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APPENDIX C: Glossary
Port:
Network clients (LAN PC) use port numbers to distinguish one network
application/protocol from another. Below is a list of common applications and
protocol/port numbers:
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
pcANYWHERE
®
TCP
5631
pcANYWHERE
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 ten numbers (for example, 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).
