Types of Networks
•Local area networks
•Wide area networks
•The Internet: It’s a WAN in many respects
•Intranets an intranet is a private Internet.
•Extranets: not open with the general public
•Wide area networks
•The Internet: It’s a WAN in many respects
•Intranets an intranet is a private Internet.
•Extranets: not open with the general public
LANs
lDefinition – Wireless LAN
lA local area network that transmits over the air typically in an unlicensed frequency such as the 2.4GHz band.
lA wireless LAN does not require lining up devices for line of sight transmission.
lWireless access points (base stations) are connected to an Ethernet hub or server and transmit a radio frequency over an area of several hundred to a thousand feet which can penetrate walls and other non-metal barriers.
lLaptops use wireless network cards that plug into an existing slot or that are self contained on PC cards, while stand-alone desktops and servers use plug-in cards (ISA, PCI, etc.).
lDefinition – Wireless LAN
lA local area network that transmits over the air typically in an unlicensed frequency such as the 2.4GHz band.
lA wireless LAN does not require lining up devices for line of sight transmission.
lWireless access points (base stations) are connected to an Ethernet hub or server and transmit a radio frequency over an area of several hundred to a thousand feet which can penetrate walls and other non-metal barriers.
lLaptops use wireless network cards that plug into an existing slot or that are self contained on PC cards, while stand-alone desktops and servers use plug-in cards (ISA, PCI, etc.).
lCharacteristics – LAN
lTopology
lThe geometric arrangement of devices on the network or the shape of a local-area network (LAN) or other communications system.
lProtocols
lThe rules and encoding specifications for sending data. The protocol defines the format and meaning of the data that is exchanged. The protocols also determine whether the network uses a peer-to-peer or client/server architecture.
lMedia
lDevices can be connected by twisted-pair wire, coaxial cables, or fiber optic cables. Some networks do without connecting media altogether, communicating instead via radio waves.
Sample LAN Implementation
Business Configuration
Business Configuration
Requirements for a Network
•Physical (cable) or wireless
•A common set of communications
rules, aka a network protocol
•Software that enables resources to be served
to or shared with other network-enabled
devices and that controls access to the
shared resources
•Resources that can be shared
•Software that enables computers to
access other computers sharing resources
•Physical (cable) or wireless
•A common set of communications
rules, aka a network protocol
•Software that enables resources to be served
to or shared with other network-enabled
devices and that controls access to the
shared resources
•Resources that can be shared
•Software that enables computers to
access other computers sharing resources