Networking Unit : Connecting Computing Devices

7.1 Describe computer networks and their pros and cons.

1. Understanding Networks

A computer network is a system where multiple devices (computers, peripherals, and network devices) are connected to share resources and information.

• Node: Any device connected to the network (computer, printer, router, etc.).

• Computer: A primary device that processes and exchanges data in a network.

• Peripheral: External devices like printers and scanners that connect to a computer.

• Network Device: Equipment like routers, switches, and modems that help manage and facilitate communication in a network.

2. Benefits & Disadvantages of Networks

✅ Benefits:

• Sharing a high-speed Internet connection among multiple users.

• Sharing printers and peripheral devices instead of having separate ones for each computer.

• Sharing files easily among connected devices.

• Common communication platforms for collaboration, such as email and messaging apps.

❌ Disadvantage:

• Setup and administration can be complex, requiring technical knowledge and maintenance.

3. How Data Moves Through Networks

• Data Transfer Rate (Bandwidth): The maximum speed at which data can be transmitted across a network.

• Throughput: The actual speed at which data is transferred, which can be affected by network traffic, hardware limitations, and interference.

• Measured in:

  • Megabits per second (Mbps) – Suitable for most home and small business networks.

  • Gigabits per second (Gbps) – Used for high-speed enterprise and data center networks.

7.2 Explain the different ways networks are defined.

1. Network Classification by Distance

Networks are categorized based on how far they extend:

• Personal Area Network (PAN): Smallest network (e.g., Bluetooth connections, smartwatch syncing).

• Local Area Network (LAN): Covers a small area like a home, office, or school (e.g., Wi-Fi in a building).

• Home Area Network (HAN): A type of LAN specific to homes, connecting smart devices, computers, and printers.

• Metropolitan Area Network (MAN): Covers a city or large campus (e.g., city-wide Wi-Fi).

• Wide Area Network (WAN): Spans large distances (e.g., the internet, a corporate network connecting multiple branches).

2. Network Classification by Administration

Networks are managed based on how devices communicate:

• Client/Server Network: A central server manages resources and clients request services (e.g., business networks).

• Peer-to-Peer (P2P) Network: Devices communicate directly without a central server (e.g., home networks, torrent sharing).

3. Network Classification by Protocols

Protocols define how devices communicate:

• Wired Networks (Ethernet):

  • Developed by the Institute of Electrical and Electronics Engineers (IEEE).

  • Uses cables for high-speed connections (e.g., Gigabit Ethernet [GbE]).

  • Backward compatibility allows older devices to work with newer Ethernet standards.

• Wireless Networks (Wi-Fi):

  • Wi-Fi 6: Latest standard, offering faster speeds and better performance in crowded networks.

  • WiGig: A high-speed wireless standard for short distances.

7.3 Describe the types of transmission media used in networks.

Transmission Media (Objective 7.3)

Transmission media create a communication channel between network nodes. They can be categorized as wired or wireless networks.

1. Wired Networks

Use physical cables to transfer data:

• Unshielded Twisted Pair (UTP) Cable:

  • Made of twisted copper wires enclosed in a plastic jacket.

  • Commonly used in Ethernet cables (e.g., Cat5e, Cat6).

  • Pros: Cost-effective, widely used.

  • Cons: Can suffer from electromagnetic interference.

• Coaxial Cable:

  • Contains a single copper wire surrounded by insulating plastic and metal shielding.

  • Used for cable TV and older network connections.

  • Pros: More resistant to interference than UTP.

  • Cons: Less commonly used for modern networking.

• Fiber-Optic Cable:

  • Made of glass or plastic fibers that transmit data as light pulses.

  • Used for high-speed internet and long-distance communication.

  • Pros: Extremely fast, immune to electrical interference, secure.

  • Cons: Expensive, requires specialized installation.

2. Wireless Networks

• Use radio waves instead of physical cables.

• Examples: Wi-Fi, Bluetooth, cellular networks (4G, 5G).

• Pros: Convenient, supports mobile devices.

• Cons: Can be affected by interference, security risks.

7.4 Describe the basic hardware devices necessary for networks.

Basic Network Hardware (Objective 7.4)

Networking hardware enables devices to connect and communicate within a network.

• Network Adapter: A device that allows a computer to connect to a network (wired or wireless).

• Network Interface Card (NIC): A hardware component (built-in or external) that provides network connectivity. Modern computers have NICs for both Ethernet and Wi-Fi.

• Modem: Converts digital data from a computer into signals for transmission over a telephone or cable line. Used to connect to the internet.

• Router: Directs network traffic between different devices and connects networks to the internet. Often combines a modem, switch, and wireless access point.

• Switch: A device that connects multiple devices within a local network (LAN) and efficiently directs data to its intended recipient.

7.5 Describe the type of software necessary for networks.

Network Software (Objective 7.5)

Network software enables devices to communicate and manage network functions.

• Operating System for Peer-to-Peer (P2P) Networking:

  • Example: Windows, macOS, and Linux support P2P networking where devices share resources without a central server.

  • Used in: Home and small office networks.

• Client/Server Network:

  • Devices communicate through a centralized server that manages network resources.

  • Requires Specialized Network Operating System (NOS) software like Windows Server, Linux Ubuntu Server, or macOS Server.

  • Used in: Businesses, data centers, large organizations.

7.6 Summarize the broadband options available to access the Internet.