A LAN can include a wide variety of other network devices such as firewalls , load balancers , and network intrusion detection.
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LANs can maintain connections with other LANs via leased lines, leased services, or across the Internet using virtual private network technologies. Depending on how the connections are established and secured, and the distance involved, such linked LANs may also be classified as a metropolitan area network MAN or a wide area network WAN. From Wikipedia, the free encyclopedia. For other uses, see Lan.
LAN - Local Area Network
Donahue June Network Warrior. Mendicino Archived from the original on Courant symposium series on networks. University of Cambridge. Archived from the original on 13 November Retrieved September 10, Smithsonian National Museum of American History.
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- personal area network (PAN).
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Categories : Local area networks Office equipment. Namespaces Article Talk. Views Read Edit View history. In other projects Wikimedia Commons. The data terminal equipment may be a single piece of equipment or multiple pieces of equipment that are interconnected and perform all the required functions to allow the user to communicate. They may be either standalone devices such as repeaters, network switches, routers or maybe communications interface units such as interface cards and modems. It is generally used for backbones in high-end applications requiring high data rates.
It provided data transmission between computers on several of the Hawaiian Islands involving packet radio networks.
Aloha is a multiple access protocol at the data link layer and proposes how multiple terminals access the medium without interference or collision. Pure Aloha Pure Aloha is an un-slotted, decentralized, and simple to implement a protocol. It does not check whether the channel is busy or not before transmitting. In case, two or more stations transmit simultaneously, the collision occurs and frames are destroyed. Whenever any station transmits a frame, it expects the acknowledgment from the receiver.
If it is not received within a specified time, the station assumes that the frame or acknowledgment has been destroyed.
Then, the station waits for a random amount of time and sends the frame again. This randomness helps in avoiding more collisions.
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This scheme works well in small networks where the load is not much. But in largely loaded networks, this scheme fails poorly.
This led to the development of Slotted Aloha. To assure pure aloha: Its throughput and rate of transmission of the frame to be predicted.
Introduction to LANs, WANs, and Other Kinds of Area Networks
For that to make some assumption: i All the frames should be the same length. Slotted Aloha This is quite similar to Pure Aloha, differing only in the way transmissions take place. Instead of transmitting right at demand time, the sender waits for some time.