Interlogix NS3550-2T-8S User Manual - Manual (Page 620)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
620
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 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 MultiCast.
IPMC supports IPv4 and IPv6 multicasting. IPMCv4 denotes multicast for IPv4. IPMCv6 denotes multicast for IPv6.
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 host.
L
LACP
LACP is an IEEE 802.3ad standard protocol. The Link Aggregation Control Protocol, allows bundling several physical
ports together to form a single logical port.
LLC
The IEEE 802.2 Logical Link Control (LLC) protocol provides a link mechanism for upper layer protocols. It is the upper
sub-layer of the Data Link Layer and provides multiplexing mechanisms that make it possible for several network
protocols (IP, IPX) to coexist within a multipoint network. LLC header consists of 1 byte DSAP (Destination Service
Access Point), 1 byte SSAP (Source Service Access Point), 1 or 2 bytes Control field followed by LLC information.