ZyXEL Communications 650 Series Technické informace Strana 150

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Application Protocol Port Number
Telnet TCP 23
FTP TCP 21
SMTP TCP 25
POP3 TCP 110
H.323 TCP 1720
SNMP UCP 161
SNMP Trap UDP 162
HTTP TCP 80
PPTP TCP 1723
PC Anywhere TCP 5631
PC Anywhere UDP 5632
PPPoE: PPPoE stands for Point-to-Point Protocol over Ethernet. Point-to-Point Protocol is a
secure data transmission method originally created for dial-up connections; PPPoE is for
Ethernet connections. PPPoE relies on two widely accepted standards, Ethernet and the
Point-to-Point Protocol. It is a communications protocol for transmitting information over
Ethernet between different manufacturers
Protocol: A protocol is a set of rules for interaction agreed upon between multiple parties so
that when they interface with each other based on such a protocol, the interpretation of their
behavior is well defined and can be made objectively and without any confusion or
misunderstandings.
Router: A router is an intelligent network device that forwards packets between different
networks based on network layer address information such as IP addresses.
Subnet Mask: A subnet mask, which may be a part of the TCP/IP information provided by
your ISP, is a set of four numbers (e.g. 255.255.255.0) configured like an IP address. It is
used to create IP address numbers used only within a particular network (as opposed to
valid IP address numbers recognized by the Internet, which must be assigned by InterNIC).
TCP/IP, UDP: TCP/IP stands for Transmission Control Protocol/Internet Protocol (TCP/IP)
and UDP stands for Unreliable Datagram Protocol (UDP). TCP/IP is the standard protocol for
data transmission over the Internet. Both TCP and UDP are transport layer protocols. TCP
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