
Function of other layers
layer 3 : routing
network connection establishment
release
multiplexing
congestion control
addressing
layer 4 : error detection / recovery
flow control
layer 4 connection, release, muxing
Layer 5 : session connection, etc.
management
session - transport management
layer 6 : encryption / decryption
compression / expansion
Layer 7 : application related functions
Jamadagni H S DC/V1/2004 21
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