At 12:37 AM 7/25/00, Mohammed Hakim wrote:
>Hello group,
>
>I have some questions if anyone can help me .. and Thanks :)
>
>1) In the ICRC Cisco book .. at page 47 (The Ethernet/802.3 ..) 100BaseT4
>is a 100-Mbps .. of Ethernet using four-pair Category 3,4 or 5 cabling.
>But in the Internetworking Technologies Handbook (Second Edition) at page
>103 (100BaseT4) .. run over existing Category 3 wiring, .. four pairs of
>cabling .. uses the half-duplex 4T + signalling scheme.
>What is the Correct support cables category 3 only or 3, 4 or 5.
Per the IEEE 802.3u specification, 100BaseT4 signaling requires four pairs
of Category 3 or better cable. So you could run it on Cat 4 or 5, but
that's not really what it was intended for. It was aimed at users who
wanted 100 Mbps performance, but still had Cat 3 cabling. Users that have
Cat 5 cabling would have no reason to run 100BaseT4. They could run
100BaseTX over two pairs of Cat 5 cabling.
>
>2) what is the 100BaseT2 ?? (It use Category 3,4 or 5 UTP)
The specification doesn't actually use the term "100BaseT2." It uses the
term 100BaseTX and defines that as "Specification for 100 Mbps CSMA/CD LAN
over two pairs of Category 5 UTP or shielded twisted-paid (STP) wire."
>
>3) Does the Token Ring (IEEE 802.5) support Multicasts (sending packets to
>a group of devices) in some book I red that Multicasts is supported on an
>Ethernet or FDDI LAN (not allowed on Token Ring) but broadcast is allowed
>on all LAN types. Take a note the in the ICRC cisco book page 59 (Token
>Ring supports broadcasting and multicasting .. Multicasting is used to
>send packets to special ...etc)
>Any Help Please .. I am confuse
There was an issue many years ago whereby the Token Ring chipsets from IBM
didn't support multicasting. (They only supported functional addresses.)
That problem was fixed years ago, but I could imagine it is still mentioned
in some books.
>
>4) Is the Switch is faster then the Bridge .. Why??
Yes, a switch is generally much faster than a bridge because of the use of
customized ASICs and other advances made in hardware since bridges were
first produced. See the groupstudy archives for more details.
>
>5) Is the IP Datagram header are important (Ex: VERS, HLEN ... etc)
Yes. I assume you mean is it important for the test? I think the answer is
still yes, but you probably just need a very broad understanding of the
fields in the header.
Good luck on the test.
Priscilla
>
>I hope I can make it in the 640-407 exam before it retire. I think some
>diffrence between 640-407 & 640-507 that the passing score is 755
>(640-407) and 822 (640-507) any idea .. i hope it does not be 850 !!!
>
>Thanks .. :)
>
>Mohammed Hakim
>
>
________________________
Priscilla Oppenheimer
http://www.priscilla.com
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