Bits & Bytes: Week 1, V - the Data Link Layer

Question 1

What is the most type of network used in the workplace and data centers?

Answer 1

Ethernet

Question 2

ACRONYM:

CSMA/CD

Answer 2

Carrier Sense Multiple Access with Collision Detection

acronym

Question 3

A technique used to determine when communications channels are clear, and a device is free to transmit data

Answer 3

Carrier Sense Multiple Access with Collision Detection

definition

Question 4

A network segment where all devices receive all communication across the entire segment.

Answer 4

A collision domain

Question 5

A 48-bit number normally represented by six groupings of two hexadecimal numbers

Answer 5

A MAC Address

Question 6

A way to represent numbers using 16 digits

Answer 6

Hexadecimal

Question 7

What is 10 in hexadecimal numbers?

Answer 7

A

Question 8

What is 11 in hexadecimal numbers?

Answer 8

B

Question 9

What are 12 and 15 in hexadecimal numbers?

Answer 9

C and F, respectively

Question 10

What are 13 and 14 in hexadecimal numbers?

Answer 10

D and E, respectively

Question 11

What is a computer networking term for any number that can be represented by 8 bits?

Answer 11

An Octet

Question 12

ACRONYM:

OUI

Answer 12

Organizationally Unique Identifier

Question 13

What do the first 3 octets of a MAC address represent?

Answer 13

They are assigned to individual hardware manufacturers.

This means that you can identify who makes a device using just its MAC number.

Question 14

ACRONYM:

IEEE

Answer 14

Institute of Electrical and Electronics Engineers

Question 15

__________ uses __________ addresses to ensure that the data it sends has an address for both the sending and receiving devices of a transmission.

Answer 15

Ethernet; MAC

Question 16

When one device transmits data to exactly one other device

Answer 16

A Unicast Transmission

Question 17

When one device transmits to all devices on a local network signal

Answer 17

A Multicast Transmission

Question 18

When one device sends data to all devices on a LAN

Answer 18

A Broadcast Transmission

Question 19

What is the Ethernet broadcast address?

Answer 19

FF:FF:FF:FF:FF:FF

Question 20

What is the term for an Ethernet Data Packet?

Answer 20

Ethernet Frame

Question 21

A highly structured collection of information presented in a specific order in Ethernet protocol

Answer 21

Definition of an Ethernet Frame

Question 22

The first part of an Ethernet frame

Answer 22

Preamble

Question 23

How long is a preamble?

Answer 23

8 bytes (64 bits)

Question 24

ACRONYM:

SFD

Answer 24

Start Frame Delimiter

acronym

Question 25

What is the term for the last byte of the preamble of an ethernet frame?

Answer 25

Start Frame Delimiter | location and size

Question 26

What signals to a receiving device that the preamble is over and that the actual frame contents will now follow?

Answer 26

Start Frame Delimiter | purpose

Question 27

What part of the Ethernet frame follows the Start Frame Delimiter?

Answer 27

the Destination Address | location in an ethernet frame

Question 28

What part of the Ethernet frame follows the Destination Address?

Answer 28

The Source Address | location in an ethernet frame

Question 29

What part of the Ethernet frame often follows the Source address?

Answer 29

The VLAN Header | location in an ethernet frame

Question 30

What part of the Ethernet frame follows the VLAN header, if present, or the Source Address, if no VLAN header?

Answer 30

The EtherType Field | location in an ethernet frame

Question 31

ACRONYM: VLAN

Answer 31

Virtual Local Area Network | acronym

Question 32

This technique allows multiple logical LANS to operate on the same physical equipment.

Answer 32

VLAN; or Virtual Local Area Network | use of

Question 33

What part of the Ethernet frame follows the EtherType Field?

Answer 33

The Payload | location in an ethernet frame

Question 34

The data intended to be transmitted via the Ethernet Frame

Answer 34

The Payload | definition

Question 35

How large is the data payload of a traditional ethernet frame?

Answer 35

46 to 1500 bytes | size of ethernet payload

Question 36

What part if the Ethernet Frame follows the Payload?

Answer 36

The Frame Check Sequence | location in Ethernet frame

Question 37

ACRONYM: FCS

Answer 37

Frame Check Sequence | acronym

Question 38

A 4-byte number that represents a checksum value for the entire Ethernet frame

Answer 38

Frame Check Sequence | definition

Question 39

ACRONYM: CRC

Answer 39

Cyclical Redundancy Check | acronym

Question 40

This number, derived via a Cyclical Redundancy check, should match when calculated before data is sent and when calculated when data is received.

Answer 40

Checksum Value | use

Question 41

A calculation used to find the Checksum Value

Answer 41

Cyclical Redundancy Check | definition

Question 42

What does it mean when the Frame Check Sequence doesn't match the number generated using the Cyclical Redundancy Check upon receipt of the message?

Answer 42

The data has been corrupted during transmission process.

Question 43

What happens to data that fails the Cyclical Redundancy Check?

Answer 43

It's discarded