KTI Networks KGS-2421 Manual de usuario Pagina 112

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Internet exists and is connected.
ping uses Internet Control Message Protocol (ICMP) packets. The PING
Request is the packet from the origin computer, and the PING Reply is the
packet response from the target.
PoE
PoE is an acronym for Power Over Ethernet.
Power Over Ethernet is used to transmit electrical power, to remote devices over
standard Ethernet cable. It could for example be used for powering IP telephones,
wireless LAN access points and other equipment, where it would be difficult or
expensive to connect the equipment to main power supply.
Policer
A policer can limit the bandwidth of received frames. It is located in front of the
ingress queue.
POP3
POP3 is an acronym for Post Office Protocol version 3. It is a protocol for email
clients to retrieve email messages from a mail server.
POP3 is designed to delete mail on the server as soon as the user has
downloaded it. However, some implementations allow users or an administrator
to specify that mail be saved for some period of time. POP can be thought of as a
"store-and-forward" service.
An alternative protocol is Internet Message Access Protocol (IMAP). IMAP
provides the user with more capabilities for retaining e-mail on the server and
for organizing it in folders on the server. IMAP can be thought of as a remote
file server.
POP and IMAP deal with the receiving of e-mail and are not to be confused with
the Simple Mail Transfer Protocol (
SMTP). You send e-mail with SMTP, and a
mail handler receives it on your recipient's behalf. Then the mail is read using
POP or IMAP. IMAP4 and POP3 are the two most prevalent Internet standard
protocols for e-mail retrieval. Virtually all modern e-mail clients and servers
support both.
PPPoE
PPPoE is an acronym for Point-to-Point Protocol over Ethernet.
It is a network protocol for encapsulating Point-to-Point Protocol (PPP) frames
inside Ethernet frames. It is used mainly with ADSL services where individual
users connect to the ADSL transceiver (modem) over Ethernet and in plain
Metro Ethernet networks (Wikipedia).
Private VLAN
In a private VLAN, communication between ports in that private VLAN is not
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