Computer Networks Overview
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Questions and Answers

What is the primary purpose of symmetric-key encryption?

  • To use different keys for encryption and decryption
  • To use the same key for both encryption and decryption (correct)
  • To allow multiple users to decrypt the same message
  • To enhance data transmission speed

    • What is the main purpose of an intranet?

  • To connect millions of computer systems globally
  • To provide extensive services such as email and file transfer
  • To allow remote access to a private network for external users
  • To facilitate communication and improve data sharing within a specific organization (correct)

    • What should you do to secure your wireless network upon setup?

  • Leave all security features enabled by default
  • Use a firewall on devices only
  • Create an open network for neighbors
  • Enable security features on the router or access point (correct)

    • What characterizes a Virtual Private Network (VPN)?

    <p>It connects multiple computer systems as if they were in a local network. (B)</p> Signup and view all the answers

    Which statement best describes the Internet of Things (IoT)?

    <p>It involves individual devices that can communicate and exchange data via the Internet. (D)</p> Signup and view all the answers

    Which of the following is a method to enhance network security?

    <p>Blocking access to wireless devices by MAC address (B)</p> Signup and view all the answers

    Which security feature is commonly associated with wireless routers?

    <p>WEP Wireless security (A)</p> Signup and view all the answers

    What defines an extranet?

    <p>A network that allows controlled access to specific users over the Internet. (D)</p> Signup and view all the answers

    How does a peer-to-peer (P2P) network function?

    <p>All systems in the network are both clients and servers, sharing resources directly. (C)</p> Signup and view all the answers

    What is a function of a router hardware firewall?

    <p>To protect your connection and block unwanted traffic (A)</p> Signup and view all the answers

    What is a defining feature of a Personal Area Network (PAN)?

    <p>It centers around an individual’s workspace and typically uses Bluetooth technology. (B)</p> Signup and view all the answers

    What method does NOT enhance the security of a wireless network?

    <p>Using a weak password for access (A)</p> Signup and view all the answers

    What aspect distinguishes the Internet from intranets and extranets?

    <p>The Internet is a decentralized global network connecting millions of systems. (C)</p> Signup and view all the answers

    What is the purpose of a PIN in network security?

    <p>To authenticate devices connecting to the network (D)</p> Signup and view all the answers

    In wireless networking, how do devices typically communicate?

    <p>Using radio transmissions without physical connections. (A)</p> Signup and view all the answers

    Which method can be used to prevent physical access to a network?

    <p>Shielding the building from electromagnetic interference (B)</p> Signup and view all the answers

    What is the primary function of a server in a computer network?

    <p>To provide services to clients (A)</p> Signup and view all the answers

    Which network device can identify which device is connected to which port?

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

    What is typically a characteristic of a LAN?

    <p>Allows for high data transfer rates (C)</p> Signup and view all the answers

    What distinguishes a WLAN from a LAN?

    <p>WLAN allows for mobile devices to connect wirelessly (D)</p> Signup and view all the answers

    Which type of network uses logical partitioning to separate departments?

    <p>VLAN (C)</p> Signup and view all the answers

    What is an example of a WAN?

    <p>The Internet (C)</p> Signup and view all the answers

    Which device serves as an intermediary between multiple networks?

    <p>Router (C)</p> Signup and view all the answers

    What is a primary purpose of a Storage Area Network (SAN)?

    <p>To provide easy access to large storage devices for servers (B)</p> Signup and view all the answers

    Which of the following describes the function of a hub in a network?

    <p>Acts only as the central connection point for devices (C)</p> Signup and view all the answers

    What differentiates a client from a server in a network?

    <p>Clients request services from servers (C)</p> Signup and view all the answers

    Which of the following is NOT a potential health concern associated with extensive use of mobile devices and wireless networks?

    <p>Improved sleep quality (B)</p> Signup and view all the answers

    What is the primary purpose of a "Wireless Network Adapter" in a wireless network?

    <p>To enable devices to communicate wirelessly with the network (B)</p> Signup and view all the answers

    Which of the following software components helps a server automatically assign an IP address to a client device?

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

    Which of the following is NOT considered a hardware device associated with a wireless network?

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

    Which of the following best describes the purpose of a "Wireless Repeater" in a wireless network?

    <p>To amplify and extend the range of the wireless signal (A)</p> Signup and view all the answers

    Which of the following options is a potential disadvantage of using mobile devices and wireless networks?

    <p>Social isolation and reduced face-to-face interaction (B)</p> Signup and view all the answers

    Which of the following is NOT considered a type of security software used to protect a network?

    <p>Web browser (C)</p> Signup and view all the answers

    What is the primary function of a software firewall in a network?

    <p>To detect and prevent unauthorized or malicious access to the network (C)</p> Signup and view all the answers

    What is the primary characteristic of Wi-Fi that makes it suitable for home use?

    <p>It has a small transmitting radius, usually less than 20m. (C)</p> Signup and view all the answers

    Which generation of mobile telecommunication technology introduced features like video calls and mobile TV?

    <p>3G (B)</p> Signup and view all the answers

    What is a key feature of 4G technology regarding communication?

    <p>It prioritizes IP-based communication. (B)</p> Signup and view all the answers

    Which characteristic differentiates 5G from previous generations?

    <p>5G is also known as the Tactile Internet. (C)</p> Signup and view all the answers

    What does WiMAX provide that distinguishes it from traditional Wi-Fi networks?

    <p>Connectivity in remote and isolated areas. (B)</p> Signup and view all the answers

    What is one of the major vulnerabilities of wireless networks compared to wired networks?

    <p>They are more susceptible to unauthorized access. (C)</p> Signup and view all the answers

    What role does encryption serve in wireless network security?

    <p>Protects data from unauthorized access. (C)</p> Signup and view all the answers

    Which feature is NOT true regarding 4G LTE technology?

    <p>It includes support for traditional circuit telephony services. (C)</p> Signup and view all the answers

    Which of the following is a feature of wireless sensor networks?

    <p>They measure data for environmental or physical parameters. (A)</p> Signup and view all the answers

    In which scenario would Wi-Fi not be the preferred network type?

    <p>In isolated regions needing internet access. (C)</p> Signup and view all the answers

    Flashcards

    Intranet

    A private network using standard protocols for communication within an organization.

    Internet

    A global WAN connecting millions of computers providing various services.

    Internet of Things (IoT)

    A network of devices that connect to the Internet and communicate data.

    Extranet

    A network allowing controlled Internet access to specific users for a LAN.

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    VPN

    A network connecting remote clients as if they were within a LAN.

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    PAN

    A network connecting devices around an individual, often using Bluetooth.

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    Peer-to-Peer (P2P)

    A decentralized network where all computers act as both clients and servers.

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    Wireless Networking

    Communication between devices through radio transmissions without physical connections.

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    Radiofrequency fields

    Waves emitted by mobile devices that can cause tissue heating.

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    Dynamic Host Configuration Protocol (DHCP)

    Protocol that automatically assigns IP addresses to client devices.

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    Wireless Access Point (WAP)

    Device that connects wireless devices to a network.

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    Mobile device health concerns

    Issues like brain tumors and hypersensitivity due to extensive device use.

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    Wireless network adapter (NIC)

    Device needed for each device to connect to a wireless network.

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    Software firewall

    System that regulates data flow in and out of a network or PC.

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    Node

    Any device that connects to the Internet, like PCs or tablets.

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    Ethernet over power line

    Uses electrical wires to transmit Ethernet signals to wireless devices.

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    Computer Network

    A group of connected computer systems that can communicate and exchange data.

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    Server

    A computer system or software that provides services to other computers on a network.

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    Client

    A computer system or software that requests services from a server.

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    Hub

    A device that connects multiple computers on a single network using ports.

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    Switch

    A networking device that connects devices on a local area network and directs data to the appropriate device.

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    Router

    A device that connects multiple networks and facilitates data exchange between them.

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    Symmetric-key encryption

    A method of encryption where the same key is used for both encryption and decryption.

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    Public-key encryption

    An encryption method that uses a public key for encryption and a private key for decryption.

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    Wireless Access Security

    The security measures applied when setting up a wireless network to prevent unauthorized access.

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    WEP

    Wired Equivalent Privacy, an older wireless security protocol that is now considered insecure.

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    WPA/WPA2

    Wi-Fi Protected Access; stronger wireless security protocols compared to WEP.

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    MAC address blocking

    A method to restrict access to a wireless network by allowing or denying specific devices based on their MAC addresses.

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    WPS (Wireless Protected Setup)

    A network security standard that allows users to easily secure a wireless home network.

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    Encryption software

    Software used to encode sensitive information before sending it over the Internet to secure it from unauthorized access.

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    Wi-Fi

    A wireless network technology used for connecting devices to the internet.

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    1G

    The first generation of mobile technology that utilized analog transmission.

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    3G

    Third generation mobile networking, supporting faster data and features like GPS and video calls.

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    4G

    Fourth generation mobile technology with high-speed internet access up to 1 Gbit/s.

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    5G

    Fifth generation mobile network known for very high speeds and low latency.

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    LTE

    Long Term Evolution; a standard for high-speed wireless communication.

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    WiMax

    Worldwide Interoperability for Microwave Access, providing high-speed internet over large distances.

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    Wireless Sensor Network

    A network of sensors linked wirelessly to monitor environments or physical conditions.

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    Encryption

    A method to protect data by converting it into a secure format during transmission.

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    Network Vulnerability

    The susceptibility of networks to unauthorized access or attacks.

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    Study Notes

    Computer Networks

    • A computer network is comprised of two or more computer systems that are connected and able to communicate and exchange data.
    • This connection can be wired or wireless.

    Server

    • A server can be a computer system or software application.
    • It provides services to other connected computer systems on the network.
    • It can manage file storage and sharing.

    Client

    • A client can be a computer system or software application.
    • It requests a service from a server.
    • It's part of the same network as the server.

    Hub

    • A hub does not share its own resources.
    • It receives requests from other computers and forwards them to the appropriate computer network component.
    • It's a fundamental component in constructing a computer network.

    Switch

    • A switch connects devices on a single network.
    • It determines the device connected to each port.
    • Data is transmitted to the exact port and network device, avoiding sending data to other devices.

    Router

    • A router is more sophisticated than both hubs and switches.
    • It connects multiple networks.
    • It facilitates efficient data exchange between network devices from different networks.

    Types of Networks

    LAN (Local Area Network)

    • Connects computer systems within a limited geographical area (e.g., a room, home, office).
    • Has high data transfer rates between connected computer systems.
    • Allows sharing of peripheral devices.
    • Eliminates the need to have separate devices for each computer.
    • Wired LANs use Ethernet cabling. LANs can be wired or wireless.

    WAN (Wide Area Network)

    • Connects computer systems spread over a large geographical area (e.g., the internet).
    • Allows individuals, businesses, and governments to conduct their daily activities regardless of location.

    WLAN (Wireless LAN)

    • Similar to LAN but uses a wireless connection method, allowing mobile devices and laptops to be connected as they move around.
    • Common method is Wi-Fi.
    • Often less secure than wired networks.

    Client-Server Mode

    • A single computer system acts as a server.
    • The server provides services to clients on the network.

    VLAN (Virtual LAN)

    • Allows partitioning of a LAN into logical separate networks.
    • More secure than a basic LAN.

    SAN (Storage Area Network)

    • Designed for efficient storage management.
    • Connects storage devices (like large hard drives) to server systems.

    Intranet

    • A group of private computer networks used within a specific organization (e.g., company, school).
    • Used for facilitating communication and sharing data within the organization.

    Internet

    • A global WAN connecting many computer systems.
    • Provides various services like the World Wide Web (WWW), email, and file transfer.
    • It's decentralized in design.
    • Internet of Things (IoT) uses devices that connect to the internet and have the capacity to communicate and exchange data.

    Extranet

    • A network that utilizes the internet to provide controlled access to specific users.

    VPN

    • Virtual Private Network.
    • Allows remote users to connect to the network.

    PAN (Personal Area Network)

    • Used for connecting devices in a personal workspace (e.g., Bluetooth).

    Peer-to-Peer (P2P)

    • A network model where every device acts as both a client and server.
    • Resources are distributed among the devices.

    Wireless Networking

    • All wireless devices communicate through radio transmissions.
    • Examples include cell phones, cordless keyboards, local area networks (LANs).

    Advantages and Disadvantages of Wireless Networks

    • Advantages include ease of set up, flexibility, and convenience.
    • Disadvantages include susceptibility to interference, potential security risks, and variability in speed compared to wired networks.

    Health Concerns

    • Excessive use of mobile devices and wireless networks can lead to health issues (e.g., tissue heating, brain tumors).
    • These networks use radiofrequency fields which require consideration.

    Hardware Needed for Wireless Networking

    • Modem: Allows connection to the internet.
    • Wireless Network Adapter (NIC): An adapter for each device that is connected to a wireless network.

    Software Needed for Wireless Networking

    • Dynamic Host Configuration Protocol (DHCP): Automatically assigns IP addresses.
    • Service Set Identifier (SSID): Used to differentiate one WLAN from another.

    Security

    • Security software: Protects from unauthorized access using various methods, like access controls, firewalls, and antivirus, anti-malware etc.

    Wireless Access Protocols

    • WAP (Wireless Application Protocol): Used to access information over mobile wireless networks.
    • Wi-Fi: Often used for small-scale networks.

    Generations of Wireless Communication

    • 1G: Uses analog transmission.
    • 2G: More secure than 1G and offers more digital data.
    • 3G: Offers better data transfer rates and includes video calls and mobile TV.
    • 4G (including LTE): Provides high-speed data transfer for use with cars, buses etc.
    • 5G: Supports high-speed, high-capacity communication requirements and is an evolving technology.

    Network Protocols

    • Protocols govern how computers connect to each other, enabling information to be exchanged and processed efficiently.

    Specific Protocols Mentioned (from the document)

    • WiMax
    • Ethernet
    • DHCP

    Security Methods for Wireless Networks

    • Passwords: Essential for secure access.
    • Antivirus: Essential protection for all systems.
    • Firewall software: To control network access.

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