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5-4-3-2-1 rules for Hub connections ???

DVNT1
DVNT1 asked
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I think I understand the connectivity rule with Ethernet: 10Base2, 10Base5 and 10Base-T...

There are only maximum 5 segments between any two terminal nodes.
There are only maximum 4 repeaters between any two terminal nodes.
There are only three segments could be used to connect nodes.
There are two inter-hub segments could not be used to connect nodes.
There forms one collision domain that could contain maximum 1024 nodes.

How does this apply with Class I and Class II Repeaters and switches along with 100 base-TX? Is there even another newer class?  Are the rules the same?
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Suppose we talk about copper only (UTP)
Class I repeaters you cannot cascade (or daisychain)so
PC -- 100m UTP -- class I rep --100m UTP -- PC
Class II repeaters you can connect two but your network diameter may not be larger than 205m so
PC --100m UTP--Class II--5m UTP--Class II--100m UTP--PC

Switches are a different story: since they can work full duplex collisions do no longer play. You can for instance cascade 7 switches or even more. The rule in IEEE 802.1D
(spanning tree) states that you cannot have more than 7 switches in a ring topology.
Have a look here:
http://wwwhost.ots.utexas.edu/ethernet/100quickref/ch10qr_2.ht
Cisco also has some good info:
http://www.cisco.com/univercd/cc/td/doc/product/fhubs/fh300icg/rptrnetc.htm
enjoy
contrazoom

Commented:
Keep in mind that 5-4-3 was originally a rule of thumb for dealing with 10Base2 networks.  Given the amount of variance in bit times with 100/1000 megabit Ethernets, as well as the difference in propagation with TP and fiber versus coax, the rule's practical use degrades rapidly.  

If you throw a bridge/switch port (...and a dual-speed hub generally includes a bridge - if you traverse the two speeds, of course) then you can pretty much keep cascading.
Les MooreSr. Systems Engineer
BRONZE EXPERT
Top Expert 2008

Commented:
No comment has been added lately. It appears this question has been abandonded so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:

I recommend: points to contrazoom

if there is any objection or other expert commentary to this recommendation then please post in here within 7 days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

thanks,
lrmoore
EE Cleanup Volunteer
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Author

Commented:
I don't feel there was a clear answer given but contrazoom was still helpful.

Thank for both replies.