1st _ Lan (Local Area Network) :
the Local Area Network its its covering asmall physical area like company ore home or use small grouping in the building and this Lan its too speed its between 10Mb or 100Mb or 1000Mb or 10Gb and the destance about it 1 k.m ..
2st _ Man (metropolitan area network) :
the metropolitan area network is larger than Lan it can be in the city or in the larg places and the metropolitan area network is interconnects a number of Lans by using abackbone cables but the destance abot man can be 1-10 k.m and MANs can also depend on communications channels of moderate-to-high data rates. A MAN might be owned and operated by a single organization, but it usually will be used by many individuals and organizations. MANs might also be owned and operated as public utilities. They will often provide means for internetworking of Local Networks for example google company !
3rd _ Wan (Wide Area Network) :
the Wide Area Network meaning its broad area and its contains alot of Networks connected to each other hmm so we can called the internet is Wan .. ya you can say the internet is the Wan Network ...
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