1.3 Introduction to Ethernet

Question 1

The MA in CSMA/CD stands for ______________, and it means that there’s more than one device that is on this particular network.

Answer 1

multiple access

Question 2

Wireless networks use ______________ to avoid collisions.

Answer 2

CSMA/CA

Question 3

Following the Payload of an Ethernet frame is the ___________________.

Answer 3

FCS (Frame Check Sequence)

Question 4

The CA in CSMA/CA stands for ______________.

Answer 4

collision avoidance

Question 5

Collision detectin isn’t possible in Wireless networks because a sending statiion cannot ______________ other stations.

Answer 5

hear

Question 6

The _________________ leads the Ethernet frame, it is 56 bits of alternating 1’s and 0’s.

Answer 6

Preamble

Question 7

Wireless devices use _____________ to communicate with the access point to avoid collision avoidance. This solves the “hidden node” problem, where two devices can only communicate via the access point.

Answer 7

RTS/CTS (ready to send, clear to send)

Question 8

The sixth section of an Ethernet frame is the ___________________.

Answer 8

Payload

Question 9

The third section of an Ethernet frame is the _________________.

Answer 9

Destination MAC address

Question 10

The second three bytes of a MAC address is the ______________.

Answer 10

Network Interface (Controller-specific identifier) unique to your NIC.

Question 11

The CD in CSMA/CD stands for ______________, that means if two devices do communicate simultaneously and that information does collide, those devices will recognize that a collision has occurred and try to communicate that traffic again.

Answer 11

collision detect

Question 12

The first three bytes of a MAC address is the ______________.

Answer 12

Organizationally Unique Identifier (OUI) the manufacturer ID

Question 13

The CS in CSMA/CD stands for ______________. This means that your Ethernet adaptor is going to listen to see if there’s a carrier that’s available that ic can use to send a frame of data out to the network.

Answer 13

carrier sense

Question 14

The type of half-duplex communication that in the event of a collision every device knows that a collision has taken place, and they all wait a random amount of time to send that data again, is called ______________.

Answer 14

CSMA/CD

Question 15

The fourth section of an Ethernet frame is the _________________.

Answer 15

Source MAC address

Question 16

The second section of an Ethernet frame is the _________________ which designates the end of the preamble. It is always 10101011.

Answer 16

SFD (Start Frame Delimiter)

Question 17

The fifth section of the Ethernet frame is the ___________________ which describes the data contained in the payload.

Answer 17

EtherType (IPv4 or IPv6)