User manual

Cobalt CacheRaQ 4 User Manual 91
Inter-Cache Communication Protocol (ICP)
An Internet protocol used to create cache hierarchies. A cache hierarchy is a
collection of caching proxy servers organized in a logical parent/child and
sibling arrangement so that cache servers closest to Internet gateways
(closest to the backbone transit entry-points) act as parents to cache servers
at locations farther from the backbone.
Internet Corporation for Assigned Names and Numbers (ICANN)
The private (non-government) non-profit corporation that has been formed to
assume responsibility for the IP address space allocation, protocol parameter
assignment, domain name system (DNS) management and root server
system management functions. These functions were previously performed
by the Internet Assigned Numbers Authority (IANA). The U.S. government
is essentially turning over control of the Internet to ICANN, although
domain name registration performed by Network Solutions, Inc. (NSI) will
continue to be under U.S. government contract for a limited time.
Internet domain
An Internet domain is a host naming convention used to ensure that no two
individual hosts on the global Internet have the same host name. An Internet
domain should not be confused with an NT Domain.
Internet Message Access Protocol (IMAP)
Internet Message Access Protocol is a standard protocol for accessing email
from your local server. IMAP is a client/server protocol in which email is
received and held for you by your Internet server. You (or your email client)
can view just the heading and the sender of the letter and then decide
whether to download the mail from the server. You can also create and
manipulate folders or mailboxes on the server, delete messages or search for
certain parts or an entire note. IMAP requires continuous access to the server
during the time that you are working with your mail.
IMAP can be thought of as a remote file server. Another protocol, Post Office
Protocol (POP), can be thought of as a store-and-forward service.
POP and IMAP deal with receiving email from your local server; Simple
Mail Transfer Protocol (SMTP) is a protocol for transferring email between
points on the Internet. You send email with SMTP and a mail handler
receives it on your recipient’s behalf. Then the mail is read using POP or
IMAP.
See also “Post Office Protocol 3 (POP3)” on page 95 and “Simple Mail
Transfer Protocol (SMTP)” on page 97.