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Network+ > Network Models > Flashcards

Network Models Flashcards

Explain functions and application of various network devices.

1
Q

Layer 1

A

Physical

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2
Q

Layer 2

A

Data Link

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3
Q

Layer 3

A

Network

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4
Q

Layer 4

A

Transport

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5
Q

Layer 5

A

Session

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6
Q

Layer 6

A

Presentation

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7
Q

Layer 7

A

Apllication

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8
Q

Unshielded Twisted Pair(UTP)

A

Cable for telephone and network composed of pairs of wires twisted around each other at specific interval. Twist reduce interference. More twist less interference

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9
Q

Physical Layer

A

Anything that moves data from one system to another

Defines hardware connections and turns binary into physical pulses.

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10
Q

What operates at the Physical Layer?

A

Repeaters, hubs, cabling, fiber optics, and radio waves

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11
Q

NIC

A

Allows a PC to link physically to a network

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12
Q

MAC Address

A

Unique 48-bit address assigned to NIC’s

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13
Q

Organizationally Unique Identifier (OUI)

A

First 24 bits of a MAC address, assigned to the NIC manufacturer by the IEEE

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14
Q

What are the last 6 digits of a MAC address?

A

Device ID

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15
Q

Physical Address

A

Address burned into a ROM chip on a NIC

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16
Q

Example of Physical Address

A

MAC

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17
Q

A defined series of binary data that is the basic container for a discrete amount of data moving across a network

A

Frame

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18
Q

A sequence of bits placed in a frame that is used to check the primary data for errors

A

Frame Check Sequence (FCS)

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19
Q

A mathematical method used to check for errors in long streams of transmitted data with high accuracy

A

Cyclic Redundancy Check (CRC)

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20
Q

An electronic device that sits at the center of a star topology network, providing a common point for connection of network devices.

A

Hub

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21
Q

The address a NIC attaches to a frame when it wants every other NIC on the network to read it

A

Broadcast Address

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22
Q

255.255.255.255

A

General Broadcast Address

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23
Q

FF-FF-FF-FF-FF-FF

A

Broadcast MAC Address

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24
Q

Data Link Layer

A

Any device that deals with a MAC Address

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25
Q

What filters and forward frames based on MAC address and operates on the Data Link Laye?

A

Bridges

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26
Q

A device that connects two networks and passes traffic between them based only on the node address, so that traffic between nodes on one network does not appear on the other network. Ex. Ethernet bridge only looks a the MAC address.

A

Bridge

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27
Q

What are the two aspects of NIC’s

A

Logical Link Control (LLC) and Media Access Control (MAC)

28
Q

The aspect of the NIC that talks to the OS, places outbound data coming “down” from the upper layers of software into frames and create the FCS on each frame

A

Logical Link Control (LLC)

29
Q

Which layer on the OSI model has sublayers?

A

Data Link

30
Q

The process of assigning organized blocks of logically associated network addresses to create smaller manageable networks called subnets

A

Logical Addressing

31
Q

Example of logically addressing

A

IP Addresses

32
Q

Subnet

A

Each independent network in a TCP/IP internetwork

33
Q

Special software that exists in every network-capable OS that acts to create unique identifiers for each system. It also creates a set of communication rules for issues like how to handle data chipped up into multiple packets and how to deal with routers.

A

Network Protocol

34
Q

A set of protocols that are commonly used together and operate at different levels of the OSI seven layer model

A

Protocol Suite

35
Q

Basic component of communication over a network. A group of bits of fixed maximum size and well-defined format that is switched and transmitted as a complete whole through a network. It contains source and destination address, data, and control information

A

Packet

36
Q

A device that connects separate networks and forwards a packet from one network to another based only on the network address for the protocol being used.

A

Router

37
Q

What operates on Layer 3?

A

Routers

38
Q

Which layer is the last to deal directly with hardware?

A

Network Layer (Layer 3)

39
Q

Assembly/disassembly and also initializes requests for packets that weren’t received in good order

A

Transport Layer (Layer 4)

40
Q

TCP, UDP, SPX, and NetBEUI operates at which Layer?

A

Transport Layer

41
Q

The Transport Layer break data down into which kind of chucks?

A

Segments or Datagrams

42
Q

Manages connections between machines (initiates sessions, accepts incoming sessions, and open and close existing sessions

A

Session Layer (Layer 5)

43
Q

NetBIOS and Sockets operate at which layer

A

Session Layer

44
Q

Handles the process of differentiating among various types of connections on a PC (connecting applications to applications)

A

Session Software

45
Q

Which two encryptions protocols used in ecommerce are initiated at Layer 5

A

TLS and SSL

46
Q

TLS and SSL are encrypted and decrypted at which Layer

A

Layer 6

47
Q

Which layer manages data encryption, hides the difference among various types of computer systems (Data conversion)

A

Presentation Layer (Layer 6)

48
Q

Provides tools for programs to use to access the network

A

Application Layer (Layer 7)

49
Q

HTTP, FTP, SMTP, and POP3 are all examples of protocols that operate at which layer?

A

Application Layer

50
Q

Shared functions, subroutines, and libraries that allow programs on a machine to communicate with the OS and other programs

A

Application Programming Interface (API)

51
Q

The process of stripping all the extra header information from a packet as the data moves up a protocol stack

A

De-encapsulation

52
Q

The process of putting the packets from one protocol inside the packets of another protocol. Ex. Application to Data Link layers. Each layer adds more information so that the data get to the correct recipient and the recipient knows what to do with the data.

A

Encapsulation

53
Q

Where dos a hub send data?

A

To all the systems connected to the hub

54
Q

What uniquely identifies every NIC?

A

Media access control address (MAC Address)

55
Q

What Windows utility do you use to find the MAC address for a system?

A

ipconfig /all

56
Q

A MAC address is known as a(n) ____ address

A

Physical

57
Q

A NIC sends data is secrete chunks called _____

A

Frames – Network use frames to keep any one NIC from hogging the wire

58
Q

Which MAC address begins a frame?

A

Receiving system – followed by the MAC address of the sending NIC – followed, in turn, by type of encapsulated data, the data, and FCS

59
Q

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

A

Verifies that the data arrived correct

60
Q

00-50-56-A3-04-0C is an example of

A

MAC address

61
Q

Which layer of the TCP/IP model controls the assembly and disassembly of data?

A

Transport Layer

62
Q

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

A

Session

63
Q

Name TCP/IP four layers

A

Application, Transport, Internet, Link/Network Interface

64
Q

Makes up the OSI model’s Layer 1 and 2

A

Link Layer

65
Q

Any device or protocol that deals with pure IP packets –getting an OP packet–getting an IP packet to its destination

A

Internet Layer

66
Q

Which layer is compared to OSI Layers 4,5, and part 7

A

Transport Layer

67
Q

Which layer is compared to OSI Layer 5-7

A

Application Layer

Network+ (3 decks)

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