Q1. What is the IEEE Ethernet specification for 100BaseT?  

                    A.  802.5

                    B.  802.3z

                    C.  802.2

                    D.  802.3u  

Ans: D

Explanation:

100BaseT:

802.3u has been developed by IEEE and provide speeds of 100MBPS over UTP and fiber cabling. 100BaseT uses CSMA/CD and runs on Cat3, 4, and 5 UTP cable. 100BaseT uses 4B/5B encoding.

100BaseTX :

Cabling: Cat 5 UTP cabling or Cat1 STP

Connectors: RJ 45

Coding: 4B/5BNRZ. 

100Base T4:

Cabling: Cat 3,4, or 5 UTP cabling

Connectors: RJ-45

Coding: 8B/6T

100Base FX:

Cabling: Two strands of multi-mode  or single mode fiber cabling

Connectors: MIC, ST, or SC fiber connectors

Coding: 4B/5B