SMC Networks Barricade SMC2404WBR - Manual (Page 112)

PPP protocol, commonly used for dial-up Internet connections, over
Ethernet. Used by DSL and some cable modem providers, PPPoE supports
the protocol layers and authentication widely used in PPP and enables a point-
to-point connection to be established in the normally multipoint architecture
of Ethernet. A discovery process in PPPoE determines the Ethernet MAC
address of the remote device in order to establish a session.
Q. What is DHCP?
A. Dynamic Host Configuration Protocol - Software that automatically
assigns IP addresses to client stations logging onto a TCP/IP network. It
eliminates having to manually assign permanent IP addresses. DHCP
software typically runs in servers and is also found in network devices such
as ISDN routers and modem routers that allow multiple users access to the
Internet. Newer DHCP servers dynamically update the DNS servers after
making assignments.
Q. What are TCP and UDP ports?
A. Transmission Control Protocol - TCP and UDP (User Datagram
Protocol) are the two transport protocols in TCP/IP. TCP ensures that a
message is sent accurately and in its entirety. However, for real-time voice
and video, there is really no time or reason to correct errors, and UDP is used
instead.
User Datagram Protocol - A protocol within the TCP/IP protocol
suite that is used in place of TCP when a reliable delivery is not required. For
example, UDP is used for real-time audio and video traffic where lost packets
are simply ignored, because there is no time to retransmit. If UDP is used and
a reliable delivery is required, packet sequence checking and error
notification must be written into the applications.
Q.
What are the definitions for the firewall terms in the Help File?