1127| Glossary of Terms AOS-W 6.5.3.x| User Guide
enhance the quality and reliability of streaming videos, while preserving the bandwidth available to non-video
clients.
DES
Data Encryption Standard. DES is a common standard for data encryption and a form of secret key
cryptography, which uses only one key for encryption and decryption.
designated router
Designated router refers to a router interface that is elected to originate network link advertisements for
networks using the OSPF protocol.
destination NAT
Destination Network Address Translation. Destination NAT is a process of translating the destination IP
address of an end route packet in a network. Destination NAT is used for redirecting the traffic destined to a
virtual host to the real host, where the virtual host is identified by the destination IP address and the real host
is identified by the translated IP address.
DFS
Dynamic Frequency Selection. DFS is a mandate for radio systems operating in the 5 GHz band to be
equipped with means to identify and avoid interference with RADAR systems.
DFT
Discrete Fourier Transform. DFT converts discrete-time data sets into a discrete-frequency representation.
See FFT.
DHCP
Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP
address to an IP-enabled device from a defined range of numbers configured for a given network.
DHCP snooping
DHCP snooping enables the switch to monitor and control DHCP messages received from untrusted devices
that are connected to the switch.
digital certificate
A digital certificate is an electronic document that uses a digital signature to bind a public key with an
identity—information such as the name of a person or an organization, address, and so forth.
Digital wireless pulse
A wireless technology for transmitting large amounts of digital data over a wide spectrum of frequency bands
with very low power for a short distance. Ultra Wideband radio can carry a huge amount of data over a
distance up to 230 ft at very low power (less than 0.5 mW), and has the ability to carry signals through doors
and other obstacles that tend to reflect signals at more limited bandwidths and a higher power.
Disconnect-Ack
Disconnect-Ack is a NAS response packet to a Disconnect-Request, which indicates that the session was
disconnected.
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