Computing 205/406 & IT8

Tutorial #3

  1. What is "remote login"? What is the standard protocol which provides remote login on the Internet?

  2. The TELNET protocol defines a Network Virtual Terminal, (NVT) which means that servers and clients don't need to know the details of the actual terminal (if any) at the other end of the connection. The alternative to this approach is to perform terminal emulation. What is meant by terminal emulation, and why is the NVT approach better?

  3. What are some of the characteristics of the TELNET NVT?

  4. When the telnet program starts up, it informs the user as follows:
    ironbark 27> telnet redgum
    Trying 149.144.20.3...
    Connected to redgum.bendigo.latrobe.edu.au.
    Escape character is '^]'.
    
    What is the "escape character" used for?

  5. The[1] text file for RFC 854 (the TELNET protocol specification) contains exactly 854 lines. Do you think there is cosmic significance in this?

  6. (Research question) How does TELNET perfom option negotiation?

Practical exercises:


[1] From Comer, P418.
This tutorial is also available in PostScript format.
Phil Scott