What is the difference between a yellow and blue ethernet cable?

There's usually no difference, people just make the insulation in different colours. Sometimes there will be significance, like yellow for crossover and pale blue for rollover (Cisco style), I've ... Read More »
http://uk.answers.yahoo.com/question/index?qid=20080712060849AARow0r

Is there any difference between yellow ethernet cables and navy blue ethernet cables?

The color of the ethernet cable means nothing at all.There are different types of ethernet cables. Crossover, straight through, cat 5, cat 6 and so on, but again the color means nothing...
http://uk.answers.yahoo.com/question/index?qid=20080117130859AArFgpl

Same thing.A 'patch' cable is generally shorter as it's used to make the small jump from the switch to the distribution board, or the floor socket to the PC.But, mechanically they are exactly the s... Read More »
http://uk.answers.yahoo.com/question/index?qid=20080422051140AA4cMjT

Computer suppliers often advertise "Ethernet cable" for sale. But what is Ethernet cable? Ethernet is the name of a set of standards for networking specifically related to the physical elements of ... Read More »
http://www.ehow.co.uk/info_8546120_difference-network-cable-ethernet-cable.html

Your question makes no sense.There are patch cables (normal ethernet cables) and cross-over cables where the Rx pair at one end are connected to the Tx pair at the other.
http://uk.answers.yahoo.com/question/index?qid=20091109021134AAJxvLn