User`s manual

67
Port: Network Clients (LAN PC) uses port numbers to distinguish one network application/protocol over another.
Below you will find a list of some common used ports and their corresponding application:
Port Application Port Application
20 FTP data (FTP server) 80 HTTP (Web server)
21 FTP data (FTP server) 110 POP3 (Mail server – incoming)
22 SSH (Secure shell) 2000 Remotely Anywhere
23 Telnet 5800 VNC
25 SMTP (Mail server – outgoing) 5900 VNC
For more ports and their corresponding applications, see http://portforward.com/cports.htm.
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.
WAN: Wide Area Network. A network that connects computers located in geographically separate areas (e.g.
different buildings, cities, countries). The Internet is a wide area network.
Web-based management Graphical User Interface (GUI): Many devices support a graphical user interface that is
based on the web browser. This means the user can use the familiar Netscape or Microsoft Internet Explorer to
Control/configure or monitor the device being managed.