Glossary of Terms 273
DDR (1): Dial-on-demand routing
DDR (2): Dual data rate RAM
DES: Data Encryption Standard
DHCP: Dynamic Host Configuration Protocol
DIMM: Dual Inline Memory Module
DIX: Digital-Intel-Xerox
DLC: Data Link Control
DLCI: Data Link Connection Identifier (Frame Relay)
DMT: Discrete multi-tone
DMZ: Demilitarized zone
DNA SCP: Digital Network Architecture Session Control Protocol (DECnet)
DNIC: Data Network Identification Code (X.25)
DNS: Domain Name Server
DQDB: Distributed Queue Dual Bus (SMDS)
DR: Designated router
DRAM: Dynamic random access memory
DRP: Disaster recovery plan
DS-0: Digital Signal Level 0 (64 kb)
DS-1: Digital Signal Level 1 (1.544 Mb)
DS-3: Digital Signal Level 3 (45 Mb)
DSA: Digital Signature Algorithm
DSAP: Destination Service Access Point (LLC)
DSE: Data switching equipment
DSL: Digital Subscriber Line
DSR: Data set ready
DSS (1): Digital Subscriber Signaling System 1
DSS (2): Digital Signature Standard
DSU: Data service unit
DTE: Data terminal equipment
DTR: Data terminal ready
DUAL: Diffused update algorithm (EIGRP)
EBCDIC: Extended Binary Encoded Decimal Interchange Code
EBGP: Exterior Border Gateway Protocol
ECC: Elliptic curve cryptography
EDI: Electronic data interchange
EEPROM: Electrically erasable programmable read-only memory
EGP: Exterior Gateway Protocol
EIA: Electronic Industries Association
EIGRP: Enhanced Interior Gateway Routing Protocol
EMF: Electromagnetic field
EMI: Electromagnetic interference
EMP: Electromagnetic pulse
EOT: End of transmission
EPROM: Erasable programmable read-only memory
ERP: Emergency response plan
ESF: Extended Super Framing (T1/E1)
ESP: Encapsulated Secure Payload
ET: Exchange termination
ETSI: European Telecommunication Standards Institute
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