3.1 Network Fundamentals Flashcards
What is a network?
A group of computer systems that of hardware devices that are linked together through communication channels.
What is a LAN?
What does it (most likely) use.
Local Area Network
Covers a Local Area
Ethernet - twisted pair cables or wireless.
What is a WAN?
What does it (most likely) use.
Example
Wide Area Network
A network that covers an area larger than a WAN
Wired or Wireless
Internet
What is a VLAN?
What does it (most likely) use.
Appear to be on same LAN, however over different countries thanks to being in a virtual area.
Communicates in stimulated environments.
What is a SAN?
How does it work?
Storage Area Network
Secure high speed data transfer network that provides some storage
Appear as attached drives
What is a WLAN?
How does it work?
example.
Wireless LAN
Uses wireless methods to access the internet.
e.g. wi-fi
What is the internet?
A globally connected network system, that uses protocols to transmit data.
What is the world, wide, web?
Global communication system using hardware and inftrastructure
What is Extranet?
Controlled private network allowing selected users to gain information without accessing the entire network.
What is Intranet?
Controlled private network allowing selected users to gain information without accessing the entire network.
Unlike Extranet, can’t access the Internet.
What is a VPN?
It is a virtual private network that allows people to log into a network remotely, then encrypts the information so they are safer.
What is PAN?
Personal Area Network
A network covering a very small area.
What is p2p?
Peer to Peer network model where computers or hardware devices exchange files rather than going through a switch or router.
What is a node?
A user device e.g. laptop
What is a network interface card?
provides a computer with a dedicated, full-time connection to a network.
What is a wireless AP /router?
Connection point
What does a network require in hardware [4]
Node, NIC, Radio Waves, Router/Wireless AP
What does a network require in software [3]
Network OS
Protocol Stack
Applications
What two technologies can a VPN do?
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.
What does a VPN require? [4]
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
Why would you use a VPN?
Possible to connect to LAN outside Internet
Possible to connect anywhere in the world.
Allows possibility for home offices.
What are the seven layers?
ACRONYM = All People Say Newts Don’t Party
Application
Presentation
Session
Transport
Network
Data Link
Physical
What does the Application layer do?
Provides application services and shows the user’s website.
What does the Presentation layer do?
Translating application to network data so application can read it
What does the Session layer do?
Establishes connections between applications, and establishes rules of communication
What does the Transport layer do?
Transfers data between systems + hosts, plus checks for errors.
What does the Data Link layer do?
Data packets are encoded into bits.
What does the Physical layer do?
Sending and receiving data on bit stream.
