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Network + > Network Models > Flashcards

Network Models Flashcards

1
Q

What is the 7 layer OSI model?

A

Open Systems Interconnection, model is a conceptual framework that divides network communications functions into seven layers that explains how a network works.

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2
Q

What are the 7 layers of the OSI model?

PDNTSPA

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

What is the Physical layer of the OSI model?

A

1st layer, Cabling, network card, getting 1’s and 0’s from one machine to another.

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4
Q

What is the Data Link layer of the OSI model?

A

2nd Layer, Mac Addresses / for NICs and Switches

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5
Q

What is the Network layer of the OSI model?

A

3rd Layer, Logical addresses, TCP/IP and Routers, packets are created

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6
Q

What is the Transport layer of the OSI model?

A

4th Layer, assembles and disassembles data 1500 bytes maximum, sequencing, segments

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7
Q

What is the Session Layer of the OSI Model?

A

5th layer, makes the actual connection to the remote host or other computers, uses Port numbers

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8
Q

What is the Presentation Layer of the OSI Model?

A

6th layer, makes sure that the Data gets to the application, not really important anymore.

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9
Q

What is the Application Layer of the OSI Model?

A

7th Layer, API or Application Program Interface, smart application

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10
Q

How is Data transferred from one device to another?

A

Frames or Packets in chunks of 1’s and 0’s

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11
Q

What is the cornerstone of Networking?

A

Packetized Data

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12
Q

Frames are created and destroyed in what hardware device?

A

Network Card (NIC)

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13
Q

Each hexadecimal character has?

A

4 binary characters ex: ( 40-8d-5c-1c-5a-50 ) = 12x4=48 Bit address

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14
Q

1st 3 - Hexadecimals ( 40-8d-5c ) are known as:

A

OEM identifier

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15
Q

Last 3 - Hexadecimals ( 1c-5a-50 )

A

Unique identifier

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16
Q

CRC stands for what?

A

Cyclic Redundancy Check ( verifies data is good )

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17
Q

All “F’s” address ( FF-FF-FF-FF-FF-FF ) is a :

A

Broadcast domain ( sends to all machines on the network )

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18
Q

Domain that know a one specific mac address is:

A

Unicast domain ( Only sends to one Single Machine )

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19
Q

Logical Address

A

Is considered a Virtual Address, doesn’t physically exist

20
Q

IP addressing

A

The unique identifying number assigned to every device connected to the internet

21
Q

IP Packets never travel by themselves, they are always incapsulated by a:

A

Frame

22
Q

IP Packets never Change but:

A

Frames do

23
Q

Some Port numbers ( ex: 80-1694 ) are unique to applications:

A

80 - Internet or web page ( HTTP )
20 and 21 - are for FTP

24
Q

Port numbers can be up to:

A

0 - 65535, they direct packet traffic between the source and destination computers

25
Q

What and how many port numbers are reserved ( or well known ports )?

A

1st 1024

26
Q

Routers look at _____ not MAC addresses.

A

IP addresses

27
Q

Every router has one of these and based on the network information of the packet, where to actually send the data:

A

Routing Table

28
Q

TCP, which makes sure data gets from PC to PC completely stands for:

A

Transmission Control Protocol ( Connection oriented )

29
Q

2 big pieces of TCP are:

A

Sequencing number and Acknowledgement Number

30
Q

What protocol is connectionless, just sends data and hopes:

A

UDP ( User Datagram Protocol ) used for videos and gaming

31
Q

How does the network software know how to reassemble a file?

A

Sequencing numbers

32
Q

This hardware device Generates, receives, and destroys frames:

A

NIC network interface card

33
Q

Packets come from what layer:

A

Layer 3 or Network Layer

34
Q

Segments and sequencing take place and come from what layer:

A

Layer 4 or Transport layer

35
Q

What is & describes physical addressing, and the rules about creating and transmitting frames:

A

MAC ( Media Access Control )

36
Q

Mediums and Cablings are also known as:

A

Topologies

37
Q

MAC addresses use hexadecimal values of:

A

0-9 and A-F only

38
Q

2 types of Topologies are:

A

Physical - how a network is laid out.
Logical - Explains how data is sent between them.

39
Q

What is the oldest Topology computers share the same bandwidth and utilize “Drop Downs” or one single trunk

A

Bus Topology

40
Q

IBM Token Ring - all computers are connected in a ring:

A

Ring Topology

41
Q

Computers are plugged into a hub / switch in the center of the computers

A

Star Topology

42
Q

Most popular Topology used today

A

Star-Bus / or Hybrid Topology

43
Q

Where all hosts are connected to all host at the same time and is great for Wireless networks.

A

Mesh Topology (or Mess)

44
Q

Mesh Topologies have __________ which when a cable breaks between 2 computers, it doesn’t affect the connection between the other machines.

A

Fault tolerance

45
Q

large Partially Mesh networks use________ for better connectivity

A

Extenders

46
Q

What is the Electronic Circuit Flow of Frames

A

Logical Topology

47
Q

Examples of a broadcast IP address:

A

192.255.255.255 or 192.168.255.255 or 255.255.255.255

Network + (20 decks)

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