3.1 Network Fundamentals Flashcards

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1
Q

What is a network?

A

A group of computer systems that of hardware devices that are linked together through communication channels.

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2
Q

What is a LAN?
What does it (most likely) use.

A

Local Area Network
Covers a Local Area
Ethernet - twisted pair cables or wireless.

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3
Q

What is a WAN?
What does it (most likely) use.
Example

A

Wide Area Network
A network that covers an area larger than a WAN
Wired or Wireless
Internet

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4
Q

What is a VLAN?
What does it (most likely) use.

A

Appear to be on same LAN, however over different countries thanks to being in a virtual area.
Communicates in stimulated environments.

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5
Q

What is a SAN?
How does it work?

A

Storage Area Network
Secure high speed data transfer network that provides some storage
Appear as attached drives

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6
Q

What is a WLAN?
How does it work?
example.

A

Wireless LAN
Uses wireless methods to access the internet.
e.g. wi-fi

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7
Q

What is the internet?

A

A globally connected network system, that uses protocols to transmit data.

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8
Q

What is the world, wide, web?

A

Global communication system using hardware and inftrastructure

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9
Q

What is Extranet?

A

Controlled private network allowing selected users to gain information without accessing the entire network.

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10
Q

What is Intranet?

A

Controlled private network allowing selected users to gain information without accessing the entire network.
Unlike Extranet, can’t access the Internet.

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11
Q

What is a VPN?

A

It is a virtual private network that allows people to log into a network remotely, then encrypts the information so they are safer.

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12
Q

What is PAN?

A

Personal Area Network
A network covering a very small area.

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13
Q

What is p2p?

A

Peer to Peer network model where computers or hardware devices exchange files rather than going through a switch or router.

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14
Q

What is a node?

A

A user device e.g. laptop

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15
Q

What is a network interface card?

A

provides a computer with a dedicated, full-time connection to a network.

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16
Q

What is a wireless AP /router?

A

Connection point

17
Q

What does a network require in hardware [4]

A

Node, NIC, Radio Waves, Router/Wireless AP

18
Q

What does a network require in software [3]

A

Network OS
Protocol Stack
Applications

19
Q

What two technologies can a VPN do?

A

Encryption - encoding data so that only computer with right decoder can read it
and Tunnelling - establishing and maintains a logical network connection so that only certain packets can get through if they have a specific base carrier protocol.

20
Q

What does a VPN require? [4]

A

A LAN that is connected to the internet
One computer outside LAN always connected to internet.
VPN Client and server running on a lone machine outside of LAN
Internet Connection

21
Q

Why would you use a VPN?

A

Possible to connect to LAN outside Internet
Possible to connect anywhere in the world.
Allows possibility for home offices.

22
Q

What are the seven layers?

A

ACRONYM = All People Say Newts Don’t Party
Application
Presentation
Session
Transport
Network
Data Link
Physical

23
Q

What does the Application layer do?

A

Provides application services and shows the user’s website.

24
Q

What does the Presentation layer do?

A

Translating application to network data so application can read it

25
Q

What does the Session layer do?

A

Establishes connections between applications, and establishes rules of communication

26
Q

What does the Transport layer do?

A

Transfers data between systems + hosts, plus checks for errors.

27
Q

What does the Data Link layer do?

A

Data packets are encoded into bits.

28
Q

What does the Physical layer do?

A

Sending and receiving data on bit stream.