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Saturday, November 30, 2013

Other Upper-Layer Protocols


Other Upper-Layer Protocols

Various other upper-layer protocols play an important role in the success of the TCP/IP protocol suite as a flexible, well-rounded, self-contained group of protocols:

  • UDP
  • SMB
  • AFP
  • ICS

Line Printer Remote (LPR)


Line Printer Remote (LPR)

When using pure TCP/IP printing (as with UNIX workstations or when used for cross-platform printing), the LPD/LPR pairing is used most often. The Line Printer Daemon (LPD) is installed
on the print device and manages the printer as well as the print jobs. The Line Printer Remote (LPR) software is the printing client that sends the print jobs to the LPD via TCP/IP.

Internet Group Management Protocol (IGMP)


Internet Group Management Protocol (IGMP)

The Internet Group Management Protocol (IGMP) is a TCP/IP protocol that is used to manage IP multicast sessions. It uses special IGMP messages to learn the layout of the multicast groups
and which hosts belong to which groups. Additionally, the individual hosts in an IP network use IGMP messages to join and leave a multicast group. IGMP messages help keep track of group
membership and active multicast streams. IGMP is in its second version, as specified in RFC 2236, with a third version (RFC 3376), currently proposed.