Chapter 1: Computer Network Practice Flashcards

Learning Objectives of Computer Networks

The study of computer networks encompasses several critical milestones for understanding how data is transmitted and managed across digital landscapes. These objectives include:

  • Explaining the fundamental definition of a computer network.

  • Understanding the specific processes involved in the creation of a computer network.

  • Identifying and detailing the key elements required for data communication.

  • Recognizing the functional importance of networks in modern infrastructure.

  • Categorizing networking media into wired and wireless types.

  • Differentiating between various network classifications based on geographical scale.

  • Explaining different network topologies and their structures.

  • Identifying various networking devices, including switches, routers, and hubs.

  • Understanding the essential role that protocols play in facilitating communication.

  • Identifying cybersecurity threats and establishing network safety practices.

Fundamentals of Computer Networking and Topology

Definition of Network Topology

  • Network topology refers to the specific physical or logical arrangement in which computers and other devices are interconnected within a network.

  • It serves as the definitive structure of the network, determining the exact path and method by which data flows between different interconnected parts.

Fundamental Network Types: LAN vs. WAN

Networks are often classified by the geographical area they cover:

  • Local Area Network (LAN):

    • Scope: Connects computers and peripheral devices within a limited, small geographical area such as a private home, a classroom, or a single office.

    • Purpose: Its primary function is to allow users to share localized resources, including files, printers, and shared Internet connections.

  • Wide Area Network (WAN):

    • Scope: Connects multiple networks across vast distances, spanning from one city to another, or even between different countries.

    • Scale: It is considered the largest type of network and serves as the backbone for global communication.

Communication Protocols

  • Definition: A network protocol is a standardized set of rules and conventions that devices must follow to communicate and share information with one another successfully.

  • Example: The Transmission Control Protocol/Internet Protocol (TCP/IPTCP/IP) is a primary example of a protocol used for network communications.

Analysis of Network Topologies

Star Topology

  • Advantages:

    • Cost Efficiency: This topology is characterized by having minimal line costs.

    • Fault Tolerance: If a local computer (node) fails, the remaining portion of the network remains operational and unaffected.

  • Disadvantages:

    • Central Dependency: The entire system is dependent on a central switch. If this central device fails, the entire network becomes non-functional (goes down).

Mesh Topology

  • Advantages:

    • Reliability: The failure of a single node does not impact the rest of the network.

    • Speed: Communication between any two nodes is very fast due to the nature of the connections.

    • Scalability and Maintenance: Changes can be made to the network easily without causing interruptions to other active nodes.

  • Disadvantages:

    • High Cost: It is categorized as the most expensive network type because it requires many redundant connections.

    • Complexity: The maintenance requirements for this network type are very difficult due to the high density of connections.

Hardware Components for Network Establishment

To successfully establish a network, several hardware components are required, each serving a specific role:

  • File Server: A dedicated computer that acts as a central hub to distribute or "serve" application programs and data files to various workstations.

  • Network Printer: A printer that is typically attached to the file server, allowing it to be shared by all users on the network.

  • Workstation: This refers to the individual computer used by a person on the network. It is the end-user interface that connects to other devices.

  • Communication Channel/Cables: The physical or logical medium, such as a cable, that interconnects computers and devices to allow data transmission.

Networking Devices and Data Routing

Routers

  • Role: A router is a specialized communication device designed to connect two distinct networks, such as two separate LANs.

  • Functionality: Its primary job is to forward data packets from the source machine to the destination machine.

  • Path Optimization: It manages network traffic by determining and using the shortest possible path for data delivery.

Networking Media: Wired vs. Wireless

Wired Media

  • Description: Wired media utilizes physical cables to establish connections between computers and devices.

  • Performance: The specific type of cable utilized directly impacts the speed at which data travels through the network.

  • Scale: Depending on the network's requirements, some may only need a few cables for short distances, while others require extensive cabling over very long distances.

  • Examples:

    • Twisted Pair Cable.

    • Coaxial Cable.

    • Optical Fibre Cable.

Wireless Media (Unguided Media)

  • Description: Wireless media does not rely on physical cables. Instead, data is transmitted through the air using electromagnetic signals.

  • Function: This media allows for communication without the constraints of physical wires.

  • Alternative Name: Often referred to as "unguided media."

  • Examples:

    • Bluetooth.

    • Infrared.

    • Wi-Fi (Wireless Fidelity).