CCNA (Some help)

[Mohammed Hakim]

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.   2) what is the 100BaseT2 ?? (It use Category 3,4 or 5 UTP)   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   4) Is the Switch is faster then the Bridge .. Why??   5) Is the IP Datagram header are important (Ex: VERS, HLEN ... etc)   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