Local Area Network And Wide Area Network Pdf

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local area network and wide area network pdf

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A local area network LAN is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building.

Minimizing Risk in Your Wide Area Network Design

If you understand the fundamental objectives of your organization and how your telecommunication network assists you to achieve these objectives you will have a sound basis for the development of network security. The types of potential interruption must also be understood remembering that small, intermittent failures can be worse than complete collapse. Risk exposures can be prioritized and contingency plans established. Duplicated carrier communications, private network triangulation, and virtual private networks are considered as well as ISDN and switched backup services. The consolidation of discrete services to make switching to alternative sites much easier is also suggested. Bell, G. Report bugs here.

We own and operate these networks. Perhaps in one building or a few buildings close to each other called a campus. As the name implies, WANs cover large geographical areas. This could be a network between two cities or as large as the Internet. They build large networks that span entire cities or regions and lease the right to use their networks to their customers.

In its simplest form, a wide-area network WAN is a collection of local-area networks LANs or other networks that communicate with one another. Today, there are several types of WANs, built for a variety of use cases that touch virtually every aspect of modern life. Packet switching is a method of data transmission in which a message is broken into several parts, called packets, that are sent independently, in triplicate, over whatever route is optimum for each packet, and reassembled at the destination. Each packet contains a piece part, called the payload, and an identifying header that includes destination and reassembly information. The packets are sent in triplicate to check for packet corruption. Every packet is verified in a process that compares and confirms that at least two copies match.

Computer Network Fundamentals

Local Area Network LAN is a computer network, which is limited to a small office, single building, multiple buildings inside a campus etc. It is nearly impossible for a small to medium organization except Network Service Providers to pull network cables between their two offices in two different countries located s of kilometers away. The aerial distance between Chennai and Manila is about 4, kilometers. It is almost impossible for a small to medium business to draw cables between Chennai and Manila. We normally avail the services of an Internet Service Provider for connectivity between these two offices. Example: A small office, A Single building, Multiple buildings inside a campus etc. Wide Area Networks WAN is type of computer network to connect offices which are located in different geographical locations.

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. 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.


One way to categorize networks is to divide them into local-area networks (LAN) and wide-area networks (WAN). LANs typically are connected workstations.


What Is a WAN? Wide-Area Network

There are various types of computer networks available. We can categorize them 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. What is LAN?

Local Area Networks (LAN) and Wide Area Networks (WAN), Difference between LAN and WAN

Wide Area Networks (WAN)

You need Adobe Reader 7. If Adobe Reader is not installed on your computer, click the button below and go to the download site. This article introduces a partial-bandwidth-guaranteed service system and a service-area expansion system that we have developed in order to improve the performance of wide-area Ethernet networks. The developed systems will enable new added services and provide a scheme for cost-efficient network expansion. Keywords: wide-area Ethernet service, partial-bandwidth-guaranteed service system, service-area expansion system. Wide-area Ethernet services have been commercially available since and have been providing high-speed circuit services at a reasonable cost compared to conventional leased-line services. This article introduces a partial-bandwidth-guaranteed service system and a service-area expansion system that address these requirements by improving the access systems of wide-area Ethernet networks Fig.

A wide area network WAN is a telecommunications network that extends over a large geographic area for the primary purpose of computer networking. Wide area networks are often established with leased telecommunication circuits. Businesses, as well as schools and government entities, use wide area networks to relay data to staff, students, clients, buyers and suppliers from various locations across the world. In essence, this mode of telecommunication allows a business to effectively carry out its daily function regardless of location. The Internet may be considered a WAN. The textbook definition of a WAN is a computer network spanning regions, countries, or even the world.

 Мидж, я ни под каким видом не пущу тебя в кабинет директора. - Ты должен это сделать! - потребовала она и, отвернувшись, начала что-то печатать на клавиатуре Большого Брата.  - Мне нужен список очередности работы на ТРАНСТЕКСТЕ. Если Стратмор обошел фильтры вручную, данный факт будет отражен в распечатке. - Какое отношение это имеет к директорскому кабинету. Мидж повернулась на вращающемся стуле. - Такой список выдает только принтер Фонтейна.

 Молодой человек, - вскипел Стратмор, - я не знаю, откуда вы черпаете свою информацию, но вы переступили все допустимые границы. Вы сейчас же отпустите мисс Флетчер, или я вызову службу безопасности и засажу вас в тюрьму до конца ваших дней. - Вы этого не сделаете, - как ни в чем не бывало сказал Хейл.

Кабинет постепенно утопал в дыму. Стало трудно дышать. Сьюзан бессильно прижалась к двери, за которой, всего в нескольких сантиметрах от нее, работала вентиляция, и упала, задыхаясь и судорожно хватая ртом воздух.

На перекрестке он свернул вправо, улица стала пошире. Со всех сторон открывались ворота, и люди вливались в поток. Колокола звонили где-то совсем рядом, очень громко. Беккер чувствовал жжение в боку, но кровотечение прекратилось.

Единственным звуком, достигавшим его ушей, был едва уловимый гул, шедший снизу. Сьюзан хотелось потянуть шефа назад, в безопасность его кабинета. В кромешной тьме вокруг ей виделись чьи-то лица. На полпути к ТРАНСТЕКСТУ тишина шифровалки нарушилась.

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