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logons.
HTTPS is really just the use of Netscape's Secure Socket Layer (SSL) as a sublayer under its
regular HTTP application layering. (HTTPS uses port 443 instead of HTTP port 80 in its
interactions with the lower layer, TCP/IP.) SSL uses a 40-bit key size for the RC4 stream
encryption algorithm, which is considered an adequate degree of encryption for commercial
exchange.
I
ICMP
ICMP
is an acronym for Internet Control Message Protocol. It is a protocol that generated the
error response, diagnostic or routing purposes. ICMP messages generally contain information
about routing difficulties or simple exchanges such as time-stamp or echo transactions. For
example, the
IEEE 802.1X
IEEE 802.1X
authentication to devices attached to a LAN port, establishing a point-to-point connection or
preventing access from that port if authentication fails. With 802.1X, access to all switch ports
can be centrally controlled from a server, which means that authorized users can use the same
credentials for authentication from any point within the network.
IGMP
IGMP
is an acronym for Internet Group Management Protocol. It is a communications
protocol used to manage the membership of Internet Protocol multicast groups. IGMP is used
by IP hosts and adjacent multicast routers to establish multicast group memberships. It is an
integral part of the IP multicast specification, like ICMP for unicast connections. IGMP can be
used for online video and gaming, and allows more efficient use of resources when supporting
these uses.
IGMP Querier
A router sends IGMP Query messages onto a particular link. This router is called the Querier.
IMAP
IMAP
is an acronym for Internet Message Access Protocol. It is a protocol for email clients to
retrieve email messages from a mail server.
IMAP is the protocol that IMAP clients use to communicate with the servers, and
protocol used to transport mail to an IMAP server.
The current version of the Internet Message Access Protocol is IMAP4. It is similar to Post
Office Protocol version 3 (POP3), but offers additional and more complex features. For
example, the IMAP4 protocol leaves your email messages on the server rather than
downloading them to your computer. If you wish to remove your messages from the server,
you must use your mail client to generate local folders, copy messages to your local hard drive,
PING
command uses ICMP to test an Internet connection.
is an IEEE standard for port-based Network Access Control. It provides
-136-
SMTP
is the
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