Xerox 6115MFP Guida Utente

LPD/LPR (Line Printer Daemon/Line Printer Request) is a platform-independent printing 
protocol that runs over TCP/IP. Originally implemented for BSD UNIX, its use has spread into 
the desktop world and is now an industry standard. 

Traditionally, in order to locate services on the network, users had to supply the host name or 
network address of the machine providing the desired service. This has created many 
administrative problems. 

However, SLP (Service Location Protocol) simplifies the discovery and use of network 
resources such as printers by automating a number of network services. It provides a 
framework that allows networking applications to discover the existence, location, and 
configuration of networked services.

With SLP users no longer need to know the names of network hosts. Instead, they need to 
know only the description of the service they are interested in. Based on this description, SLP 
is able to return the URL of the desired service. 

SNMP (Simple Network Management Protocol) is a set of protocols for managing complex 
networks. SNMP works by sending messages to different parts of a network. SNMP-compliant 
devices, called agents, store data about themselves in Management Information Bases (MIBs) 
and return this data to the SNMP requesters.

When printing through a network, TCP/IP port number 9100 can be used to send raw data.

SMTP (Simple Mail Transfer Protocol) is a protocol for sending email.

This protocol was originally used to send email between servers; however, currently client 
email software uses it to send email to servers using POP.