User manual

Publication date: Feb., 2013
Revision A3
265
Using multiple ports in parallel to increase the link speed beyond the limits of a port and to
increase the redundancy fo
r higher availability.
(Also Port Aggregation, Link Aggregation).
ARP
ARP is an acronym for Address Resolution Protocol. It is a protocol that used to convert an IP
address into a physical address, such as an Ethernet address. ARP allows 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
ARP Inspection is 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. This feature is
used to block such attacks. Only valid ARP requests and responses can go through the switch
device.
Auto-Negotiation
Auto-negotiation is the process where two different devices establish the mode of operation
and the speed settings that can be shared by those devices for a link.
C
CC
CC is an acronym for Continuity Check. It is a MEP functionality that is able to detect loss of
continuity in a network by transmitting CCM frames to a peer MEP.
CCM
CCM is an acronym for Continuity Check Message. It is an OAM frame transmitted from a
MEP to its peer MEP and used to implement CC functionality.
CDP
CDP is an acronym for Cisco Discovery Protocol.
D
DEI
DEI is an acronym for Drop Eligible Indicator. It is a 1-bit field in the VLAN tag.
DES
DES is 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
DHCP is 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