Cisco CCNA, CCENT, And CCNP Household Lab Study: The DTE DCE Cable

Part of putting your own Cisco home lab stable is getting the prerrogative cables for the job! In this instalment of this exclusive Cisco habitation lab tutorial series, learn how and when to use DTE/DCE cables in your at rest network.

More Cisco CCNA, CCENT, and CCNP candidates than ever before are putting calm their own home labs for their certification exam study, and that's a great trend - there's nothing like learning on the bona fide thing!

Part of putting a native lab well-adjusted is getting the right cables and understanding their usage. In this new Cisco territory lab series, we'll take a glom at the different cable types and how everyone fits into your home lab. The first cable type we'll look at is the multi-purpose DTE/DCE cable.

When I say "multi-purpose", I mean that while the cable testament always perform the corresponding task, it can be used in several contrasting points in your home lab network. If you're going to corner a frame relay switch - and you should get one if at all possible, since having your own frame relay cloud is a tremendous boost to your home lab studies and your exam score - you're going to need a DTE/DCE cable.

You can also use a DTE/DCE cable to directly connect two Cisco router serial interfaces and configure HDLC (the default) or PPP encapsulation over that point-to-point link.

Most of today's DTE/DCE cables annex "DTE" clearly stamped on one end of the cable - actually, "DTE" is probably embedded into the connector itself. Naturally, the other end will have "DCE" clearly indicated. It's the DCE end that will connect to your frame relay switch. If you're going to use a administer connexion to flight PPP or HDLC, it nearly doesn't matter which end of the cable is connected to a given router.

Keyword: "almost". You must use the clockrate command on the DCE end of the connection in order to bring the contour protocol up.

If you're not persuaded which bound of your DTE/DCE cable is connected to a disposed serial interface, just use the show controller serial command to impress that information. Most of the output of that command isn't comprehensible, but what we need is hold water on top:

R3#show controller serial 1

HD unit 1, idb = 0x11B4DC, driver structure at 0x121868

buffer bigness 1524 HD unit 1, V.35 DCE cable

Naturally, if it's the DTE end, you'll behold "DTE" there. And whether you don't have anything connected to that interface, you'll see "no cable".

Whether you have your own frame relay switch or not, you'll want to pick up some DTE/DCE cables for direct connections between your Cisco home lab router's serial interfaces. Ethical don't forget to assign the clockrate command on the DCE end of the cable! And if you're not familiar with a frame relay switch, check this same website soon for a tutorial that will show you how to set one up.

Just about any Cisco router can serve as a home lab frame relay switch, and once you've got it configured , you're in acceptable shape - nevertheless it can be a cramped maddening to influence it up and running in the first place. I'll show you how to avoid that aggravation in the later installment of this Cisco home lab tutorial series!

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01 Dec 2008 18:29:14

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