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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 can be configured as a private VLAN.
Q
QCE
QCE
is an acronym for QoS Control Entry. It describes
QCE ID.
There are six QCE frame types:
Priority. Frames can be classified by one of 4 different QoS classes: "Low", "Normal",
"Medium", and "High" for individual application.
QCL
QCL
is an acronym for QoS Control List. It is the list table of QCEs, containing
entries that classify to a specific QoS class on specific traffic objects.
Each accessible traffic object contains an identifier to its QCL. The privileges determine
specific traffic object to specific QoS class.
QL
QL
In
SyncE
SSM
indicating the quality of the clock received in the port.
QoS
QoS
is an acronym for Quality of Service. It is a method to guarantee a bandwidth relationship
between individual applications or protocols.
Ethernet
this is the Quality Level of a given clock source. This is received on a port in a
QoS
class associated with a particular
Type, VLAN,
UDP/TCP
-140-
VLAN
is not permitted. A
Port, DSCP, TOS, and
QoS
Tag
control
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