Example Accessing ***. co. jp
Client
***. co. jp 1 Request
2 Response 170.10.12.5
170.10.12.5 Server for ***. co. jp
DNS server
3 Access using IP address
Router
2 Internet services
***. co. jp 170.10.12.5 Determine IP address
Router
Internet
A variety of services are provided over the Internet. The main types of services provided over the Internet are summarized below.
Service name
WWW
E-mail
FTP
Telnet
Netnews
Description
A service for publishing or viewing information over the Internet. Can be used to publish and view static images, video, and audio in addition to text information( characters).
A service for exchanging messages. Enables the user to exchange messages with a specific person, similar to exchanging letters.
A service for transferring fi les. Used to download and upload fi les.
A server that enables remote operation of computers over a network.
An information sharing service. Users can subscribe to newsgroups to receive messages from group members, or send a message to all group members.
3 Communication services
Protocol HTTP
SMTP, POP3, IMAP4
FTP
Telnet
NNTP
An“ ISP( Internet Service Provider),” also called a“ provider,” provides communication services for the Internet. Connection fees are collected from users and in return, various Internet services are provided.
Reference
Broadcast mail“ Broadcast mail” refers to the process of sending e-mail containing the same content to multiple e-mail addresses. When sending broadcast mail, e-mail addresses are entered into the“ Cc” or“ Bcc” address slots. Cc: E-mail addresses of persons to receive mail are specified for reference. Addresses are visible to all recipients so that recipients can be made aware of who else the message has been sent to. Abbreviation for“ Carbon Copy.”
Bcc: Unlike Cc, e-mail addresses are hidden from recipients so that recipients do not know who else the message has been sent to. Abbreviation for“ Blind Carbon Copy.”
Reference
Mailing list A“ mailing list” is a system that can be used to communicate with multiple persons using e-mail. It is possible to send e-mail to all of the members registered to the mailing list simply by sending an e-mail to a specified address.
Reference
Mailbox A“ mailbox” is a virtual space that is used for temporarily storing incoming e-mail. Usually, an upper limit is placed on the capacity of the mailbox.
Reference
NNTP Abbreviation for“ Network News Transfer Protocol.”
Reference
ISP Abbreviation for“ Internet Service Provider.”
Chapter 9 Technology element
Reference
Carrier A“ carrier” is a business operator who provides lines for connecting to the Internet.
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