User manual

User Manual
Publication date: Feb., 2013
Revision A3
268
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.
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, 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 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.
IP
IP is an acronym for Internet Protocol. It is a protocol used for communicating data across an
internet network.
IP is a "best effort" system, which means that no packet of information sent over is assured to
reach its destination in the same condition it was sent. Each device connected to a Local Area
Network (LAN) or Wide Area Network (WAN) is given an Internet Protocol address, and this
IP address is used to identify the device uniquely among all other devices connected to the
extended network.
The current version of the Internet protocol is IPv4, which has 32-bits Internet Protocol
addresses allowing for in excess of four billion unique addresses. This number is reduced
drastically by the practice of webmasters taking addresses in large blocks, the bulk of which