Segments: Defined at the Transport layer, these are part of a data stream that is handed down from the upper layers to be transmitted to a destination device.
Ethernet Frame:
Preamble, DA, SA, Type, Data, FCS
OSI Model:
Application layer 7File, print, message, database, and applications. Determines availability of the target host. www, email, ftp, telnet, EDI, quake
Presentation layer 6
Text and Data Formatting, Data Encryption, Compression, and Translation services Determines the syntax of the data transfer. Pict, tiff, jpeg, midi, mpeg, quicktime, EBCDIC and ASCII
Session layer 5
Service Requests, Dialog control, coordinates the communications, Establishes, Manages, and terminates communication sessions between applications. Offers full or half-duplex define and group formatted data, and offers some session recovery or checkpoint mechanisms between the applications coordinated between the hosts. NFS, SQL, RPC, X Windows, ASP (appletalk session protocol), DNA SCP (digital whatzit)
Transport layer 4
***TCP uses Three-way handshake for Transport test question***