Network security
Network security

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Network security

1.2 Abbreviations

The table below shows the abbreviations that are used throughout this unit, and their meanings.

Table 1 Abbreviations

ADSLasymmetric digitalPGPPretty Good Privacy
subscriber linePINGpacket internet groper
DESData Encryption StandardPSTNpublic switched telephone
DMZdemilitarised zonenetwork
DNSdomain name systemRC2Rivest cipher 2
DSSDigital Signature StandardRC4Rivest cipher 4
FTPfile transfer protocolRSARivest, Shamir and
IANAInternet Assigned NumbersAdleman block cipher
AuthorityS-HTTPsecure hypertext transfer
ICMPinternet control messageprotocol
protocolS/MIMEsecure/multipurpose internet
IDEAInternational Datamail extensions
Encryption AlgorithmSETsecure electronic transaction
IPinternet protocolSHAsecure hash algorithm
IPSecinternet protocol securitySIMsubscriber identity module
ISDNintegrated services digitalSMTPsimple mail transfer
ISOInternational OrganizationTCPtransmission control
for Standardizationprotocol
LANlocal area networkUDPuser datagram protocol
MD5message digest 5VPNvirtual private network
MSPmessage security protocolXORexclusive-OR
NSANational Security Agency3DESTriple Data Encryption
OSIopen systemsStandard

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371