Cloned from: CCNA - OSI layer



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OSI model
Name the 7 layers of the OSI model
\\\"Application layer
Now....keywords/definition...
Application layer
User\\\'s interface to the network. Communication partners identified.
Presentation layer
Data format - Encryption, Compression
Session layer
Keeps data streams separate. Uses port #\\\'s from layer 4 (starting port/destination port). Establish and terminate communications.
Transport layer
Reliable (connection)/unreliable (Connectionless) transport of segments
Network layer
Provides logical addressing used by routers for path determination to route packets
Data link layer (part 2)
Bits into bytes -> Bytes into frames. MAC address
Data link layer (part 1)
Divided into two sub layers (MAC and Logical Link Control)
Physical layer
Moves bits across media (cables, connectors, pins, electrical signals)
Now... Protocols
Application layer
HTTP, Telnet, FTP (TCP), TFTP (UDP), SMTP, SNMP
Presentation layer
JPG, MPEG, MIDI, ACII
Session layer
SQL, NFS (Unix), RPC
Transport layer
Connection oriented - TCP, SPX. Connectionless - UDP
Network layer
IP (ICMP, ARP, RARP), IPX, Apple Talk, DECNET
Data link layer - WAN
HDLC, PPP, Frame Relay, ISDN, ATM
Data link layer - LAN
802.2 (LLC), 802.3 (Ethernet), 802.5 (Token ring), 802.11 (Wireless)
Physical layer
EIA/TIA 232 (RS232), V.35, Cat5, RJ45
Now....Devices
Physical layer
Cable, connector, hub, repeater
Data link layer
NIC, Switch, bridge
Network layer
Router
Now...Encapsulation
Application layer
Messages and packets
Presentation layer
Packets
Session layer
Packets
Transport layer
Segments, datagrams and packets
Network layer
Packets and datagrams
Data link layer
Frames
Physical layer
Bits
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