the Sequence Number ensures the correct order of the segments during transmission. The Destination IP and Source IP are part of layer 3 (Network layer) and are not specifically related to layer 4.Rate this question:
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- 21.
The 3 stars of layer 3 are: (3 answers)
- A.
Destination MAC
- B.
Destination IP
- C.
Source MAC
- D.
Source IP
- E.
TTL
Correct Answer(s)
B. Destination IP
D. Source IP
E. TTLExplanation
Layer 3 of the OSI model is the network layer, responsible for routing and forwarding data packets across different networks. In this layer, the network addresses are used to identify the source and destination of the data packets. The Destination IP and Source IP are the network addresses of the destination and source devices respectively. TTL stands for Time to Live and is a field in the IP header that determines the maximum number of hops a packet can take before being discarded. Therefore, the correct answer includes Destination IP, Source IP, and TTL as these are all important elements in the network layer.Rate this question:
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- 22.
Name all of the OSI model layers starting from 1 to 7. (do not include "layer" in any of your answers, all answers should be in lowercase, do not include commas either)
Correct Answer(s)
physical data link network transport session presentation applicationExplanation
The OSI model is a conceptual framework that helps to understand how network protocols work together. It consists of seven layers, each with its own specific functions. The correct answer lists all the layers in the correct order from 1 to 7: physical, data link, network, transport, session, presentation, and application. These layers are arranged in a hierarchical manner, with each layer building upon the services provided by the layer below it.Rate this question:
- 23.
The 3 stars of layer 2 are: (3 answers)
- A.
Destination MAC
- B.
Destination IP
- C.
Source MAC
- D.
Framecheck (FCS)
- E.
TTL
Correct Answer(s)
A. Destination MAC
C. Source MAC
D. Framecheck (FCS)Explanation
Layer 2 of the OSI model is the Data Link Layer, responsible for the reliable transmission of data frames between adjacent network nodes. In this layer, the data frames are encapsulated with MAC addresses, which are unique identifiers for the source and destination devices on a local network. Therefore, the correct answers are Destination MAC and Source MAC. Framecheck (FCS) is also a part of layer 2, as it is a mechanism used to ensure the integrity of the data being transmitted.Rate this question:
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- 24.
What layer does 802.11/802.3/802.5 belong to?
- A.
Physical
- B.
Data Link
- C.
Presentation
- D.
Assumption
- E.
Classification
Correct Answer
A. PhysicalExplanation
802.11, 802.3, and 802.5 are all standards for wireless (Wi-Fi), Ethernet, and Token Ring networks respectively. These standards define the physical characteristics and specifications for transmitting data over these networks, such as the type of cables, connectors, and signaling methods used. Therefore, these standards belong to the Physical layer of the OSI model, which is responsible for the actual transmission and reception of data signals over the physical medium.Rate this question:
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- 25.
The 3 stars of layer 1 are: (maybe 3 answers (trick question))
- A.
Destination MAC
- B.
Destination IP
- C.
Destination Port
- D.
THIS IS FILLER YOU MUST SELECT THIS ANSWER TO GET THIS QUESTION CORRECT
- E.
There is only 1 star to this layer and that is that it converts data from the Data Link layer into bits to be sent over the medium
Correct Answer(s)
D. THIS IS FILLER YOU MUST SELECT THIS ANSWER TO GET THIS QUESTION CORRECT
E. There is only 1 star to this layer and that is that it converts data from the Data Link layer into bits to be sent over the mediumExplanation
The explanation for this answer is that the statement accurately describes the function of the Physical layer in the OSI model. The Physical layer is responsible for converting data from the Data Link layer into bits, which can be transmitted over the physical medium. This layer handles the actual transmission of data, including encoding, modulation, and transmission rate control. Therefore, the answer correctly identifies the key function of the Physical layer.Rate this question:
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- 26.
Which part of the MAC address is unique to each manufacturer?
- A.
Block ID
- B.
Segment ID
- C.
Housing ID
- D.
Manufacturer ID
Correct Answer
A. Block IDExplanation
The Block ID is the part of the MAC address that is unique to each manufacturer. This identifier is assigned by the Institute of Electrical and Electronics Engineers (IEEE) and is used to identify the organization or manufacturer that produced the network interface card (NIC) or device. Each manufacturer is assigned a unique Block ID, allowing for easy identification of the device's origin.Rate this question:
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- 27.
I establish, maintain, and terminate user connections. What OSI Model Layer am I? (submit answer in lowercase)
Correct Answer
sessionExplanation
The correct answer is "session." In the OSI model, the session layer is responsible for establishing, maintaining, and terminating connections between users. This layer manages the communication sessions and ensures that data is transmitted smoothly between the sender and receiver. It handles tasks such as session establishment, synchronization, and session termination.Rate this question:
- 28.
I package data in frames appropriate to network the network transmission method. What OSI Model Layer am I? (submit answer in lowercase)
Correct Answer
data linkExplanation
The correct answer is "data link". In the OSI model, the data link layer is responsible for packaging data into frames that are suitable for network transmission. This layer ensures error-free and reliable transmission of data over the physical network. It also handles addressing and flow control between nodes on the same network.Rate this question:
- 29.
I allow hosts and applications to use a common language. I perform data formatting, encryption, and compression. What OSI Model Layer am I? (submit answer in lowercase)
Correct Answer
presentationExplanation
The correct answer is "presentation" because the description provided aligns with the responsibilities of the Presentation layer in the OSI Model. This layer is responsible for data formatting, encryption, and compression, and it allows hosts and applications to communicate using a common language.Rate this question:
- 30.
What standards organization has established guidelines for installing network cables in commercial buildings?
- A.
ITU
- B.
IEEE
- C.
ANSI
- D.
TIA/EIA
Correct Answer
D. TIA/EIAExplanation
The correct answer is TIA/EIA. TIA/EIA, which stands for Telecommunications Industry Association/Electronic Industries Alliance, is a standards organization that has established guidelines for installing network cables in commercial buildings. They provide standards and recommendations for various aspects of network cabling, including installation practices, cable types, and performance requirements. These guidelines ensure that network cables are installed correctly and meet the necessary standards for reliable and efficient network connectivity in commercial buildings.Rate this question:
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- 31.
802.8 is a ________ network. (two words, DO NOT CAPITALIZE)
Correct Answer
fiber opticExplanation
The correct answer for this question is "fiber optic" because 802.8 is a type of network that uses fiber optic technology. Fiber optic networks transmit data using light signals through thin strands of glass or plastic fibers, allowing for high-speed and long-distance communication.Rate this question:
- 32.
I ensure accurate delivery of data through flow control, segmentation and reassembly, error correction, and acknowledgment. What OSI Model Layer am I? (submit answer in lowercase)
Correct Answer
transportExplanation
The explanation for the given correct answer is that the mentioned techniques of flow control, segmentation and reassembly, error correction, and acknowledgment are all functions performed by the Transport layer of the OSI Model. This layer is responsible for ensuring reliable and efficient communication between end systems. It breaks down the data into smaller segments, ensures they are delivered without errors, and manages the flow of data to prevent congestion.Rate this question:
- 33.
I provide the interface between software applications and network for interpreting application requests and requirements. What OSI Model Layer am I? (submit answer in all lower case)
Correct Answer
applicationExplanation
The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers. The application layer is the topmost layer in the OSI model and is responsible for providing services directly to the end-user applications. It acts as an interface between software applications and the network, interpreting application requests and requirements. Therefore, the correct answer is "application."Rate this question:
- 34.
I establish network connections and translate network addresses into their physical counterparts and determine routing. What OSI Model Layer am I? (submit answer in lowercase)
Correct Answer
networkExplanation
The correct answer is "network" because the given description matches the responsibilities and functions of the network layer in the OSI model. This layer is responsible for establishing network connections, translating network addresses into physical addresses, and determining routing for data packets.Rate this question:
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