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LGB5128A User Manual
238
HTTPS
HTTPS is an acronym for Hypertext Transfer Protocol over Secure Socket Layer. It is
used to indicate a secure HTTP connection.
HTTPS provide authentication and encrypted communication and is widely used on the
World Wide Web for security-sensitive communication such as payment transactions and
corporate logons.
HTTPS is really just the use of Netscape's Secure Socket Layer (SSL) as a sub-layer
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 generates
the error response for 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 PING command uses ICMP to test an Internet connection.
IEEE 802.1X
IEEE 802.1X is an IEEE standard for port-based Network Access Control. It provides
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, similar to 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 SMTP is
the 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, and then delete and expunge the messages from the server.