You can search all day long and not find a direct answer about collisions and NIC settings. Why not always just use full duplex? Doesn't it just talk and receive at the same time on doifferent wires. What is the threshold of collions? Before the switches collisions were normal. Why are there still collision and when is it a problem?
In half duplex operation the transmit and receive pairs of the NIC are looped (short circuited) in order to detect collision. So when a NIC sends out a frame it loops the sent frame on to its receive pair as well.This concept can be explained with a hub scenario wherein you have say four PC's (PC1, PC2, PC3, PC4) connected to a hub. Consider a situation where PC2 and PC4 are transmitting at the same time. The hub repeats the frame on all its ports except the source port. The signal sent by PC2 is sent to PC4 on its receive pair, and similarly the signal sent by PC4 is sent to PC2 on its receive pair. Let us now see how PC2 detects the collison. Since the receive pair is already looped with the transmit pair, the incoming signal from PC4 plus the looped signal lets PC2 know that there is a collison. Thats the reason in Half duplex operation the NIC cant send and receive at the same time
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.