20 terms

The OSI Model

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Layer 1
PHYSICAL Layer
Concerned with the transmission
and reception of the unstructured
raw bit stream over the physical medium.
Layer 2
DATA LINK Layer
Provides error-free transfer of data frames from one node to another over the Physical layer.
Layer 3
NETWORK Layer
Controls the operations of the subnet, deciding which physical path the data takes.
Layer 4
TRANSPORT Layer
Ensures that messages are
delivered error-free, in sequence,
and with no losses or duplications.
Layer 5
SESSION Layer
Allow session establishment
between processes running on
dierent stations.
Layer 6
PRESENTATION Layer
Formats the data to be presented
to the Application layer. It can be
viewed as the "Translator" for
the network.
Layer 7
APPLICATION Layer
Serves as the window for users and application processes to access the network services.
APPLICATION Layer
End User Layer: Program
that opens what was
sent or creates what is
to be sent
APPLICATION Layer
User Applications
SMTP
PRESENTATION Layer
Syntax Layer:
Encrypt & decrypt
PRESENTATION Layer
JPEG/ASCII/EBDIC/
TIFF/GIF/PICT
SESSION Layer
Synch & send to ports
(logical ports)
TRANSPORT Layer
TCP: Host to Host,
Flow Control
Transport Layer
TCP/SPX/UDP
Packet Filtering
NETWORK Layer
Packets: "letter",
Contains an IP address
Packet Filtering
Network Layer Protocols
Routers
IP/IPX/ICMP
DATA LINK Layer
Frames: "envelopes",
contains layer 2 address
(ex MAC address)
DATA LINK Layer
Switch
Bridge WAP
PPP/SLIP
PHYSICAL Layer
Physical structure:
Cables, hubs, etc.
PHYSICAL Layer
HUB
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