abc.com.pl 7
Russell Boski plan wieków
Pod redakcją Charlesa E. Skinnera Psychologia wychowawcza (3)
rozdzial 03 (279)
Bolesław Prus Lalka
rozdzial 01 (241)
J.R.R. Tolkien 03 The Return Of The King
wiedza i zycie4
24 (77)
Holl Heretycy
[ Pobierz całość w formacie PDF ]
.To create a direct access system, you must work with the Internet Network Information Center (NIC) to set up the proper gateways on the Internet backbone for your domain.The capital expense of such a system is high, both for the initial hardware and software and for continuing support.High costs may also be involved with a dedicated telephone line capable of supporting high-speed data transfer.Connecting through Another GatewayAn alternative method of connecting to the Internet through a gateway relies on using a friendly machine or network.In such a system, a corporation or educational institution that has an Internet gateway may allow you to access the Internet through their system.Because this type of access gives you freedom on their networks, many organizations now refuse this type of piggy-back access.If you are lucky enough to find a company or school that will let you use their network, you simply call into a communications port on the network or gateway, and then route through the gateway to the Internet.In many ways, it is as though you are a machine on the provider's network.Typically, you have unlimited access to the Internet's services, although some companies do set restrictions.Using a Service ProviderService providers are companies that have an Internet gateway that they share, although the gateway is often transparent to the users.This type of connection is often called dialup and uses SLIP (serial line interface protocol) or PPP (point-to-point protocol).Some service providers offer UUCP connections for e-mail.Service providers usually offer dedicated connection lines to their Internet gateways, although the dedicated lines can be expensive.Service providers usually charge a flat fee for membership with an additional charge based on the amount of time or the number of characters transferred.Joining one of these services is quite easy, although some insist that you maintain a minimum amount of usage a month.You can register domain names through many service providers, too, which enables you to use your own domain even though you use a provider.The primary advantage of direct service providers is that you are effectively directly connected to the Internet.The communication between your machine and the service provider's gateway is hidden inside your operating system's setup.A disadvantage to this method is that you cannot always arrange full access to the Internet.Some services do not allow you to FTP through their gateway to another Internet site, for example.If you are considering using a direct service provider, ask the providers in your area about the services they offer, whether special hardware or software is needed, what the fees are and whether they are based on a flat monthly rate or based on usage, and the kind of technical support available in case you have trouble.An alternative to using a commercial service provider is to rely on one of the command-line access systems that are springing up in major cities.Such systems provide Internet access through their own gateways as a free service (subsidized by a corporation or government) or at a minimal cost.One popular access provider of this type is FreeNet, an international organization that gives users a unique username through the FreeNet domain.FreeNet is currently only available in some cities, but it does provide an extremely inexpensive and easy access method to the Internet.All you need is an account (which is usually just a telephone call away), a modem, and communications software.SummaryChoosing the method with which you connect to the Internet is up to you, but most individuals find a direct service provider the best balance between cost and features.Once you have a connection to the Internet, you can set up your server, as explained in the next four chapters [ Pobierz całość w formacie PDF ]
