I came across the following approach while preparing for my CCIE written.
Both BOSON and CertificationZone practice tests used questions centered
around this approach, and I found it useful in studying protocol behavior.
Draw out an environment kinda like the following:
Host----medium----device-------medium--------device--------medium----device-
-----medium-----host
Medium = ethernet, token ring, FDDI, frame relay, T1, OC3, ATM
Device = router, bridge, switch
Put as many media segments and devices as you want
Data needs to go from host to host. Substitute in various specifics for
medium and device.
Ask yourself what protocols have to be in place, and where.
Ask yourself about source and destination MACs from various places within
the chain.
Ask yourself about source and destination Ips
If the media on either side of a device is token ring, for example, what can
the device be?
If one side is ethernet and the other FDDI, what can the device be?
I'm sure you all can come up with even more complications and examples.
For even more fun, make the drawing three dimensional ( multiple devices
hanging off the various media segments )
You can have a lot of fun with this, and also practice visualizing what
happens as data is moved from here to there. As I said, I saw examples like
this from both BOSON and CertZone, and I found it useful in practicing
protocol behavior recognition.
Chuck
----------------------
I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life as
it has been is over ( if you hope to pass ) From this time forward, you will
study US!
( apologies to the folks at Star Trek TNG )
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