HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 729

Appendix B: Glossary
ACP Access Control Policy. An ACP filters the traffic that arrives on an interface,
either dropping the traffic selected by an ACL or allowing that traffic to pass.
Address and An LCP option that allows peers to compress the address and control fields
Control Field in PPP frames and thus minimize overhead. These fields have static values
Compression and are easily compressed.
ADPCM Adaptive Differential Pulse Code Modulation. A technique for converting
sound or analog information to binary information by taking frequent samples
of the sound and expressing the value in binary terms. Used to convert analog
so that it can be sent over DS0, E0, and J0 channels.
ADSL Asymmetric Digital Subscriber Line. A form of DSL that runs on a single pair
of wires. Like DSL, ADSL supports the two-way transmission of data over
voice lines. However, ADSL is asymmetrical: more bandwidth is reserved for
downstream traffic, so data transfer speeds are quicker than upstream data
transfer speeds.
ADSL2 ADSL with improved modulation, signal processing and initialization. ADSL2
has faster downstream rates, supports longer distances over the local loop,
and uses less power than ADSL. ADSL2 can run on existing ADSL equipment.
ADSL2+ ADSL2 with double the downstream speed and the ability to increase the
upstream speed. ADSL2+ doesn't suffer from the crosstalk problem of ADSL2.
ProCurve supports ADSL2+, which provides up to 25 Mbps downstream and
1.5 Mbps upstream data rates. ADSL2+ also reserves channels for analog voice
on the local loop (Annex A) or for digital voice over ISDN (Annex B).
AES Advanced Encryption Standard. One of the encryption algorithm used by
IPSec to transform data sent over a VPN tunnel. AES is a symmetric algorithm,
which means that the encryption key is the same of the decryption key, and it
works on multiple OSI Layers simultaneously. A block-cipher, AES supports
128-, 192-, and 256-bit keys.
AF Assured Forwarding. In a Frame Relay network, AF is a DiffServ PHB group
that allows delivery of packets in up to four independently forwarded traffic
classes. These classes are denoted as AF1, AF2, AF3, and AF4. For more
information on Assured Forwarding, see RFC 2597 (at http://www.ietf.org/rfc/
rfc2597.txt).
Aggressive Mode A mode of Internet Key Exchange (IKE) that compresses the six exchanges
typically necessary for negotiating an IKE Security Association (SA) into only
three exchanges. Because peers must send their authentication data before
exchanges are encrypted, aggressive is less secure, though quicker and less
processor-intensive than main mode. See also IKE.
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