Extranet
Advantages of frame relay over x.25?Frame relay operates at a higher speed(1.544 mbps & currently 44.376mbps) By this it can easily be used instead of a mesh of T-1 or T-3 linesFrame relay operates in just the physical and data link layers. By this it is used as a back bone nwtwork to provide services to protoclols that already have a network layer protocol.It allows brusty data. in case of x.25 and t-line there is a fixed data rateFrame relay allows a frame size of 9000 bytes, which can accommodate all LAN framesFrame relay is less expensive than other traditional WAN
A network address is simply a code used by computers as a means of identification. Just like getting information to and from your home requires the postal service to know the house number and street name, a network address accomplishes the same thing for a computer network. Without some way of passing along this information, the idea of the Internet would be almost useless. Just like the postal service, a computer must know where it is sending information. The network address is a set of unique identifying sets of information that can be used to find the right destination. While many may have heard of such an identifier being used to crack identify theft schemes and other sorts of online crime, that is really just a small part of the overall importance of the address. Nearly all information will require this address.