That would be like if I asked you how TCP works and you said, isn't TCP just data within an IP packet? Now I'm asking you to consider how application-layer protocols work. They have operations also. In the case of HTTP, there are many commands. The question is how are the commands encoded? It's yet another variety (beyond bit-oriented and byte-oriented) that is worth considering.
The data is HTML-encoded text, GIFs, etc, which isn't too interesting (from our perspective). HTTP is rather interesting, however. So is FTP, especially since it has a tendency to break in many environments. And you didn't answer me how TCP operations, such as SYNs are encoded. Well, we've gotten off topic. I think it should be "on topic," but Cisco test developers don't tend to consider these issues. ;-) Priscilla At 03:51 PM 2/7/02, Steven A. Ridder wrote: >""Priscilla Oppenheimer"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > At 03:26 PM 2/7/02, Priscilla Oppenheimer wrote: > > > > >What is TCP? How is a SYN represented in TCP? > > > > > >What is HDLC? How is a GET represented in HDLC? > > > > That was supposed to say HTTP! HTTP, FTP, SMTP, POP and probably others, > > have yet another way of encoding control information. > >Isn't it all just data within the packets and not flags in a packet, like in >TCP? > >It's byte-oriented > > but a little different. > > > > And how about routing protocols? For example, how does EIGRP encode an > > Update opcode? Is it different from how HTTP, FTP, etc. send control info? > > And different from TCP? > > > > > > >What is FTP? How is a RETR represented in FTP? > > > > > >And how about Token Ring with its starting delimiter and ending >delimiters? > > >And how should one interpret the Ethernet preamble? > > > > > >Also, aren't all protocols at some level processed a bit at a time? > > > > > >This is bad as the 7-layer discussions! ;-) > > > > > >Priscilla > > > > > > ________________________ > > > > Priscilla Oppenheimer > > http://www.priscilla.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34789&t=34629 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
