Konica-minolta Magicolor 2450 User Manual download pdf (Page 124)

Network Printing108

Unicast, Multicast, and Broadcast

SLP is a unicast and a multicast protocol. This means that messages can be

sent to one agent at a time (unicast) or to all agents (that are listening) at the

same time (multicast). However, a multicast is not a broadcast. In theory,

broadcast messages are “heard” by every node on the network. Multicast

differs from broadcast because multicast messages are only “heard” by the

nodes on the network that have “joined the multicast group.”

For obvious reasons network routers filter almost all broadcast traffic. This

means that broadcasts that are generated on one subnet will not be “routed”

or forwarded to any of the other subnets connected to the router (from the

router’s perspective, a subnet is all machines connected to one of its ports).

Multicasts, on the other hand, are forwarded by routers. Multicast traffic from

a given group is forwarded by routers to all subnets that have at least one

machine that is interested in receiving the multicast for that group.

SNMP

SNMP (Simple Network Management Protocol) is actually a set of protocols

for managing complex networks. SNMP works by sending messages to differ-

ent 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.

Port 9100

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

send raw data.

SMTP

SMTP (Simple Mail Transfer Protocol) is a protocol for sending e-mail.

This protocol was originally used to send e-mail between servers; however,

currently client e-mail software use it to also send e-mail to servers using

POP.

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Konica-minolta Magicolor 2450 User Manual Page 124