Planet GS-5220 Series, User Manual, Page: 553 / 568

User’s Manual of GS-5220 LCD Series
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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 I nternet P rotocol. It is a protocol used for communicating data across a internet
network.
IP is a "best effort" system, which means that no packet of information sent over it 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 remain unused. There
is a rather substantial movement to adopt a new version of the Internet Protocol, IPv6, which
would have 128-bits Internet Protocol addresses. This number can be represented roughly by a
three with thirty-nine zeroes after it. However, IPv4 is still the protocol of choice for most of the
Internet.
IPMC
IPMC is an acronym for IP M ulti C ast.
IP Source Guard
IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted ports
by filtering traffic based on the DHCP Snooping Table or manually configured IP Source Bindings.
It helps prevent IP spoofing attacks when a host tries to spoof and use the IP address of another