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CCNA Question about cat5 cabling
    #7169963 -

This is kind of a crap shoot, but I was hoping someone here is cisco certified. I'm studying for my CCNA exam, and I have a question about cat5 cabling.

The cisco books state that pins 1 and 2 are used for transmission, and pins 3 and 6 are used for recieving. Now, suppose you're connecting a PC to a switch - if the pc sends from pins 1 and 2, the switch will be receiving on pins 1 and 2. Doesn't this go against what cisco earlier described? The book then goes into detail abotu crossover cables, but it still has me a little confused. A little help would greatly be appreciated. Thanks!


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You can turn your back on a person, but never turn your back on a drug, especially when its waving a razor sharp hunting knife in your eye.
Hunter S. Thompson

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Re: CCNA Question about cat5 cabling [Re: wiggles]
    #7169996 -

Don't confuse the wiring at a node to the wiring at a network device. The wiring at a node (computer, etc) is what you described above. The wiring at a network device (switch, hub, router) will be different (opposite pairs). If you are looking this up, search on MDI and MDIX, as those are the two ends. (MDI is your node and MDIX is your network device).

Edit: Just to be clear, when I speak of the wiring being different, I am not talking about the order of the wires on the patch/cross cable, but rather the manner in which the port is configured internally to the device.

Edit edit: MDI ports connect to MDIX ports via straight-through twisted pair cabling; both MDI-to-MDI and MDIX-to-MDIX connections use crossover twisted pair cabling


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Just another spore in the wind.

Edited by Seuss (07/13/07 06:23 AM)

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Re: CCNA Question about cat5 cabling [Re: Seuss]
    #7170036 -

Ahhhh ok, so is that why a lot of ports on switches and routers are auto-sensing? I'm just starting to seriously get into this stuff, so I'm still getting a little confused by some of the technical stuff.

Thanks much! :smile:


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You can turn your back on a person, but never turn your back on a drug, especially when its waving a razor sharp hunting knife in your eye.
Hunter S. Thompson

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Re: CCNA Question about cat5 cabling [Re: wiggles]
    #7170043 -

> Ahhhh ok, so is that why a lot of ports on switches and routers are auto-sensing?

Exactly... saves a lot of problems. In the early days, you had to use the correct cable (cross or patch). Then they started putting a button on one of the ports to switch it between MDI and MDIX. Now they typically use autosense on all the ports. To make it even more confusing, there is also autosense with respect to duplex being half or full.


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Just another spore in the wind.

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Re: CCNA Question about cat5 cabling [Re: Seuss]
    #7170051 -

Yeah, I remember reading about that when they were describing the differences between 10base-T and Fast Ethernet.

Are you certified? I may have some more questions for you as I progress through this. I can't afford the college courses so I'm going the self-study route. Luckily my company is excited for me to get the cert, and we have plenty of routers and switches around for me to play with. I'm just kind of under fire because I have to be able to deploy a secure VPN using a 3845 router by the 27th, so I've been trying to grill through this as fast as possible.


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You can turn your back on a person, but never turn your back on a drug, especially when its waving a razor sharp hunting knife in your eye.
Hunter S. Thompson

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Re: CCNA Question about cat5 cabling [Re: wiggles]
    #7170066 -

> Are you certified?

Certifiable... I've been certified in the past, but didn't keep up with my retesting, so it has expired. However, there are a few people that post in here that are current... and a lot of very smart technical folks that can answer basic networking questions.

> I have to be able to deploy a secure VPN using a 3845 router by the 27th

Ouch. Not impossible, but if you want to understand what it is that you are doing, you have a lot of work/study ahead of you.


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Just another spore in the wind.

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Re: CCNA Question about cat5 cabling [Re: Seuss]
    #7170116 -

Yeah, i'm a little nervous about it. I used to do minor networking stuff back at my old job, but I don't think it has me anywhere near prepared for the depth of knowledge that I'm going to need.

Oh well, I'm gonna keep pounding away at this, I mean, I've only got about 900 more pages of technical reading to go, lol.


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You can turn your back on a person, but never turn your back on a drug, especially when its waving a razor sharp hunting knife in your eye.
Hunter S. Thompson

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Re: CCNA Question about cat5 cabling [Re: wiggles]
    #7195148 -

I got my CCNA and I don't remember any questions like that.

:shrug:


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