Classification of Computer network
Types of area networks – LAN, MAN and WAN The Network allows computers to connect and communicate with different computers via any medium. LAN, MAN and WAN are the three major types of the…
Criteria for a Data Communication Network
The major criteria that a Data Communication Network must meet are: Performance Consistency Reliability Recovery Security 6a. Performance Performance is the defined as the rate of transferring error free data.…
Ethernet Learning Algorithm
Traditional Ethernet switches use datagram forwarding as described in 1.4 Datagram Forwarding; the trick is to build their forwarding tables without any cooperation from ordinary, non-switch hosts. Indeed, to the…
Ethernet Switches
Switches join separate physical Ethernets (or sometimes Ethernets and other kinds of networks). A switch has two or more Ethernet interfaces; when a packet is received on one interface it…
Gigabit Ethernet
The problem of scaling Ethernet to handle collision detection gets harder as the transmission rate increases. If we were continue to maintain the same 51.2 µsec slot time but raise…
100 Mbps (Fast) Ethernet
Classic Ethernet, at 10 Mbps, is quite slow by modern standards, and so by 1995 the IEEE had created standards for Ethernet that operated at 100 Mbps. Ethernet at this…
Analysis of Classic Ethernet
How much time does Ethernet “waste” on collisions? A paradoxical attribute of Ethernet is that raising the transmission-attempt rate on a busy segment can reduce the actual throughput. More transmission…
CSMA persistence
A carrier-sense/multiple-access transmission strategy is said to be nonpersistent if, when the line is busy, the sender waits a randomly selected time. A strategy is p-persistent if, after waiting for…
Errors
Packets can have bits flipped or garbled by electrical noise on the cable; estimates of the frequency with which this occurs range from 1 in 104 to 1 in 106 .…
Hubs and topology
Ethernet hubs (multiport repeaters) change the topology, but not the fundamental constraints. Hubs enabled the model in which each station now had its own link to the wiring closet. Loops…
