Allworx PowerFlex P810, Руководство пользователя

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PowerFlex
8/24/48 Port GbE PoE Managed Switch User’s Guide
Term Definition
Aggregation
Using multiple ports in parallel to increase the link speed beyond the limits of
a port and to increase the redundancy for higher availability.
(Also Port Aggregation, Link Aggregation)
ARP
An acronym for Address Resolution Protocol. It is a protocol used to convert
an IP address into a physical address, such as an Ethernet address. ARP
permits a host to communicate with other hosts when only the Internet
address of its neighbors is known. Before using IP, the host sends a
broadcast ARP request containing the Internet address of the desired
destination system.
ARP Inspection
A secure feature. Several types of attacks can be launched against a host or
devices connected to Layer 2 networks by "poisoning" the ARP caches. Use
this feature to block such attacks. Only valid ARP requests and responses
can go through the switch device.
Auto-Negotiation
The process where two different devices establish the mode of operation and
share the speed settings by those devices for a link.
C
CC
An acronym for Continuity Check. It is a MEP functionality able to detect loss
of continuity in a network by transmitting CCM frames to a peer MEP.
CCM
An acronym for Continuity Check Message. It is a OAM frame transmitted
from a MEP to it's peer MEP and used to implement CC functionality.
CDP
An acronym for Cisco Discovery Protocol.
D
DEI
An acronym for Drop Eligible Indicator. It is a 1-bit field in the VLAN tag.
DES
An acronym for Data Encryption Standard. It provides a complete description
of a mathematical algorithm for encrypting (enciphering) and decrypting
(deciphering) binary coded information.
Encrypting data converts it to an unintelligible form called cipher. Decrypting
cipher converts the data back to its original form called plaintext. The
algorithm described in this standard specifies both enciphering and
deciphering operations, which are based on a binary number called a key.
DHCP
An acronym for Dynamic Host Configuration Protocol. It is a protocol used for
assigning dynamic IP addresses to devices on a network.
DHCP used by networked computers (clients) to obtain IP addresses and
other parameters such as the default gateway, subnet mask, and IP
addresses of DNS servers from a DHCP server.
The DHCP server ensures that all IP addresses are unique, for example, no
IP address is assigned to a second client while the first client's assignment is
valid (its lease has not expired). IP address pool management is done by the
server and not by a human network administrator.
Dynamic addressing simplifies network administration because the software
tracks IP addresses rather than requiring an administrator to manage the
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Revised: October 30, 2013
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