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Now for whom lab you can actually build a point to point serial link without A C issue D issue.

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So in the real world you would connect the DTC side of the cable to the router and the DCs side of the

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cable to a C issue D issue but for home labs you can actually use a back to back serial cable.

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So in the real world you would connect the DTV side of the cable to the router and the DC side to this

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issue the issue but a back to back cable has a DC side and DTV side and has connectors that allow you

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to directly attach to routers to each other.

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So this provides a back to back cable the cable side determines whether you have the DTV or DC side

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connected to the router.

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So internally the cable is crossing the connection in a similar way to a crossover cable anything at

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the command show controllers serial and your serial interface number will allow you to determine whether

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you have the DC side or DTC side of the cable.

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And I'll demonstrate that in a moment.

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So for the real world they are different types of cables.

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You have what are called thirty five cables.

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Here's an example of a 35 DTV cable which is the male side of the connector.

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You could connect a cable to a cable to create to the back to back connection but it's easier these

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days just to buy pre-built tabac cables.

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Here's an example of a 21 female DC cable and DTG male connector.

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What you'll notice is that the male side is the key and the female side is the DC.

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Here's an example of an EIA TR 83 to cable both DC and DTV as well as EIA T.I. a 4 4 9 DC and DTV.

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Once again in a lab you probably just want to connect the devices using a pre-built back to back cable

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and you can buy these from E-bay as an example.