Networks Overview

Study Notes

Networks

Networks are essential for communication between computers, devices, and systems. They allow sharing of information, resources, and access to services. There are several types of networks based on their size, complexity, and geographical coverage.

Local Area Networks (LAN)

A local area network is a computer network that interconnects computers within a limited area such as a room, school, laboratory, office building, university campus, or metropolitan area. LANs may be further divided into two categories: wired LANs, with cables connecting each node (computer, printer), and wireless LANs using WiFi technology.

Wide Area Networks (WAN)

A wide area network is a computer network that covers a large geographic area, such as a country, continent, or even globally. Unlike LANs, which have all nodes connected directly by cables, WANs rely on leased lines from telephone companies, satellites, cell towers, fiber optic, and other technologies.

Metropolitan Area Networks (MAN)

A metropolitan area network is a type of computer network that connects users with computer resources in a geographic area or region larger than that covered by a local-area network (LAN) but smaller than the area covered by a wide-area network (WAN). MANs often serve cities and small regions.

Internetwork

An internetwork is a network formed when multiple networks are linked together. This allows separate computer systems to communicate through the shared network infrastructure. An example of this is the public Internet, where millions of computers worldwide are connected and can share data across vast distances.

Virtual Private Networks (VPN)

A virtual private network extends a private network across a public network, enabling secure connections between remote users and devices over the Internet. VPNs are widely used by businesses and individuals to protect sensitive data and maintain privacy while browsing online.

Peer-to-Peer Networks (P2P)

A peer-to-peer network is a distributed network architecture that partitions tasks or workloads among peers. Peers are equally privileged, equipped with the same network functionality. Each computer has a client and a server function, allowing it to request and provide services to other networked computers.

Wireless Networks

Wireless networks rely on wireless communication to provide network access without the need for physical connection to network infrastructure. They include WiFi, cellular, satellite, and Bluetooth networks. Wireless networks are convenient for mobile devices and are often used in public places like coffee shops and airports.

Network Topologies

Network topology refers to the arrangement of a network's connections. Common topologies include bus topology, star topology, ring topology, mesh topology, and tree topology. Each topology has its advantages and disadvantages, and the choice of topology depends on the specific needs of the network.

Network Protocols

Network protocols are a set of rules that govern the format and transmission of data over a network. Examples include TCP/IP, HTTP, FTP, and SMTP. These protocols ensure that data is transmitted and received correctly and efficiently.

Network Security

Network security involves protecting networks and data from unauthorized access, use, disclosure, disruption, modification, or destruction. Network security measures include firewalls, intrusion detection systems, antivirus software, and access control.

Cloud Networks

A cloud network refers to a network infrastructure that provides services over the Internet. Cloud networks allow users to access resources and services from anywhere, anytime, and on any device with an Internet connection. Examples of cloud networks include Amazon Web Services, Microsoft Azure, and Google Cloud.

Network Hardware

Network hardware refers to the physical devices used to create and maintain computer networks. These include routers, switches, hubs, modems, and firewalls. Network hardware enables the communication and exchange of data between devices connected in a network.

Network Software

Network software refers to the programs and applications used to manage and operate computer networks. Examples of network software include network management software, network security software, and network analysis software. Network software enables network administrators to monitor, control, and optimize network performance and security.

In conclusion, networks play a crucial role in connecting devices, sharing resources, and facilitating communication. Understanding the various types of networks, their topologies, protocols, and security measures is essential for effective network management and utilization.

Description

Explore the fundamentals of computer networks, including Local Area Networks (LAN), Wide Area Networks (WAN), Metropolitan Area Networks (MAN), Internetworks, Virtual Private Networks (VPN), and more. Learn about network topologies, protocols, security measures, cloud networks, as well as network hardware and software.

Networks Overview

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Questions and Answers

What is a virtual private network (VPN) used for?

Which type of network architecture allows each computer to function as both a client and a server?

What do wireless networks rely on to provide network access?

Which cloud service allows users to access resources and services from anywhere with an Internet connection?

What do network topologies refer to?

Which set of rules govern the format and transmission of data over a network?

What type of network interconnects computers within a limited area such as a room or office building?

Which technology is commonly used to connect nodes in a wireless LAN?

What type of network covers a large geographic area such as a country or continent?

Which network type connects users with computer resources in a geographic area larger than a LAN but smaller than a WAN?

What is formed when multiple networks are linked together, allowing separate computer systems to communicate through a shared infrastructure?

Which type of LAN uses physical cables to connect nodes like computers and printers?