The Complete Codes

Topology means the physical design of a network including the devices, location and cable installation. Logical Topology refers to the fact that how data actually transfers in a network as opposed to its design.

Computer Network | Ethernet (802.3) Ethernet is the most widely-installed local area network (LAN) technology. Ethernet was originally developed by Xerox from an earlier specification called Aloha net and then developed further by Xerox, DEC, and Intel. An Ethernet LAN typically uses coaxial cable or special grades of twisted pair wires. Ethernet is also used in wireless. Ethernet is standardized as IEEE 802.3 that specifies a CSMA/CD bus network. CSMA/CD (Carrier Sense Multiple Access / Collision Detect) is used to detect the collision in the network. An Ethernet CSMA/CD can be implemented using a Bus or even a Star topology.

Why CISC? •            Compiler simplification? –           Disputed… –           Complex machine instructions harder to exploit –           Optimization more difficult •            Smaller programs? –           Program takes up less memory but… –           Memory is now cheap –           May not occupy less bits, just look shorter in symbolic form •            More instructions require longer op-codes •            Register references require fewer bits •            Faster programs? –           Bias towards use of simpler instructions –           More complex control unit –           Microprogram control store larger –           thus simple instructions take longer to execute –           It is far from clear that CISC is the appropriate solution