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ccna practice questions free.Mobile users Users who may connect to the network from any location, LAN or WANCorporate headquarters Site where most of the organization's users and resources reside1.1.4 Local Area Network (LAN)A local area network (LAN) is used to connect network devices within a small area (such as a floor, building, or campus environment). In a LAN, there may bePCs, file servers, hubs, bridges, switches, routers, multilayer switches, voice gateways, firewalls, and other devices.The types of media used in a LAN include copper cable and fiber optic cable. Frame types that may be used to communicate between components connected by fiber and copper cables include Ethernet, Fast Ethernet (FE), Gigabit Ethernet (GE), Token Ring, and Fiber Distributed Data Interface (FDDI). Currently, most networks use some form of Ethernet, which will be discussed in Chapter 3.Ethernet has become the de facto standard for LANs, so understanding the Ethernet topology and how it works is critical to implementing a corporate network. Today's networks rarely use hubs and bridges; these devices have been replaced by switches.1.1.5 Wide Area NetworksA Wide Area Network (WAN) is used to connect multiple LANs, and when LANs that are far apart need to be connected, a WAN is usually required. oLAN infrastructure is provided by its company, and WANs are leased from carriers such as telephone companies and Internet Service Providers (ISPs). there are four basic types of connections (circuits) used for WAN services: circuit-switched, element-switched, packet-switched, and private connections. packet switching, and private connections.LANs provide high-speed broadband connections for interconnecting components in smaller areas such as buildings or campuses.WANs provide lower-speed broadband connections for interconnecting multiple sites. To use a WAN, you need to pay a monthly fee to the service provider.There are many types of WAN services on the market, including analog dial-up, asynchronous transfer mode (ATM), private circuit, cable, digital subscriber line (DSLk frame relay, integrated services digital network (ISDN), and X.25 O. Analog dial-up and ISDN are circuit-switched services, ATM is an element-switched service, and frame relay and X.25 are packet-switched services.