Cisco Sales-certification Exam 646-151

You have two workstations. Each workstation has a 100BASE-T network card. You
want to connect the two workstations 642-091 directly without the use of a hub or switch.
Which cable could you use?

A. Cat3 crossover
B. Cat5 crossover
C. Cat3 straight
D. Cat5 straight
Answer: B
Explanation:
Both workstations' NIC will be physically and electronically the same medium dependent
interface (MDI), therefore, you need a 646-002 crossover cable to connect the two together.
100BASE-T has a transmissions speed of up to 100 Mbps. The minimum twisted-pair,
copper cable that can support these speeds are Cat5 cable.

Incorrect Answers:
A, C:
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Both workstations' NIC will be physically and electronically the same as a medium
dependent interface (MDI), therefore, you need a crossover cable to connect the two
together. 100BASE-T has a 646-003 transmissions speed of up to 100 Mbps. However, Cat3 cable
is rated at only 16 Mbps. The minimum cable rating that can support 100Mbps Cat5
cable.
D: Straight cable can connect a workstation on a 100BASE-TX network to hub, router, or
switch, which would have medium dependent interface-crossover (MDI-X) port.
However, a crossover cable is required to connect two client workstations directly as the
two workstations will 646-151 have similar medium dependent interfaces (MDIs).

References:
David Groth and Dan Newland, A+ Complete Study Guide (2nd Edition), Sybex,
Alameda CA, 2002, pp. 325,327.
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda
CA, 2005, pp. 20-21, 23, 144, 290-292, 436-437