I. Rewrite the extract filling in the missing letters

Identifying Network Types. Netwo…ks can be catego…ized by size as local a…ea netwo…ks (LANs) or wide are netwo…ks (WANs). They can also be clas…ified by t…pe, which incl…des client/se…ver, peer-to-peer, int…anet, ext…anet, and the Inte…net.

Local Area Networks (LAN). Most LANs connect pe…sonal compute…s, wo…kstations, and other dev…ces such as p…inters and scan…ers in a lim…ted geograp…ical a…ea, such as an of…ice bu…lding, sc…ool, or home. E…ch devi…e on the net…ork is called a no…e, and each node gene…ally sha…es resou…ces such as a p…inter, prog…ams, and other ha…dware.

Wireless LAN (WLAN). A wi…eless LAN (WLAN) is a va…iation of the LAN that uses few if any p…ysical wi…es to con…ect devi…es. To com…unicate on a WLAN, the comp…ter and other devi…es that ac…ess the net…ork must each cont…in a wi…eless dev…ce such as a ne…work ca…d, fla…h ca…d, PC ca…d, USB net…ork adap…er, or other t…pe of bu…lt-in wi…eless cap…bility or a wi…eless net…ork ca…d.

Wide Area Networks (WAN). A WAN cove…s a large geog…aphical a…ea and can cont…in com…unication lin…s acro…s met…opolitan, reg…onal, or nat…onal bou…daries. The com…unications area might be as la…ge as a st…te, count…y, or even the wo…ld. The la…gest WAN is the Inte…net. Most WANs con…ist of two or more LANs and are conne…ted by ro…ters, which dire…t traf…ic on the Internet or on m…ltiple con…ected netwo…ks. Communi…ations c…annels can incl…de telep…one systems, fiberopti…s, satell…tes, micro…aves, or any combin…tions of these.