Computer Networks Quiz

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Questions and Answers

What is the definition of a computer network?

Two or more connected computers that share a resource such as data, a printer, an internet connection, applications, or a combination of these.

Which of the following are the three most common types of networks?

  • Wireless Area Network (WAN)
  • Metropolitan Area Network (MAN) (correct)
  • Wide Area Network (WAN) (correct)
  • Local Area Network (LAN) (correct)
  • Internet Protocol (IP)

What is the main function of a Local Area Network (LAN)?

  • To allow many users to access high-bandwidth media (correct)
  • To connect geographically dispersed networks
  • To connect devices within a limited geographic area (correct)
  • To provide full-time connectivity to local services (correct)

What is the main difference between a Metropolitan Area Network (MAN) and a Wide Area Network (WAN)?

<p>MANs connect networks in a city, while WANs connect networks across a larger area (D)</p> Signup and view all the answers

How do bridges filter network traffic?

<p>Bridges filter traffic by looking only at the MAC address.</p> Signup and view all the answers

A bridge can analyze incoming frames and forward them based on addressing information.

<p>True (A)</p> Signup and view all the answers

Which of the following is NOT an advantage of the bus topology?

<p>Very high bandwidth capacity (B)</p> Signup and view all the answers

What is the main function of a network hub?

<p>A hub connects your PCs and peripherals.</p> Signup and view all the answers

What is the purpose of a network operating system (NOS)?

<p>A network operating system is required for most PCs to provide the connections they need.</p> Signup and view all the answers

What is the main advantage of the star topology?

<p>It is easy to modify and add new computers to a star network without disturbing the rest of the network.</p> Signup and view all the answers

What is the main disadvantage of the ring topology?

<p>Failure of one computer on the ring can affect the whole network.</p> Signup and view all the answers

What is the definition of bandwidth?

<p>Bandwidth is defined as the amount of information that can flow through a network connection in a given period of time.</p> Signup and view all the answers

What is the main function of the Transport Layer in the OSI reference model?

<p>Ensures reliable and ordered delivery of data between two hosts (D)</p> Signup and view all the answers

Which of the following layers in the OSI model is responsible for addressing the communication between two systems that might be geographically separated network?

<p>Network Layer (D)</p> Signup and view all the answers

What is the main purpose of TCP/IP?

<p>TCP/IP is the basic communication language or protocol of the Internet.</p> Signup and view all the answers

What is the function of the subnet mask in IP addressing?

<p>To determine which portion of the IP address represents the network and which portion represents the host (D)</p> Signup and view all the answers

What is the main difference between a straight-through cable and a crossover cable?

<p>A crossover cable has one end with the orange set of wires switched with the green set.</p> Signup and view all the answers

Fiber-optic cable is more susceptible to electromagnetic interference compared to other networking media.

<p>False (B)</p> Signup and view all the answers

What is the main purpose of a router?

<p>A router makes decisions regarding the best path for the delivery of data on the network.</p> Signup and view all the answers

What is the function of a patch panel?

<p>Patch panels are convenient groupings of RJ-45 jacks, providing connectivity or conducting paths.</p> Signup and view all the answers

What is the purpose of the Application Layer in the OSI model?

<p>The application layer provides network services to the user's applications.</p> Signup and view all the answers

Which of these is an example of an Application Layer service?

<p>Email, file transfer, client/server (A)</p> Signup and view all the answers

What is the purpose of the Presentation Layer in the OSI model?

<p>The Presentation Layer ensures that the information that the application layer of one system send out can be read by the application layer of another system.</p> Signup and view all the answers

Which of the following is a common Layer 6 standard for data formatting?

<p>JPEG (B)</p> Signup and view all the answers

What is the main function of the Session Layer in the OSI model?

<p>The Session Layer establishes, manages, and terminates sessions between two communicating hosts.</p> Signup and view all the answers

The OSI reference model is considered a hierarchical model, with each layer building upon the services provided by the layer below it.

<p>True (A)</p> Signup and view all the answers

What is the main advantage of using a layered approach to network communication?

<p>It breaks network communication into smaller, simpler parts.</p> Signup and view all the answers

The OSI reference model is a de facto standard, meaning it is widely accepted and used by network vendors and organizations.

<p>True (A)</p> Signup and view all the answers

What is the purpose of peer-to-peer networking?

<p>Participants that make a portion of their resources directly available to other network participants without the need for central coordination instances.</p> Signup and view all the answers

Flashcards

Network

A collection of interconnected devices, such as computers, printers, and other peripherals, that share resources like data, applications, and internet connections.

Local Area Network (LAN)

A network that spans a small geographical area, typically a building or a small group of buildings.

Metropolitan Area Network (MAN)

A network that spans a larger area, such as a city or a metropolitan region, connecting multiple LANs.

Wide Area Network (WAN)

A network that spans a very large geographical area, connecting multiple LANs and MANs across countries or continents.

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Bus Topology

A network topology where devices are connected in a linear manner, with all devices sharing a single cable.

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Star Topology

A network topology where devices are connected to a central hub, with each device having a dedicated connection to the hub.

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Ring Topology

A network topology where devices are connected in a closed loop, with each device connected to its two neighbors.

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Mesh Topology

A network topology where devices are connected using multiple redundant links, creating a highly resilient and scalable network.

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Repeater

A Layer 1 device that amplifies and strengthens a signal, extending the range of a network.

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Hub

A Layer 1 device that acts as a central point for devices on a network, broadcasting data to all connected devices.

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Bridge

A Layer 2 device that learns the MAC addresses of devices on each side and forwards data packets between networks based on those addresses.

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Switch

A Layer 2 device that uses a table of MAC addresses to forward data packets to specific destinations, allowing for efficient communication between devices.

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Router

A Layer 3 device that uses IP addresses to route data packets between networks, deciding the best path for data to travel.

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Unshielded Twisted Pair (UTP)

A type of twisted-pair cable without a shield, used for connecting devices in a network.

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Shielded Twisted Pair (STP)

A type of twisted-pair cable with a shield, providing enhanced protection against interference.

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Screened Twisted Pair (SCTP)

A hybrid type of twisted-pair cable, using UTP with an additional metallic foil shield for improved protection.

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TCP/IP

A suite of protocols, including TCP and IP, used for communication on the internet and other networks.

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IP Address

A 32-bit number that uniquely identifies a device on a network.

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Subnet Mask

A number used to divide an IP address into a network portion and a host portion, allowing for efficient network management.

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Peer-to-peer Networking

A networking model where devices share resources directly without a central server, relying on peer-to-peer connections.

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OSI Reference Model

A model that breaks down complex network functions into seven distinct layers, each responsible for a specific aspect of communication.

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Physical Layer

Layer 1 of the OSI model, responsible for the physical transmission of data bits over a medium.

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Data Link Layer

Layer 2 of the OSI model, responsible for error detection and correction on the physical link.

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Network Layer

Layer 3 of the OSI model, responsible for routing data packets across networks.

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Transport Layer

Layer 4 of the OSI model, responsible for reliable and end-to-end delivery of data between applications.

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Session Layer

Layer 5 of the OSI model, responsible for managing the communication session between applications.

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Presentation Layer

Layer 6 of the OSI model, responsible for handling different data formats and ensuring data is interpreted correctly by receiving devices.

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Application Layer

Layer 7 of the OSI model, responsible for providing an interface between applications and the network.

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Study Notes

Network Topologies

  • Star Topology: Network fails if the central hub fails. Requires a device at the center to rebroadcast traffic. More cable is needed compared to other topologies.

  • Ring Topology: Each computer connects to the next, forming a ring. All computers retransmit received messages. Not susceptible to signal loss like a bus topology. Token passing is often used in ring networks. A token circulates until a device needs to send data, modifying the token to include the information and destination address.

  • Bus Topology: Heavy traffic slows the network down. Any computer can transmit at any time, without coordination. Loss of a cable or faulty device can disrupt the entire network.

  • Mesh Topology: Distinguished by redundant links between devices. Offers high tolerance to failure because of multiple paths for data transmission. Very expensive and difficult to manage.

LANs, MANs, and WANs

  • Local Area Network (LAN): Relatively small geographic area. Used for sharing files, printers, and making internal communication seamless. Connects computers in a business or building.

  • Metropolitan Area Network (MAN): Covers a larger geographic area than a LAN (e.g., a city). Connects multiple LANs within a metropolitan area.

  • Wide Area Network (WAN): Largest network topology, spans large geographic areas (e.g., across countries or continents). Used by businesses to connect offices in different locations.

Network Communication

  • How networks work: Devices communicate by transmitting information in small electrical pulses (packets). Each packet includes the source and destination addresses.

  • Protocols: Protocols (e.g., CSMA/CD) ensure efficient data transmission and prevent collisions.

Importance of Bandwidth

  • Bandwidth: The amount of data that can be transmitted through a network connection in a given period.

  • Importance: Bandwidth is crucial, as it directly impacts the speed and capacity of the network. High bandwidth enables faster transmission and processing.

Components of a Network

  • PCs and peripherals: Computers and devices like printers.

  • Network cables: Connect devices to the network.

  • Network equipment: Hubs, routers, switches, and patch panels.

  • Network operating system (NOS): Manages network resources.

Network Layers (OSI Model)

  • Layer 7 (Application): Handles user interaction, e.g., email, file transfers.

  • Layer 6 (Presentation): Formats data for different systems.

  • Layer 5 (Session): Manages sessions between applications.

  • Layer 4 (Transport): Ensures data delivery. Controls flow to guarantee the integrity of the delivery of data.

  • Layer 3 (Network): Routes data based on addresses. Determines which pathway best suits to transport data.

  • Layer 2 (Data Link): Handles transmission between devices connected to the physical network interface.

  • Layer 1 (Physical): Transmits bits as electrical signals.

Network Cable Types

  • Unshielded Twisted Pair (UTP): Common affordable cabling option. Uses twisted pairs of wires to reduce crosstalk.

  • Shielded Twisted Pair (STP): Shielded pairs of wires to reduce electromagnetic interference. More expensive than UTP.

  • Screened Twisted Pair (ScTP): Hybrid of both UTP and STP. Offers better protection against interference and electrical noise.

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Network Topologies PDF

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