- NA
- Network Administrator
- NAS
- Network Attached Storage
- NAT
- Network Address Translation
- NCES
- Net Centric Enterprise Services
- NCTC
- Navy Transformational Communications Terminal
- Need to Know
- A way for the US Government to limit the exposure of classified information when more than one person has the same level of clearance.
- NES
- Network Encryption System
- NetOps
- An operational construct that the Commander, US Strategic Command will use to operate and defend the Global Information Grid (GIG). (DISA)
- NexCore
- Next Secure Software Core
- NIC
- Network Interface Card
- NIPRNET
- Unclassified but sensitive internet protocol router network
- NMT
- Navy Multi-band Terminal
- NORFORN
- No Foreign Nationals
- NSA
- National Security Agency
- NSAP
- Network Service Access Point
- NSN
- National Stock Number
- O/S
- Operating System
- OAM
- Operations, Administration and Maintenance
- OC
- Optical Carrier
- OC-12c
- Optical Carrier Level 12 (single 622 Mbps channel)
- OC-192
- Optical Carrier Level 192
- OC-192c
- Optical Carrier Level 192 (single 9.952 Gbps channel)
- OC-3c
- Optical Carrier Level 3 (single 155 Mbps channel)
- OC-48c
- Optical Carrier Level 48 (single 2.488 Gbps channel)
- ORS
- Operationally Responsive Space
- OS
- Operating System
- OSD
- Operational Security Doctrine
- OSHA VPP
- Occupational Safety & Health Administration Voluntary Protective Programs
- OSI
- Open System Interconnect
- OSPF
- Open Shortest Path First
- OTN
- Over-the-Network
- OTNK
- Over-the-Network Keying
- PA
- Platform Administrator
- PAC
- Positive Access Control
- PACOM
- U.S. Pacific Command
- PC
- Personal Computer
- PCE
- Programmable Cryptographic Engine
- PCI
- Peripheral Component Interconnect
- PCMCIA
- Personal Computer Memory Card International Association
- PDA
- Personal Digital Assistant
- PDU
- Protocol Data Unit
- PEP
- Performance Enhancing Proxy
- PHY
- Physical (Layer)
- PIAO
- Platform Information Assurance Officer
- PIN
- Personal Identification Number
- PKE
- Public Key Enabling
- PKI
- Public Key Infrastructure
- PL
- Protection Level
- PMO
- Program Management Office
- PMTUD
- Path Maximum Transmission Unit
- PNNI
- Private Network / Network Interface
- POET
- Programmable Objective Encryption Technology
- POS
- Packet Over SONET
- POSIX
- Portable Operating System Interface
- PP TEK
- Pre-Placed Traditional Encryption Key
- PPK
- Pre-Placed Key
- PRONAV
- Protection of Navigation
- PRSN
- Primary Services Node
- PSEQ
- Packet Sequence Number
- PSEQN
- Packet Sequence Number
- PSN
- Product Source Node
- PSO
- Platform Security Officer
- PSTN
- Public Switched Telephone Network
- PT
- Plain Text
- PTI
- Payload Type Indicator
- PTT
- Push-to-talk control
- PU
- Platform User
- PVC
- Private Virtual Circuit
- PVP
- Private Virtual Path
- PWA
- Printed Wiring Assembly
- PWB
- Printed Wiring Board
- P^3
- Programmable PACing Privileges
- QoS
- Quality of Service
- QVGA
- Quarter Video Graphics Array
- RAID
- Redundant Array of Independent Disks
- RBAC
- Role-based Access Control
- RCS
- Remote Configuration Source
- RCV
- Receive
- RECIPE
- Remote Encryptor Configuration Information Protocol
- RFC 2406
- Request for Comments
- RHEL
- Red Hat Enterprise Linux
- RI
- Remote Interface
- RIMS
- Remote Intelligence Monitoring System
- RIPng
- Routing Information Protocol Next Generation
- RIPV2
- Routing Information Protocol Version 2
- RM Filter
- Resource Management Filter
- ROHC
- Robust Header Compression
- ROI
- Return on Investment
- RPP
- Red Pre-Processor
- RRK
- Remote Rekey Modernization
- RS 232
- DB-25 Serial Connection
- RTC
- Real Time Clock
- RTE
- Route
- RTOS
- Real-time Operating System
- RTP
- Real Time Protocol - an IETF standard
- RTT
- Remote Tasking Terminal
- S.P.I.E.
- Space Programmable INFOSEC Engine
- S/D
- Source / Destination
- S/N
- Serial Number
- SA
- Security Association; Security Administrator
- SADL
- Situational Awareness Data Link
- SAMP
- Security Association Management Protocol
- SAN
- Storage Area Network
- SAT
- Satellite
- SATA
- Serial ATA
- SATCOM
- Satellite Communications
- SBU
- Sensitive But Unclassified
- SCC
- Single Chip Crypto
- SCCP
- Skinny Call Control Protocol
- SCI
- Sensitive Compartmented Information
- SCIF
- Sensitive Compartmented Information Facility
- SCIP
- Secure Communication Interoperability Protocol
- Scrambler
- A device inverts or transposes signals regarding a message at the transmitter to make the message unintelligible at the receiver unless set with the appropriate set descrambler.
- SCSI
- Small Computer System Interface
- SDD
- Secure Dynamic Discovery
- SDH
- Synchronous Digital Hierarchy
- SDIO
- Secure Digital Input Output
- SDNS
- Secure Data Network System
- SDP
- Software Development Plan
- SDR
- Software Defined Radio
- SDS
- Secure DTD2000 System
- SEI SWCMM
- Software Engineering Institute - Software Capability Maturity Model
- SFE
- Secure Front End
- SFUG
- Security Features User's Guide
- SFX
- Super Fast Encryption (implementation of POET technology)
- Simple Network Management Protocol (SNMP)
- An application layer protocol which facilities the exchange of management information between network devices. It is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP enables network administrators to manage network performance, find and solve network problems, and plan for network growth. (Cisco)
- SINCGARS
- Single Channel Ground and Airborne Radio System
- SIP
- Session Internet Protocol
- SIPRNet
- Secret Internet Protocol Network
- Situational Awareness (SA)
- The ability to identify, process, and comprehend the critical elements of information about what is happening to the team with regards to the mission. More simply, it is knowing what is going on around you.
- SKL
- Simple Key Loader
- SM
- Single Mode
- SMA
- Security Management Agent
- SME PED
- Secure Mobile Environment Portable Electronic Device
- SNA/P
- Secure Network Architecture/Processor
- SNMP
- Simple Network Management Protocol
- SOA
- Service-Oriented Architecture
- SOCOM
- U.S. Special Operations Command
- SONET
- Synchronous Optical Network
- SP
- Security Processor
- SPE
- Synchronous Payload Envelope
- SPI
- Security Parameter Index
- SPK
- Single Point Keying
- SPST
- Single Pole, Single Throw
- SRW
- Soldier Radio Waveform
- SSL
- Secure Sockets Layer
- SSO
- System Security Officer/Site Security Officer
- STANAG
- Standardization Agreement
- STE
- Secure Terminal Equipment
- STS
- Synchronous Transport Signal
- STU
- Secure Telephone Unit
- SVC
- Switched Virtual Circuit/Connection
- SVGA
- Super Video Graphics Array
- SVN
- Secure Virtual Network
- SVoIP
- Secure Voice over IP
- SVP
- Switched Virtual Path
- SWAP
- Size, Weight And Power
- SWDL
- Software Download
- SWT
- Sectéra Wireline Terminal