Local area network (LAN) is a network that connects computers and devices in a limited geographical area such as homes, schools, computer labs, office buildings, or closely positioned group of buildings. Every computer or device on the network vertices are nodes. LAN cable is great based on Ethernet technology, although new standards such as ITU-T G.hn also provides a way to make a wired LAN using the existing home cable (coaxial cable, telephone lines and electricity cables).
All devices that are interconnected must understand the network layer (layer 3), because they handle several subnets (different colors). They are in the library, which is only 10/100 Mbit / s Ethernet connection to the device user and Gigabit Ethernet connections to a central router, could be called "layer 3 switches" because they only have Ethernet interfaces and must understand IP. It would be more appropriate to call them access routers, where the router at the top is the distribution router that connects to the Internet and academic networks' customer access routers.
Defining characteristics of LANs, in contrast to WANs (Wide Area Network), include a higher level of data transfer, smaller geographic range, and do not need to lease telecommunication network. Now Ethernet or other IEEE 802.3 LAN technologies operate at speeds up to 10 Gbit / s. This is the speed of data transfer. IEEE has projects investigating the standardization of 40 and 100 Gb / s. [5]
All devices that are interconnected must understand the network layer (layer 3), because they handle several subnets (different colors). They are in the library, which is only 10/100 Mbit / s Ethernet connection to the device user and Gigabit Ethernet connections to a central router, could be called "layer 3 switches" because they only have Ethernet interfaces and must understand IP. It would be more appropriate to call them access routers, where the router at the top is the distribution router that connects to the Internet and academic networks' customer access routers.
Defining characteristics of LANs, in contrast to WANs (Wide Area Network), include a higher level of data transfer, smaller geographic range, and do not need to lease telecommunication network. Now Ethernet or other IEEE 802.3 LAN technologies operate at speeds up to 10 Gbit / s. This is the speed of data transfer. IEEE has projects investigating the standardization of 40 and 100 Gb / s. [5]
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