A ________ is two or more computers that share resources.

Network Communications Standards

Inhaltsverzeichnis Show

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:

Today’s networks connect terminals, devices, and computers from many different manufacturers across many types of networks, such as wide area, local area, and wireless. For the different devices on various types of networks to be able to communicate, the network must use similar techniques of moving data through the network from one application to another.

To alleviate the problems of incompatibility and ensure that hardware and software components can be integrated into any network, various organizations such as ANSI and IEEE (pronounced I triple E) propose, develop, and approve network standards. A network standard defines guidelines that specify the way computers access the medium to which they are attached, the type(s) of medium used, the speeds used on different types of networks, and the type(s) of physical cable and/or the wireless tech- nology used. A standard that outlines characteristics of how two network devices communicate is called a protocol. Hardware and software manufacturers design their products to meet the guidelines specified in a particular standard, so that their devices can communicate with the network.

The following sections discuss some of the more widely used network communications standards for both wired and wireless networks including Ethernet, token ring, TCP/IP, 802.11 (Wi-Fi), Bluetooth, UWB, IrDA, RFID, WiMAX, and WAP.

ETHERNET Ethernet is a network standard that specifies no central computer or device on the network (nodes) should control when data can be transmitted; that is, each node attempts to trans- mit data when it determines the network is able to receive communications. If two computers on an Ethernet network attempt to send data at the same time, a collision occurs, and the computers must attempt to send their messages again.

Ethernet is based on a bus topology, but Ethernet networks can be wired in a star pattern. The Ethernet standard defines guidelines for the physical configuration of the network, e.g., cabling, network cards, and nodes. Today, Ethernet is the most popular LAN standard because it is relatively inexpensive and easy to install and maintain. Ethernet networks often use cables to transmit data.

TOKEN RING The token ring standard specifies that computers and devices on the network share or pass a special signal, called a token, in a unidirectional manner and in a preset order. A token is a special series of bits that function like a ticket. The device with the token can transmit data over the network. Only one token exists per network. This ensures that only one computer transmits data at a time. Token ring is based on a ring topology (although it can use a star topology). The token ring standard defines guidelines for the physical configuration of a network. Some token ring networks connect up to 72 devices. Others use a special type of wiring that allows up to 260 connections.

TCP/IP Short for Transmission Control Protocol/Internet Protocol, TCP/IP is a network standard, specifically a protocol, that defines how messages (data) are routed from one end of a network to the other. TCP/IP describes rules for dividing messages into small pieces, called packets; providing addresses for each packet; checking for and detecting errors; sequencing packets; and regulating the flow of messages along the network.

TCP/IP has been adopted as a network standard for Internet communications. Thus, all hosts on the Internet follow the rules defined in this standard. Internet communications also use other standards, such as the Ethernet standard, as data is routed to its destination.

When a computer sends data over the Internet, the data is divided into packets. Each packet contains the data, as well as the recipient (destination), the origin (sender), and the sequence information used to reassemble the data at the destination. Each packet travels along the fastest individual available path to the recipient’s computer via communications devices called routers.

802.11 (WI-FI) Developed by IEEE, 802.11 also known as Wi-Fi (wireless fidelity) and wireless Ethernet, is a series of network standards that specifies how two wireless devices communicate over the air with each other. Using Wi-Fi, computers or devices that have the appropriate wireless capa- bility communicate via radio waves with other computers or devices. The Wi-Fi standard uses tech- niques similar to the Ethernet standard to specify how physically to configure a wireless network. Most of today’s computers and many personal mobile devices, such as smart phones and handheld game consoles, are Wi-Fi enabled.

One popular use of the Wi-Fi standard is in hot spots that offer mobile users the ability to connect to the Internet with their Wi-Fi enabled wireless computers and devices. Many homes and small businesses also use Wi-Fi to network computers and devices together wirelessly.

BLUETOOTH Bluetooth is a standard, specifically a protocol, that defines how two Bluetooth devices use short-range radio waves to transmit data. To communicate with each other, Bluetooth devices often must be within about 10 meters (about 33 feet) but can be extended to 100 meters with additional equip- ment. Examples of Bluetooth devices can include desktop computers, notebook computers, handheld computers, smart phones, PDAs, headsets, microphones, digital cameras, and printers.

UWB UWB, which stands for ultra-wideband, is a network standard that specifies how two UWB devices use short-range radio waves to communicate at high speeds with each other. For optimal com- munications, the devices should be within 2 to 10 meters (about 6.5 to 33 feet) of each other. Examples of UWB uses include wirelessly transferring video from a digital video camera, printing pictures from a digital camera, downloading media to a portable media player, or displaying a slide show on a projector.

IRDA Some computers and devices use the IrDA specification to transmit data wirelessly to each other via infrared (IR) light waves. Infrared requires a line-of-sight transmission; that is, the sending device and the receiving device must be in line with each other so that nothing obstructs the path of the infrared light wave.

RFID RFID (radio frequency identification) is a standard, specifically a protocol, that defines how a network uses radio signals to communicate with a tag placed in or attached to an object, an animal, or a person. The tag consists of an antenna and a memory chip that contains the information to be transmitted via radio waves. Through an antenna, an RFID reader reads the radio signals and trans- fers the information to a computer or computing device. Readers can be handheld or embedded in an object such as a doorway or tollbooth.

WIMAX WiMAX (Worldwide Interoperability for Microwave Access), also known as 802.16, is a newer network standard developed by IEEE that specifies how wireless devices communicate over the air in a wide area. Using the WiMAX standard, computers or devices with the appropriate WiMAX wireless capability communicate via radio waves with other computers or devices via a WiMAX tower. The WiMAX tower, which can cover up to a 30-mile radius, connects to the Internet or to another WiMAX tower.

Two types of WiMAX specifications are fixed wireless and mobile wireless. With fixed wire- less WiMAX, a customer accesses the Internet from a desktop computer at home or other permanent location. Mobile wireless WiMAX, by contrast, enables users to access the WiMAX network with mobile computers and mobile devices such as smart phones.

The WiMAX standard provides wireless broadband Internet access at a reasonable cost over long distances to business and home users. The WiMAX standard, similar to the Wi-Fi stan- dard, connects mobile users to the Internet via hot spots. The next generation of game consoles also plans to support the WiMAX standard.

WAP The Wireless Application Protocol (WAP) is a standard, specifically a protocol, that specifies how some mobile devices such as smart phones can display the content of Internet services such as the Web, e-mail, and chat rooms. For example, users can check weather, sports scores, and headline news from their WAP-enabled smart phone. To display a Web page on a smart phone, the phone should contain a microbrowser. WAP uses a client/server network. The wireless device contains the client software, which connects to the Internet access provider’s server.

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.