Planet GS-5220 Series, Руководство пользователя, Страница: 552 / 568

User’s Manual of GS-5220 LCD Series
552
encryption algorithm, which is considered an adequate degree of encryption for commercial
exchange.
I
ICMP
ICMP is an acronym for I nternet C ontrol M essage P rotocol. 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 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
I
nternet
G
roup
M
anagement
P
rotocol. 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 I nternet M essage A ccess P rotocol. 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