Pop Quiz for Network Champs

Alteon · Post by **Alteon** » Thu Apr 05, 2001 1:12 am

Real quick question. i wanted to know if anyone can answer this. The minimum frame ethernet can send is 64 bytes(octets). Why is this? 2 hints. it has to do with the CD in CSMA/CD. And the old 10Base5 ethernet's 5-4-3 rule. If you think im insane thats ok. my boss asked me this and i figured it out with pen a paper and some simple algebra. i didnt get those hints either just wondering who else knows.

AmdAce · Post by **AmdAce** » Thu Apr 05, 2001 10:12 am

I believe the answer to this question has to do with timing. By setting a minimum frame size in the original 802.3 spec, the frame would have a chance to make it through the whole network (limited in size by 5-4-3 rule) thereby avoiding collisions. But I could be wrong. I think I'll do some research on this one.

Alteon · Post by **Alteon** » Thu Apr 05, 2001 7:33 pm

very close. it does have to with the propagation on the signal down the line. think of the worst case scenario and thats why its 64bytes.

gmcd33 · Post by **gmcd33** » Fri Apr 06, 2001 7:54 pm

Um, It needs to be that big for Colision Dectection to detect a collision????????

youbecha · Post by **youbecha** » Sat Apr 07, 2001 11:54 pm