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Network+ N10-007 > Network Models > Flashcards

Network Models Flashcards

1
Q

What does OSI stand for?

A

Open Systems Interconnection

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2
Q

What does TCP/IP stand for?

A

Transmission Control Protocol/Internet Protocol

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3
Q

What is ISO?

A

International Organization for Standardization - created the OSI Seven Layer Model

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4
Q

What are Protocols?

A

Sets of clearly defined rules,regulations, standards and procedures that enable hardware and software developers to make devices and applications that function properly at a particular level

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5
Q

What are the OSI Seven Layers?

A 
Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical
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6
Q

What is a UTP?

A

Unshielded Twisted Pair - usually contains 4 pairs of wires that can transmit and receive data

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7
Q

What OSI Layer are the cabling and central box a part of?

A

Layer 1 - Physical Layer

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8
Q

What layer of the OSI model are copper cabling, fiber optics and radio waves?

A

Layer 1 - Physical Layer

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9
Q

What is a NIC?

A

Network Interface Card - serves as the interface between the PC and the network

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10
Q

Where can you find the NIC?

A

Built into the motherboard

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11
Q

What is a MAC address?

A

Media Access Control address - unique identifier with a 48-bit value

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12
Q

What do the first 6 digits of a MAC address represent?

A

The number of the NIC manufacturer

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13
Q

What do the last six digits of a MAC address represent?

A

Manufacturer’s unique serial number for that particular NIC ( also known as the Device ID)

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14
Q

What does OUI stand for?

A

Organizationally Unique Identifier

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15
Q

What is the Windows command prompt to see the MAC address for your NIC?

A

ipconfig all/

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16
Q

What is the MacOS command prompt to see the MAC address for your NIC?

A

ifconfig

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17
Q

What is the Linux command prompt to see the MAC address for your NIC?

A

ip a

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18
Q

What does EUI stand for?

A

Extended Unique Identifier

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19
Q

What is an oscilloscope?

A

Powerful tool that enables you to see electrical pulses

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20
Q

What is a frame?

A

Basically a container for a chunk of data moving across a network

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21
Q

What is a PDU?

A

Protocol Data Unit - unit of data specified by a protocol at each layer of the OSI model

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22
Q

What is Ethernet?

A

Most common wired network technology

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23
Q

What is a type field?

A

Indicates what’s encapsulated in the frame

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24
Q

What is the data field of a frame?

A

Contains what is encapsulated in the frame

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25
Q

What is FCS?

A

Frame Checking Sequence - special bit of checking information

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26
Q

What is CRC?

A

Cyclic Redundancy Check - type of binary math used by the receiving NIC to verify that the data arrived intact

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27
Q

What do switches do?

A

Filter traffic by MAC address

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28
Q

How long are FCS’s?

A

4 bytes long

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29
Q

What happens if a NIC sends a frame using the broadcast address?

A

Every single NIC on the network will process that frame

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30
Q

What is a unicast frame?

A

Any frame addressed specifically to another devices MAC address

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31
Q

What is the LLC?

A

Logical Link Control -

  1. talks to the systems operating system(usually via device drivers)
  2. Handles multiple network protocols and provides flow control
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32
Q

What layer of the OSI model is the only layer with sub-layers?

A

Layer 2 - Data Link

33
Q

What is MAC?

A

Media Access Control -

A sub-layer of Layer 2 of the OSI model

34
Q

What does the MAC sublayer do?

A
  1. Adds the NIC’s own MAC address
  2. Attaches MAC addresses to the frames
  3. Adds or checks the FCS
  4. Ensures frames are sent along the network cabling
35
Q

What layer of the OSI model do Network cards operate at?

A

Both Layer 2 and Layer 1

36
Q

What is a simple network?

A

Network in which all the computers connect to one switch

37
Q

What are subnets?

A

Smaller networks that were broken down from large networks

38
Q

What does a network protocol do?

A
  1. Creates unique identifier for each system

2. Creates set of communication rules for issues

39
Q

MAC addresses are also known as ________.

A

Physical addresses

40
Q

What is a protocol suite?

A

Several network protocols designed to work together

41
Q

What is the primary logical addressing protocol for TCP/IP?

A

The Internet Protocol(IP)

42
Q

What does the IP do?

A

Makes sure that a piece of data gets to where it needs to go on a network

43
Q

What is an IP address?

A

A unique numeric identifier given to a device by the IP

44
Q

IP address is also known as the _______.

A

Logical address

45
Q

What is a router?

A

Connects subnets

46
Q

How do routers forward data?

A

IP address

47
Q

Where is the MAC address located?

A

Literally burned into the chips on the NIC

48
Q

Where can the IP address be found?

A

Stored in the system’s software

49
Q

What is Layer 1 of the OSI model?

A

Physical layer

50
Q

What is Layer 2 of the OSI model?

A

Data Link layer

51
Q

What is Layer 3 of the OSI model?

A

Network layer

52
Q

What is layer 4 of the OSI model?

A

Transport layer

53
Q

What is Layer 5 of the OSI model?

A

Session layer

54
Q

What is Layer 6 of the OSI model?

A

Presentation layer

55
Q

What is Layer 7 of the OSI model?

A

Application layer

56
Q

What happens at Layer 4(Transport Layer)?

A
  1. Segmentation/reassembly

2. Initializes requests for packets that weren’t revived in good order

57
Q

What does session software do?

A

Handles connecting applications to applications

58
Q

What happens at Layer 5(Session layer)?

A

Initiated sessions, accepts incoming sessions and opens and closes existing sessions

59
Q

What happens at Layer 6(Presentation Layer)?

A

Translation of data from lower layers into a format usable by the Application layer, and vice versa

60
Q

At what layer of the OSI model is a Hub found?

A

Layer 1 - Physical

61
Q

At what layer of the OSI model is a router found?

A

Layer 3 - Network

62
Q

What is encapsulation?

A

Entire process of preparing data to go onto a network

63
Q

What is de-encapsulation?

A

Reverse process of encapsulation

64
Q

How many layers does the TCP/IP model have?

65
Q

What are the TCP/IP layers?

A

Application
Transport
Internet
Link/Network Interface

66
Q

What happens in the Internet Layer of the TCP/IP model?

A
  1. IP addressing

2. Creation of IP packets

67
Q

What happens at the Transport Layer of the TCP/IP model?

A

Segmentation and reassembly of data

68
Q

What is IMAP?

A

Internet Message Access Protocol - used for sending e-mail messages

69
Q

What is UDP?

A

User Datagram Protocol - connectionless protocol

70
Q

In logical terms, what is a port?

A
  1. Number between 1 and 65,536

2. Logical value assigned to specific applications or services

71
Q

Where does a hub send data?

A

To all the systems connected to the hub

72
Q

What uniquely identifies every NIC?

A

Media Access control address

73
Q

A NIC sends data in discrete chunks called ____.

74
Q

Which MAC address begins a frame?

A

Receiving system

75
Q

A frame ends with a special bit called the frame check sequence(FCS). What does the FCS do?

A

Verified that the data arrived correctly

76
Q 
Which of the following is an example of a MAC address?
A. 0-255
B. 00-50-56-A3-04-0C
C. SBY3M7
D. 192.168.4.13
A

B. 00-50-56-A3-04-0C

77
Q

Which layer of the TCP/IP model controls the segmentation and reassembly of data?

A

Transport layer

78
Q

Which layer of the OSI model keeps track of a system’s connections to send the right response to the right computer?

A

Session layer

Network+ N10-007 (3 decks)

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