Too many computers connected, and trying to transmit at the same time; and the use of switches instead of hubs.
Excessive broadcasts, and using hubs instead of switches or routers to segment the network.
The overall network length exceeds IEEE 802.3 standards for that network type.A server on the network contains a faulty NIC.
B. Excessive late collisions
Collisions
To prevent collisions.
by comparinig the xmit line to the recieve line and look for differences
-100
Full Duplex Ethernet uses no network control protocal to prevent collisions. This is because full duplex has a deicated channell for transmit and receive. When communicating in full duplex mode, there is no area to have a collision.
Excessive broadcast traffic can cause network congestion, and cause systems within that broadcast domains to be slowed down by having to process large amounts of packets.
Install a switch.
When a collision occurs, the stations back off and stop transmitting. After a randomly chosen period of delay, the data is resent.
Late collisions are collisions that happen after the first 512 bits of the ethernet frame. These losses are not recovered by the network layer; it is up to the higher protocols to rerequest data if any was lost. The most common cause by far is a duplex mismatch. Check to be sure both sides of the connection agree on either half-duplex or full-duplex. Other causes include cable lengths exceeding the 100-meter standard, a inappropriately large number of hubs in the network, or faulty ethernet cards.