Virtual Private Network is a private network that is constructed within a public network,infrastructure such as the global Internet,using VPN, a telecommuter.

 Bandwidth in computer networking refers to the data rate supported by a network connection or interface. One most commonly expresses bandwidth in terms of bits per second(bps). The term comes from the field of electrical engineering, where bandwidth represents the total distance or range between the highest and lowest signals on the communication channel (band).

Bandwidth represents the capacity of the connection. The greater the capacity, the more likely that greater performance will follow, though overall performance also depends on other factors, such as latency.

   WANs ( Wide Area Network) is to operate over a large geographic area.Allow access over serial ineterfaces operating at lower speeds,provide full time and part time connectivity.Connect devices seperated overwide even global area.WAN using Router,Communication Server ,Modem CSO/DSU,TA/NT1.

COMMUNICATION SERVER                                             MODEM DSU

 Modem  TA 128

       LANs ( Local Area Network) is seperate within a limited geographic area.Allow multiple access to high bandwidth media,to control the network privately under local administration.Provide full time connectivity to local services,connect physically adjacent devices.LANs using Router,Bridge,Hub,Ethernet,Switch and Repeater.



ROUTER BRIDGE
 HUBSWITCH