Ethernet

Question 1

The OUI of an Ethernet address is assigned by who?

Answer 1

IEEE

Question 2

Which bit in the MACaddress signifies if the destination MAC address is unicast or multi/broadcast?

Answer 2

The Individual Group (I/G) bit

Question 3

Which bit in the MAC address signifies if the MAC is burned in or has been changed?

Answer 3

Local/Global bit.

Question 4

How do 802.3 and Ethernet II frames differ?

Answer 4

Ethernet II has a type field whereas 802.3 has a length field

Question 5

Which IEEE standard defines a convergent digital home network for both wireless and wired technologies?

Answer 5

IEEE 1905.1-2013

Question 6

What is BPL and what IEEE standard defines it?

Answer 6

Broadband Powerline Networking. IEEE 1901

Question 7

What two IEEE specifications cover Power over Ethernet?s

Answer 7

802.3af and 802.3at

Question 8

What is PoE+ also known as? What power output can it support up to?

Answer 8

802. 3at

25. 5W

Question 9

which body governs the physical layer specifications for Ethernet?

Answer 9

EIA/TIA

Question 10

List in order the Ethernet fields

Answer 10

1) preamble
2) start of frame/synch
3) destination
4) source
5) length/type
6) data
7) FRC

Question 11

Which ethernet specification cannot by itself identify upper layer protocols and requires to be used alongside a proprietary LAN protocol?

Answer 11

802.3

Question 12

CSMA/CA is a contention used by wireless and what other topology?

Answer 12

Token Ring

Question 13

PoE 802.3af outputs at what power level?

Answer 13

15.4W

Question 14

What devices are associated with a) multiport repeater, b) multiport bridge

Answer 14

A hub is a multiport repeater

A switch is a multiport bridge

Question 15

List the 2 steps that occur in CSMA/CD after two nodes try to transmit at the same time and a collission occurs?

Answer 15

1) both nodes transmit a jam signal (which all nodes hear)

3) all nodes run the back-off algorithm to create a random timer to wait before retransmitting