Ethernet

Question 1

Do wired and wireless client both connect to the LAN using Ethernet?

Answer 1

No. Only the wired clients do.

Question 2

On an Ethernet cross-over cable which pins are not straight through? i.e. what are the pinouts?

Answer 2

1-2 connect to 3-6 at the other end of the cable.

Question 3

Which devices require cross-over cables to connect directly out of these devices? router, switch, hub, WAP, and PC

Answer 3

PC-router, switch-switch and Hub-switch.

Question 4

Ethernet FCS field. How long is it, where is it located, and what is it used for?

Answer 4

The length is 4 bytes, located in the trailer, used for error detection - not correction, only detection.

Question 5

802.11 standards define what?

Answer 5

WLANs

Question 6

802.3 standards define what?

Answer 6

Ethernet.

Question 7

What is auto-mdix?

Answer 7

modern technology that changes logic in devices to allow straight through cables to be used for all devices.

Question 8

How many bytes is a MAC address?

Answer 8

6

Question 9

What are the fields with the number of bytes of each, in order, of an ethernet frame?

Answer 9

Preamble(7),SFD(1), Dest(6), Source(6), Type(2), Data and Padding(46-1500), FCS(4)

Question 10

What is an OUI? and how many bytes is it?

Answer 10

Organizationally Unique Identifier, 3 bytes or 6 hex digits

Question 11

What is the Ethernet broadcast address?

Answer 11

FFFF.FFFF.FFFF

Question 12

What does the Type field do in an ethernet header?

Answer 12

The two byte type defines the L3 protocol that is encapsulated within the frame. (IEEE refers to this as EtherType)