User’s Manual of NS3601-24P/4S Series
395
ARP
ARP is an acronym for
A
ddress
R
esolution
P
rotocol. 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
C
ontinuity
C
heck. 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
C
ontinuity
C
heck
M
essage. It is a OAM frame transmitted from a MEP to it's peer MEP and
used to implement CC functionality.
CDP
CDP is an acronym for
C
isco
D
iscovery
P
rotocol.
D
DEI
DEI is an acronym for
D
rop
E
ligible
I
ndicator. It is a 1-bit field in the VLAN tag.
DES
DES is an acronym for
D
ata
E
ncryption
S
tandard. 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
D
ynamic
H
ost
C
onfiguration
P
rotocol. 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). Therefore, IP address pool management is done
by the server and not by a human network administrator.
Summary of Contents for GE-DSSG-244
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