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CCNA study
OSI Model
Application
File, print, message, database, and applications
Determines availability of the target host.
Www, email, ftp, telnet, edi, quake
Presentation
Data Encryption, compression, and translation services
Determines the syntax of the data transfer.
Pict, tiff, jpeg, midi, mpeg, quicktime, etc
Session
Dialog control, coordinates the comunications
Nfs, sql, rpc, x windows, asp (appletalk session protocol), DNA SCP (
digital
whatzit)
Transport
End-to-end communication
Responsible for hiding the communications from the higher layers.
TCP / UDP
Network
Routing
IP / ICMP, BootP, ARP, RARP
Routers
Data Link
Framing
Ethernet II, 802.5 (token ring), 802.3, 802.2 (802.3 with dsap and ssa
p logical
link control fields)
Media access control: MAC: 48 bits, 3 bytes vendor + 3 bytes serial nu
mber
WAN:
High-level datalink control HDLC (cisco default for serial links)
Synchronous Data Link Control SDLC (uses polling)
Link Access Procedure, Balanced LAPB
x.25, slip, ppp, isdn, Frame Relay
Bridges / Switches
Physical
Wire?nbsp;
v.24, v.35, x.21, g.703, hssi, etc
Repeaters / Hubs
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