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Network standards and protocols (7 layers (transport layer (checksum…
Network standards and protocols
Protocols
formal rules and procedures
allowing
receiving
data
interpreting
transmitting
Standards
a model
OSI (Open System Interconnection)
by
ISO (International Standards Organizations)
1984
OSI
7 layers
each one
adds informations
subset of functions
"Protocol stack"
7 layers
presentation layer
translating in ASCII
encrypting data
header specifing
encryption language
application layer
providing services to user
converting data
from characters to bit
header identifying
sending
receiving
session layer
opening communications
full duplex
or
half duplex
transport layer
protecting data
checksum
integrity control
header identifying
each segments
dividing data
segments
network layer
route for messages
segments = packets
header containing
destination address
sequence number
data-link layer
supervising the transportation
physical layer
ecoding/deconding
packets
sending