Sumber: https://widuri.raharja.info/index.php?title=Local_Area_Network_(LAN)
Local Area Network
Local Area Network commonly abbreviated as LAN is a computer network whose network only covers a small area; such as campus computer networks, buildings, offices, in homes, schools or smaller ones. Currently, most LANs based on IEEE 802.3 Ethernet technology use switch devices, which have data transfer rates of 10, 100, or 1000 Mbit/s. In addition to Ethernet technology, currently 802.11b technology (or so-called Wi-fi) is also often used to form LANs. Places that provide a LAN connection with Wi-fi technology are usually called hotspots.
In a LAN, each node or computer has its own computing power, in contrast to the concept of a terminal dump. Each computer can also access the resources on the LAN according to the permissions that have been set. These resources can be data or devices such as printers. On a LAN, a user can also communicate with other users using the appropriate application.
In contrast to the Wide Area Network (WAN), the LAN has the following characteristics:
1. Has a higher data rate 2. Covers a narrower geographic area 3. Does not require telecommunications lines leased from telecommunications operators
Usually one of the computers in the computer network will be used as a server that manages all systems on the network.
WAN
WAN is an abbreviation of the term information technology in English: Wide Area Network is a computer network that covers a large area, for example, a computer network between regions, cities or even countries, or can also be defined as a computer network that requires routers and public communication channels.
WAN is used to connect one local network to another local network, so that users or computers in one location can communicate with users and computers in other locations.
MAN
Metropolitan area network or abbreviated as MAN. A network in a city with high-speed data transfer, which connects various locations such as campuses, offices, government, and so on. A MAN network is a combination of several LANs. The range of this MAN is between 10 to 50 km, this MAN is the right network for the Metropolitan area network or abbreviated as MAN. A network in a city with high-speed data transfer, which connects various locations such as campuses, offices, government, and so on. A MAN network is a combination of several LANs. The range of this MAN is between 10 to 50 km, this MAN is the right network to build a network between offices in one city between factories/agencies and head offices that are within its reach. INTRANET An intranet is a computer network based on TCP / IP protocols such as the internet, only used in internal companies, offices, and even internet cafes (WARNET) can be categorized as Intranet. Between Intranets can communicate with each other through an Internet connection that provides the backbone for long distance communication. However, an Intranet does not need an external connection to the Internet to function properly. The intranet uses all TCP/IP protocols (TCP/IP protocols, IP addresses, and other protocols), clients as well as servers. The HTTP protocol and several other Internet protocols (FTP, POP3, or SMTP) are commonly used protocol components. an intranet can be understood as a “private version of the Internet network”, or as a version of the Internet owned by an organization.
If a business entity / business / institution exposes part of its internal network to the outside community, it is called an extranet. Indeed, usually not all intranet contents are released to the public to turn the intranet into an extranet. For example, we are buying software, books, etc. from an e-store, so we can usually access part of the Intranet of the store. Business entities / companies can block access to their intranet through routers and put firewalls. Firewall is a software / hardware that regulates someone’s access to the intranet. Protection is done through various network parameters whether it is IP address, port number etc. If the firewall is activated then access can be controlled so that we can only access part of the company’s Intranet which is then known as an extranet.
Uses of intranet
Basically the application software used on the Intranet is not much different from that used on the Internet. In the Intranet used Web, e-mail etc. exactly as used on the Intranet. WARNET is actually a very simple intranet, incidentally there is no special / specific content that is internal in the cafe.
The web with the database tools behind it, is usually the most potential tool to do 2 main things, namely:
1. Making companies/institutions more efficient, the approach taken here is usually to create a Web-based & database-based management information system. Quite a lot of people in Indonesia seem to understand this MIS problem. If the company’s MIS/ERP is well laid out the next step usually leads to e-commerce (trading over the Internet). It should be noted that you should not go too far into e-commerce if the company’s MIS / ERP backoffice system is not ready, because it will be very flawed.
2. Make companies/institutions more competitive in the world. Even if it may become a leader in the business. Making an agency competitive is only possible if we can properly manage the human resources & knowledge resources that exist within the agency/company internally. The science / concept related to this is the concept of knowledge management. The basis is how we accelerate the recycling process, analysis, synthesis of knowledge, both implicit and explicit. It is still rare for experts in Indonesia to master the technique, in fact the best in the process of mastering this technique are the librarians. Understanding the Internet The internet can be interpreted as a wide and large global computer network, which connects computer users from one country to another around the world, in which there are various information resources ranging from static to dynamic and interactive.
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