LAN
Local Area Network or LAN, in computer science, a group of computers and other devices dispersed over a relatively limited area and connected by a communications link that enables any device to interact with any other on the network. LANs commonly include microcomputers and shared (often expensive) resources such as laser printers and large hard disks. Most (modern) LANs can support a wide variety of computers and other devices. Each device must use the proper physical and data-link protocols for the particular LAN, and all devices that want to communicate with each other on the LAN must use the same upper-level communications protocol. Although single LANs are geographically limited (to a department or an office building, for example), separate LANs can be connected to form larger networks. Similar LANs are linked by bridges, which act as transfer points between networks; dissimilar LANs are linked by gateways, which both transfer data and convert it according to the protocols used by the receiving network.
The devices on a LAN are known as nodes, and the nodes are connected by cabling through which messages are transmitted. Types of cables include twisted-pair wiring, coaxial cable, or fibre-optic cable. Nodes on a LAN can be wired together in any of three basic topologies, known as bus, ring, and star. As implied by their names, a bus network is more or less linear, a ring network forms a loop, and a star network radiates from a central hub.
To avoid potential collisions when two or more nodes attempt to transmit at the same time, LANs use either contention and collision detection or token passing to regulate traffic.
WAN
It is a computer network that covers a wide geographical area, usually over telephone lines, as compared to a local area network, which operates in a single company or institution. The Internet is an interconnected web of WANs.
MAN
Short for Metropolitan Area Network, a data network designed for a town or city. In terms of geographic breadth, MANs are larger than local-area networks (LANs), but smaller than wide-area networks (WANs). MANs are usually characterized by very high-speed connections using fiber optical cable or other digital media.
HAN
Short for home-area network. It is network contained within a user's home that connects a person's digital devices.
CAN
Short for campus-area network. Here, the computers are within a limited geographic area, such as a campus or military base.
VPN
Short for virtual private network, a network that is constructed by using public wires to connect nodes.
... access to what and in which sequence. The router connects the LAN to other networks, which could be the Internet or another corporate network so that the LAN can exchange information with networks external to it. The most common LAN operating systems are Windows, Linux, and Novell. Each of these network operating systems supports TCP/IP as their default networking protocol. Ethernet is the dominant LAN standard at the physical network level, specifying the physical medium to carry signals between computers, access control rules, and a standardized set of bits used to carry data over the system. Originally, Ethernet supported a data transfer rate of 10 megabits per second (Mbps). Newer versions, such as Fast Ethernet and Gigabit Ethernet, support data transfer rates of 100 Mbps and 1 gigabits per second (Gbps), respectively, and are used in network backbones.
What is the Internet? The Internet is a global computer network providing a variety of information and communications facilities, consisting of interconnected networks using standardized communcation protocols.
It is a network security measure used in computer networks to ensure that the secure network physically protected from other unprotected networks. This
It just doesn't get much simpler than the physical bus topology when it comes to connecting nodes on a Local Area Network (LAN). The most common implementation of a linear bus topology is IEEE 802.3 Ethernet. All devices in a bus topology are connected to a single cable called the bus, backbone, or ether. The transmission medium has a physical beginning and an end. All connections must be terminated with a resistor to keep data transmissions from being mistaken as network traffic. The terminating resistor must match the impedance of the cable.
A switch can be used to make various connections. Ethernet, Token Ring, and various other types of packet switched network segments together to form a heterogeneous network operating at OSI Layer 2.
A network can be based on either a peer-to-peer level or server-based, also referred to as domain-based. To distinguish the difference, a peer-to-peer network, also known as a workgroup, is a network in which a group of computers are connected together to share resources, such as files, applications, or peripherals. The computers in a peer-to-peer network are peers to one another, meaning no single computer has control over one another. There is also no central location for users to access resources, which means that each individual computer must share their files in order for other computers to have access (Muller, 2003, p.411). “In a peer-to-peer environment, access rights are governed by setting sharing permissions on individual machines.” (Cope, 2002) On the other hand, in a domain-based network, the computers connected together are either servers or clients. All of the other computers connected to the network are called client computers. The server is a dedicated machine that acts as a central location for users to share and access resources. The server controls the level of authority each user has to the shared resources. When logging on to the network, users on client machines are authenticated by the server, based on a user name and password (Lowe, 2004, p.13).
The definition of the Internet put in one sentence is: A worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange, where anyone with a computer can access the internet through an ISP (Internet Service Provider).
Mesh networks are reliable, stable, and redundant. If a node can no longer operate, all the others are not affected as they can still communicate either directly or through one or more intermediate nodes. Mesh networks can be very expensive due to the large amount of cable and connections required. Bus Topology Bus topology refers to a local area network (LAN) arrangement where each node or device is connected to a main cable or link called a bus. The bus network is simple yet very reliable.
Local Area Networks also called LANs have been a major player in industrialization of computers. In the past 20 or so years the worlds industry has be invaded with new computer technology. It has made such an impact on the way we do business that it has become essential with an ever-growing need for improvement. LANs give an employer the ability to share information between computers with a simple relatively inexpensive system of network cards and software. It also lets the user or users share hardware such as Printers and scanners. The speed of access between the computers is lighting fast because the data has a short distance to cover. In most cases a LAN only occupies one or a group of buildings located next to each other. For larger area need there are several other types of networks such as the Internet.
Having grown up in a lower middle-class neighborhood myself, I have witnessed the challenges many students in these communities experience first-hand. I was lucky enough to attend a school with more resources, but many of my neighbors didn’t receive the same opportunity and struggled to keep up in school. For example, one of my neighbors didn’t have a car after his parents divorced and would miss school if he missed the bus. Other neighbors didn’t have access to computers or had to take care of their siblings while their parents worked, making it difficult for them to do homework. Knowing these children increased my awareness of how situations at home and financial struggles can affect a student’s education.
The Internet is a network of networks, linking computers to computers sharing the TCP/IP protocols. Each runs software to provide or "serve" information and/or to access and view information. The Internet is the transport vehicle for the information stored in files or documents on another computer. It can be compared to an international communications utility servicing computers. It is sometimes compared to a giant international plumbing system.
The Internet is one of the greatest inventions of humanity. It is a massive network of computers, each with the ability to access any of the others. Ungodly amounts of information can be found on the Internet. It is the ultimate form of media, a combination of newspaper, radio, and as the average bandwidth is increasing, television. Using
We live in a world where the internet lays a pinnacle role in our day to day lives. The internet is used globally and can impact the world in many ways. Firstly, what is internet? Well internet is a computer network which globally providing a wide range of information and communication services.
The internet is a total of mediums which are connected between them with channels of communication. The internet is actually an internet after it connects to smaller networks of many countries. The internet rouses the computer and the world of the communications like nothing else before. The invention of the computer, of the telephone, of the telegraph etc, set the stage for this unprecedented completion of faculties. The internet becomes right away a world capable radio broadcast, a mechanism for the distribution of information and a means for the cooperation and the interaction between the individuals and their computers, being indifferent to the geographic place.
Exploring The Internet The Internet is like a network of networks where any computer can link up to information stored within it. It is accessed by a telecommunications line and a modulator-demodulator (MODEM). It is brought to your computer screen by converting analogue telephone signals into digital computer signals. There are many advantages and disadvantages on the Internet.