Internetworking services are the services in a networking environment that are accessible to users within an intranet or the Internet. These services allow you to share or use the resources located across networks. The servers that provide these services are known as

Internetworking Servers. Examples of Internetworking Servers are Mail servers, News Servers, and so on.

The following are some of the services provided by the Internetworking servers:

• File Transfer - This service enables file transfer accross machines, using the HTTP protocol .
  

• WWW - This services enables users to access the HTML pages at a published site.
  

• E-mail - This services enables users to communicate with other users. The SMTP service needs to run for managing the receipt/delivery of mail messages.
  

• Telnet - This services enables users to logon remotely to a server. THe Telnet service has to run for allowing the clients to log on to a remote server.
  

• Usenet newsgroups - This service provides users a set of bulleting boards about different subjects. The NNTP service is neede for this purpose.
  

Other Internetworking Servers

Apart from web servers, mail servers, mailing list servers, and FTP servers, many other servers are used on an internetwork. Some of the internetworking servers are :

• Domain Name Servers (DNS)
• News Servers
• Proxy and caching servers
  
• Media servers
  
• Certificate servers
  
• Catalog servers
  
• FAX servers
  
• Transaction servers
• Mirrored servers

Domain Name Servers
DNS is a service used on the Internet to translate Fully Qualified Domain Names (FQDN) to their actual IP addresses.

News Servers
A news server stores, organize, and distributes the messages posted in newsgroup.

Media Servers
A media server is a server that maintains streaming audio/video content.

Certificate Servers
Certificate are digitaly signed documents that enable you to use smart card logon, send encrypted e-mail, and sign electronic documents.

FAX Servers
A fax server allows multiple users to send faxes over the network. A fax server usually consists of three components, a computer running a Windows OS connected to any network, fax server application software, and a fax modem or an intelligent fax board.

Transaction Servers
A transaction server manages applications and databse transaction request on behalf of client computers.

Mirrored Servers
Similar to redudant disk drives, mirrored servers provide the fault-tolerance and redudancy that mission-critical information systems need.