Two or more computers connected close together in a local area is called

A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

Inhaltsverzeichnis Show

Local Area Network
Wide Area Network
Advantages of Installing a School Network
Disadvantages of PAN
Disadvantages of WAN
Disadvantages of MAN
2) Storage-Area Network (SAN)
3) System-Area Network
4) Passive Optical Local Area Network
5) Home Area Network (HAN):
6) Enterprise Private Network :
7) Campus Area Network (CAN):
8) Virtual Private Network:

Two very common types of networks include:

Local Area Network (LAN)
Wide Area Network (WAN)

You may also see references to a Metropolitan Area Networks (MAN), a Wireless LAN (WLAN), or a Wireless WAN (WWAN).

Local Area Network

A Local Area Network (LAN) is a network that is confined to a relatively small area. It is generally limited to a geographic area such as a writing lab, school, or building.

Computers connected to a network are broadly categorized as servers or workstations. Servers are generally not used by humans directly, but rather run continuously to provide "services" to the other computers (and their human users) on the network. Services provided can include printing and faxing, software hosting, file storage and sharing, messaging, data storage and retrieval, complete access control (security) for the network's resources, and many others.

Workstations are called such because they typically do have a human user which interacts with the network through them. Workstations were traditionally considered a desktop, consisting of a computer, keyboard, display, and mouse, or a laptop, with with integrated keyboard, display, and touchpad. With the advent of the tablet computer, and the touch screen devices such as iPad and iPhone, our definition of workstation is quickly evolving to include those devices, because of their ability to interact with the network and utilize network services.

Servers tend to be more powerful than workstations, although configurations are guided by needs. For example, a group of servers might be located in a secure area, away from humans, and only accessed through the network. In such cases, it would be common for the servers to operate without a dedicated display or keyboard. However, the size and speed of the server's processor(s), hard drive, and main memory might add dramatically to the cost of the system. On the other hand, a workstation might not need as much storage or working memory, but might require an expensive display to accommodate the needs of its user. Every computer on a network should be appropriately configured for its use.

On a single LAN, computers and servers may be connected by cables or wirelessly. Wireless access to a wired network is made possible by wireless access points (WAPs). These WAP devices provide a bridge between computers and networks. A typical WAP might have the theoretical capacity to connect hundreds or even thousands of wireless users to a network, although practical capacity might be far less.

Nearly always servers will be connected by cables to the network, because the cable connections remain the fastest. Workstations which are stationary (desktops) are also usually connected by a cable to the network, although the cost of wireless adapters has dropped to the point that, when installing workstations in an existing facility with inadequate wiring, it can be easier and less expensive to use wireless for a desktop.

See the Topology, Cabling, and Hardware sections of this tutorial for more information on the configuration of a LAN.

Wide Area Network

Wide Area Networks (WANs) connect networks in larger geographic areas, such as Florida, the United States, or the world. Dedicated transoceanic cabling or satellite uplinks may be used to connect this type of global network.

Using a WAN, schools in Florida can communicate with places like Tokyo in a matter of seconds, without paying enormous phone bills. Two users a half-world apart with workstations equipped with microphones and a webcams might teleconference in real time. A WAN is complicated. It uses multiplexers, bridges, and routers to connect local and metropolitan networks to global communications networks like the Internet. To users, however, a WAN will not appear to be much different than a LAN.

Advantages of Installing a School Network

User access control. Modern networks almost always have one or more servers which allows centralized management for users and for network resources to which they have access. User credentials on a privately-owned and operated network may be as simple as a user name and password, but with ever-increasing attention to computing security issues, these servers are critical to ensuring that sensitive information is only available to authorized users. Information storing and sharing. Computers allow users to create and manipulate information. Information takes on a life of its own on a network. The network provides both a place to store the information and mechanisms to share that information with other network users. Connections. Administrators, instructors, and even students and guests can be connected using the campus network. Services. The school can provide services, such as registration, school directories, course schedules, access to research, and email accounts, and many others. (Remember, network services are generally provided by servers). Internet. The school can provide network users with access to the internet, via an internet gateway. Computing resources. The school can provide access to special purpose computing devices which individual users would not normally own. For example, a school network might have high-speed high quality printers strategically located around a campus for instructor or student use. Flexible Access. School networks allow students to access their information from connected devices throughout the school. Students can begin an assignment in their classroom, save part of it on a public access area of the network, then go to the media center after school to finish their work. Students can also work cooperatively through the network. Workgroup Computing. Collaborative software allows many users to work on a document or project concurrently. For example, educators located at various schools within a county could simultaneously contribute their ideas about new curriculum standards to the same document, spreadsheets, or website. Expensive to Install. Large campus networks can carry hefty price tags. Cabling, network cards, routers, bridges, firewalls, wireless access points, and software can get expensive, and the installation would certainly require the services of technicians. But, with the ease of setup of home networks, a simple network with internet access can be setup for a small campus in an afternoon. Requires Administrative Time. Proper maintenance of a network requires considerable time and expertise. Many schools have installed a network, only to find that they did not budget for the necessary administrative support. Servers Fail. Although a network server is no more susceptible to failure than any other computer, when the files server "goes down" the entire network may come to a halt. Good network design practices say that critical network services (provided by servers) should be redundant on the network whenever possible. Cables May Break. The Topology chapter presents information about the various configurations of cables. Some of the configurations are designed to minimize the inconvenience of a broken cable; with other configurations, one broken cable can stop the entire network. Security and compliance. Network security is expensive. It is also very important. A school network would possibly be subject to more stringent security requirements than a similarly-sized corporate network, because of its likelihood of storing personal and confidential information of network users, the danger of which can be compounded if any network users are minors. A great deal of attention must be paid to network services to ensure all network content is appropriate for the network community it serves.

A Computer Network is a group of two or more interconnected computer systems that use common connection protocols for sharing various resources and files. You can establish a computer network connection using either cable or wireless media. Every network involves hardware and software that connects computers and tools.

In this Computer networking tutorial, you will learn:

There are various types of Computer Networking options available. The classification of network in computers can be done according to their size as well as their purpose.

The size of a network should be expressed by the geographic area and number of computers, which are a part of their networks. It includes devices housed in a single room to millions of devices spread across the world. Following are the popular types of Computer Network:

Types of Computer Networks

Some of the most popular computer network types are:

PAN (Personal Area Network)
LAN (Local Area Network)
MAN (Metropolitan Area Network)
WAN (Wide Area Network)

Let’s study all of these types of networking in detail.

PAN (Personal Area Network) is a computer network formed around a person. It generally consists of a computer, mobile, or personal digital assistant. PAN can be used for establishing communication among these personal devices for connecting to a digital network and the internet.

Below are the main characteristics of PAN:

It is mostly personal devices network equipped within a limited area.
Allows you to handle the interconnection of IT devices at the surrounding of a single user.
PAN includes mobile devices, tablet, and laptop.
It can be wirelessly connected to the internet called WPAN.
Appliances use for PAN: cordless mice, keyboards, and Bluetooth systems.

Here are the important pros/benefits of PAN network:

PAN networks are relatively secure and safe
It offers only short-range solution up to ten meters
Strictly restricted to a small area

Disadvantages of PAN

Here are the cons/drawbacks of using PAN network:

It may establish a bad connection to other networks at the same radio bands.
Distance limits.

A Local Area Network (LAN) is a group of computer and peripheral devices which are connected in a limited area such as school, laboratory, home, and office building. It is a widely useful network for sharing resources like files, printers, games, and other application. The simplest type of LAN network is to connect computers and a printer in someone’s home or office. In general, LAN will be used as one type of transmission medium. It is a network which consists of less than 5000 interconnected devices across several buildings.

Local Area Network (LAN)

Here are the important characteristics of a LAN network:

It is a private network, so an outside regulatory body never controls it.
LAN operates at a relatively higher speed compared to other WAN systems.
There are various kinds of media access control methods like token ring and ethernet.

Here are the pros/benefits of LAN:

Computer resources like hard-disks, DVD-ROM, and printers can share local area networks. This significantly reduces the cost of hardware purchases.
You can use the same software over the network instead of purchasing the licensed software for each client in the network.
Data of all network users can be stored on a single hard disk of the server computer.
You can easily transfer data and messages over networked computers.
It will be easy to manage data at only one place, which makes data more secure.
Local Area Network offers the facility to share a single internet connection among all the LAN users.

Here are the cons/drawbacks of LAN:

LAN will indeed save cost because of shared computer resources, but the initial cost of installing Local Area Networks is quite high.
The LAN admin can check personal data files of every LAN user, so it does not offer good privacy.
Unauthorized users can access critical data of an organization in case LAN admin is not able to secure centralized data repository.
Local Area Network requires a constant LAN administration as there are issues related to software setup and hardware failures

WAN (Wide Area Network) is another important computer network that which is spread across a large geographical area. WAN network system could be a connection of a LAN which connects with other LAN’s using telephone lines and radio waves. It is mostly limited to an enterprise or an organization.

Wide Area Network (WAN)

Below are the characteristics of WAN:

The software files will be shared among all the users; therefore, all can access to the latest files.
Any organization can form its global integrated network using WAN.

Here are the benefits/pros of WAN:

WAN helps you to cover a larger geographical area. Therefore business offices situated at longer distances can easily communicate.
Contains devices like mobile phones, laptop, tablet, computers, gaming consoles, etc.
WLAN connections work using radio transmitters and receivers built into client devices.

Disadvantages of WAN

Here are the drawbacks/cons of WAN network:

The initial setup cost of investment is very high.
It is difficult to maintain the WAN network. You need skilled technicians and network administrators.
There are more errors and issues because of the wide coverage and the use of different technologies.
It requires more time to resolve issues because of the involvement of multiple wired and wireless technologies.
Offers lower security compared to other types of network in computer.

Also Check: LAN vs WAN: What’s the Difference?

A Metropolitan Area Network or MAN is consisting of a computer network across an entire city, college campus, or a small region. This type of network is large than a LAN, which is mostly limited to a single building or site. Depending upon the type of configuration, this type of network allows you to cover an area from several miles to tens of miles.

Metropolitan Area Network (MAN)

Here are important characteristics of the MAN network:

It mostly covers towns and cities in a maximum 50 km range
Mostly used medium is optical fibers, cables
Data rates adequate for distributed computing applications.

Here are the pros/benefits of MAN network:

It offers fast communication using high-speed carriers, like fiber optic cables.
It provides excellent support for an extensive size network and greater access to WANs.
The dual bus in MAN network provides support to transmit data in both directions concurrently.
A MAN network mostly includes some areas of a city or an entire city.

Disadvantages of MAN

Here are drawbacks/cons of using the MAN network:

You need more cable to establish MAN connection from one place to another.
In MAN network it is tough to make the system secure from hackers

Apart from above mentioned computer networks, here are some other important types of networks:

WLAN (Wireless Local Area Network)
Storage Area Network
System Area Network
Home Area Network
POLAN- Passive Optical LAN
Enterprise private network
Campus Area Network
Virtual Area Network

Let’s see all these different types of networks in detail:

1) WLAN

WLAN (Wireless Local Area Network) helps you to link single or multiple devices using wireless communication within a limited area like home, school, or office building. It gives users an ability to move around within a local coverage area which may be connected to the network. Today most modern day’s WLAN systems are based on IEEE 802.11 standards.

2) Storage-Area Network (SAN)

A Storage Area Network is a type of network which allows consolidated, block-level data storage. It is mainly used to make storage devices, like disk arrays, optical jukeboxes, and tape libraries.

3) System-Area Network

System Area Network is used for a local network. It offers high-speed connection in server-to-server and processor-to-processor applications. The computers connected on a SAN network operate as a single system at quite high speed.

4) Passive Optical Local Area Network

POLAN is a networking technology which helps you to integrate into structured cabling. It allows you to resolve the issues of supporting Ethernet protocols and network apps.

POLAN allows you to use optical splitter which helps you to separate an optical signal from a single-mode optical fiber. It converts this single signal into multiple signals.

5) Home Area Network (HAN):

A Home Area Network is always built using two or more interconnected computers to form a local area network (LAN) within the home. For example, in the United States, about 15 million homes have more than one computer.

These types of network connections help computer owners to interconnect with multiple computers. This network allows sharing files, programs, printers, and other peripherals.

6) Enterprise Private Network :

Enterprise private network (EPN) networks are build and owned by businesses that want to securely connect numerous locations in order to share various computer resources.

7) Campus Area Network (CAN):

A Campus Area Network is made up of an interconnection of LANs within a specific geographical area. For example, a university campus can be linked with a variety of campus buildings to connect all the academic departments.

8) Virtual Private Network:

A VPN is a private network which uses a public network to connect remote sites or users together. The VPN network uses “virtual” connections routed through the internet from the enterprise’s private network or a third-party VPN service to the remote site.

It is a free or paid service that keeps your web browsing secure and private over public WiFi hotspots.

Summary

Types of connections in computer networks can be categorized according to their size as well as their purpose
PAN is a computer network which generally consists of a computer, mobile, or personal digital assistant
LAN (Local Area Network) is a group of computer and peripheral devices which are connected in a limited area
WAN (Wide Area Network) is another important computer network that which is spread across a large geographical area
A metropolitan area network or MAN is consisting of a computer network across an entire city, college campus, or a small region
WLAN is a wireless local area network that helps you to link single or multiple devices using. It uses wireless communication within a limited area like home, school, or office building.
SAN is a storage area network is a type of network which allows consolidated, block-level data storage
System area network offers high-speed connection in server-to-server applications, storage area networks, and processor-to-processor applications
POLAN is a networking technology which helps you to integrate into structured cabling
Home network (HAN) is a always built using two or more interconnected computers to form a local area network (LAN) within the home
Enterprise private network (EPN) networks are build and owned by businesses that want to securely connect various locations
Campus area network (CAN) is made up of an interconnection of LANs in a specific geographical area
A VPN is a private network which uses a public network to connect remote sites or users together
What does LAN stand for? – LAN stands for Local Area Network.
What is the difference between LAN and WAN? – LAN is a computer network that covers a small geographic area, like a home, office, or group of buildings, while WAN is a computer network that covers a broader area.