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:
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, without confusion or misunderstanding.
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:
Transmission Control Protocol/Internet Protocol (TCP/IP)
and Unreliable Datagram Protocol (UDP). TCP/IP is the standard protocol
for data transmission over the Internet. Both TCP and UDP are transport
layer protocol. TCP performs proper error detection and error recovery,
and thus is reliable. UDP on the other hand is not reliable. They both run
on top of the IP (Internet Protocol), a network layer protocol.
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