ISP (Internet Service Provider) is an organization, usually commercial, that allows third-parties to connecto to the internet through their high speed backbone connection. ISP usually provides services like Internet access through PPP account, domain name registration and service, email account, WEB host and so on.

TCP/IP (Transmission Control Protocol/Internet Protocol) is an industry-standard suite of protocols. As a standard, routable enterprise network protocol, it is the most complete and accepted protocol available. All modern operating systems offer TCP/IP support, and the Internet rely on TCP/IP for much of their network traffic. If you want to "surf" the Internet, you must use this protocol.

PPP Point-to-Point Protocol. This protocol is the extension of Internet protocols over serial connections. Most ISPs provide Internet access services use PPP over modem and telephone lines, that is, dial up connection.

IP Address IP Address is a logical 32-bits address used to identify a TCP/IP host. Each IP Address has two parts - the network ID and the host ID.

• The network ID identifies all hosts that are on the same physical network.
• The host ID identifies a host on a network.

Dynamic IP is an assigned IP address to the host when connecting to the network each time. Such as the ISP's router negotiates a new IP address, (Dynamic IP) every time it is called by the NetLinker. An workstation is assigned an new IP address (Dynamic IP) by the DHCP server each time it is up to the network.

DHCP (Dynamic Host Configuration Protocol) is a protocol that lets network administrators manage centrally and automate the assignment of IP addresses in an organization's network. When an organization sets up its computer users with a connection to the network, an IP address must be assigned to each machine. Without DHCP, the IP address must be entered manually at each computer and, if computers move to another location in another part of the network, a new IP address must be entered. DHCP server automatically supplies the LAN addressing that is needed to identify each machine. This includes IP address, Domain Name Server Name and Default Gateway. This clearly reduces complexity and effort for the non-technical user.

Domain Name

The unique name that identifies an Internet site. Domain Names always have 2 or more parts, separated by dots. The part on the left is the most specific, and the part on the right is the most general. A given machine may have more than one Domain Name but a given Domain Name points to only one machine.

DNS Domain Name Service maintains a database that maps the Host Names to their IP Address. DNS relies upon the DNS server to provide hostname-to-IP translations. So if you configure your DNS server IP Address, you could access a server by using its name that is easily remembered instead of using its IP Address that is confused all the time.

Ethernet

IEEE standard network protocol that specifies how data is placed on and retrieved from a common transmission medium. Ethernet is a very common method of networking computers in a Local Area Network. Ethernet will handle about 10,000,000 bits-per-second and can be used with almost any kind of computer.

Router

A special-purpose computer (or software package) that handles the connection between 2 or more networks. Routers spend all their time looking at the destination addresses of the packets passing through them and deciding which route to send them on. When a request for information or connection does not belong to the LAN it is attached to, the router will routes the request to another router on another LAN.

 

E-Mail

(Electronic Mail) -- Messages, usually text, sent from one person to another via computer. E-mail can also be sent automatically to a large number of addresses (Mailing List).

Mail Server NetLinker provide Mail Server function, which enable the users on Intranet connected to Internet to send and receive e-mail world widely.

POP3 Post Office Protocol 3. The Internet protocol, described in RFC 1732, that specifies mail exchange between a client and a server. NetLinket as a POP3 server can hold mail for a POP3 client, such as Microsoft Outlook, Netscape Mail, or Eudora.

When you obtain a PPP account, you almost always get a POP account with it, and it is this POP account that you tell your e-mail software to use to get your mail.

SMTP Simple Mail Transport Protocol -- The main protocol used to send electronic mail on the Internet.
SMTP consists of a set of rules for how a program sending mail and a program receiving mail should interact.
Almost all Internet email is sent and received by clients and servers using SMTP, thus if one wanted to set up an email server on the Internet one would look for email server software that supports SMTP.

ETRN ETRN is SMTP service extension for remote message queue starting, specified by RFC 1985.

MX – Mail Exchange Records. Records used by DNS to route mail, an ordered list of destinations. MX records tell mailers where to send messages to reach a given domain.

NAT ( Network Address Translation) is a technology which allows your privately addressed network to connect to the public Internet. Each PC can have its own private IP address, which sharing a public IP Address.
For example :
The NetLinker dial-up to the ISP , establish a PPP connection and get a public IP address from the ISP when one user on the private network requests a web page. When a web server returns a web page, the NetLinker converts the public IP address to the private IP address of the PC. NetLInker keeps track of the IP addresses of each PC on your private network so it can route data to the correct PC.

Internal Network The Internal Network is usually connected to the Intranet and use unregistered IP address. If connected to Internet, it is identified by Internet user through IP Address Translation.

IP Address Translation IP Address Translation function enable the Internal users to access Internet Network.