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Google IT Cert: Course 2 > Bits & Bytes: Week 1, V - the Data Link Layer > Flashcards

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

1
Q

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

A

Ethernet

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2
Q

ACRONYM:

CSMA/CD

A

Carrier Sense Multiple Access with Collision Detection

acronym

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3
Q

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

A

Carrier Sense Multiple Access with Collision Detection

definition

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4
Q

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

A

A collision domain

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5
Q

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

A

A MAC Address

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6
Q

A way to represent numbers using 16 digits

A

Hexadecimal

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7
Q

What is 10 in hexadecimal numbers?

A

A

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8
Q

What is 11 in hexadecimal numbers?

A

B

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9
Q

What are 12 and 15 in hexadecimal numbers?

A

C and F, respectively

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10
Q

What are 13 and 14 in hexadecimal numbers?

A

D and E, respectively

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11
Q

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

A

An Octet

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12
Q

ACRONYM:

OUI

A

Organizationally Unique Identifier

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13
Q

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

A

They are assigned to individual hardware manufacturers.

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

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14
Q

ACRONYM:

IEEE

A

Institute of Electrical and Electronics Engineers

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15
Q

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

A

Ethernet; MAC

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16
Q

When one device transmits data to exactly one other device

A

A Unicast Transmission

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17
Q

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

A

A Multicast Transmission

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18
Q

When one device sends data to all devices on a LAN

A

A Broadcast Transmission

19
Q

What is the Ethernet broadcast address?

A

FF:FF:FF:FF:FF:FF

20
Q

What is the term for an Ethernet Data Packet?

A

Ethernet Frame

21
Q

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

A

Definition of an Ethernet Frame

22
Q

The first part of an Ethernet frame

A

Preamble

23
Q

How long is a preamble?

A

8 bytes (64 bits)

24
Q

ACRONYM:

SFD

A

Start Frame Delimiter

acronym

25
Q

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

A

Start Frame Delimiter

location and size

26
Q

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

A

Start Frame Delimiter

purpose

27
Q

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

A

the Destination Address

location in an ethernet frame

28
Q

What part of the Ethernet frame follows the Destination Address?

A

The Source Address

location in an ethernet frame

29
Q

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

A

The VLAN Header

location in an ethernet frame

30
Q

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

A

The EtherType Field

location in an ethernet frame

31
Q

ACRONYM:

VLAN

A

Virtual Local Area Network

acronym

32
Q

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

A

VLAN; or Virtual Local Area Network

use of

33
Q

What part of the Ethernet frame follows the EtherType Field?

A

The Payload

location in an ethernet frame

34
Q

The data intended to be transmitted via the Ethernet Frame

A

The Payload

definition

35
Q

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

A

46 to 1500 bytes

size of ethernet payload

36
Q

What part if the Ethernet Frame follows the Payload?

A

The Frame Check Sequence

location in Ethernet frame

37
Q

ACRONYM:

FCS

A

Frame Check Sequence

acronym

38
Q

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

A

Frame Check Sequence

definition

39
Q

ACRONYM:

CRC

A

Cyclical Redundancy Check

acronym

40
Q

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

A

Checksum Value

use

41
Q

A calculation used to find the Checksum Value

A

Cyclical Redundancy Check

definition

42
Q

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?

A

The data has been corrupted during transmission process.

43
Q

What happens to data that fails the Cyclical Redundancy Check?

A

It’s discarded

Google IT Cert: Course 2 (14 decks)

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