5019376
Beschreibung
Mindmap von Asia Dixon~Nyah!, aktualisiert more than 1 year ago
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Erstellt von Asia Dixon~Nyah!
vor mehr als 8 Jahre
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5. Internet and
Communications(Networking
Terms/Error Detection/Compression)
- Compression
- Used to make files smaller so that the
can be transmitted more quickly
- Lossy
- Individual file made
smaller, not all data stored
- e.g JPEG, MP3
- Individual file made
smaller, not all data stored
- Lossless
- Individual fie made
smaller, all data is stored
- e.g PNG, GIF
- Individual fie made
smaller, all data is stored
- Zipped
- Several files compressed tone file that is
easily stored or transmitted (lossless)
- e.g ZIP, RAR
- Several files compressed tone file that is
easily stored or transmitted (lossless)
- Decision
- Precise data
needed=lossless
- Lots of files compressed
needed=Zipped
- Precise data not
needed= lossy
- Reduce transmission time
- Save disk space
- Reduce transmission time
- Precise data
needed=lossless
- Used to make files smaller so that the
can be transmitted more quickly
- Networking Terms
- IP(Internet protocol) address
- unique number assigned to a
device on a network
- Used to ensure the right data
reaches the right device.
- IP addresses divided into four sections
- e.g 192.168.0.5
- unique number assigned to a
device on a network
- MAC(media access
control)address
- unique number i that is hardwired
into a device and cannot be changed
- 12 digit hexadecimal number
- e.g 53:a0:6f:10:44:bd
- unique number i that is hardwired
into a device and cannot be changed
- Packets
- When data is sent across a network it is broken
into smaller chunks called packets
- Packet header,data,
packet trailer
- header includes source address+destination address
- header contains identification number, needed to
reassemble data once transmission is complete
- header includes source address+destination address
- Advantages of packet
switching
- Packets do not need to take the
same route around the network
- packets do not need to arrive in the same
order as they left and reassembled by the
recipient computer
- Packets do not need to take the
same route around the network
- When data is sent across a network it is broken
into smaller chunks called packets
- IP(Internet protocol) address
- Error detection
- Data transmitted without any such
check is not to reliable
- Data can be repeatedly sent until a
predetermined number of transmissions
are identical i.e assumed to be uncorrupt
- Parity bit
- parity bit added to a transmitted piece of data. Set to
1= even number of 1's, Set to 0= odd number of 1's
- Not completely reliable
- parity bit added to a transmitted piece of data. Set to
1= even number of 1's, Set to 0= odd number of 1's
- Checksum
- Assigns more than one bit for the purpose of error detection
- Assigns more than one bit for the purpose of error detection
- Data transmitted without any such
check is not to reliable
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