|
|
VPN ==>
Virtual Private Network
<networking, security> (VPN) The use of encryption in the
lower protocol layers to provide a secure connection through
an otherwise insecure network, typically the Internet. VPNs
are generally cheaper than real private networks using private
lines but rely on having the same encryption system at both
ends. The encryption may be performed by firewall software
or possibly by routers.
Link-level (layer 2 and 3) encryption provides extra
protection by encrypting all of each datagram except the
link-level information. This prevents a listener from
obtaining information about network structure. While
link-level encryption prevents traffic analysis (a form of
attack), it must encrypt/decrypt on every hop and every
path.
Protocol-level encryption (layer 3 and 4) encryption encrypts
protocol data but leaves protocol and link headers clear.
While protocol-level encryption requires you to
encrypt/decrypt data only once, and it encrypts/decrypts only
those sessions that need it, headers are sent as clear text,
allowing traffic analysis.
Application (layer 5 up) encryption is based on a particular
application and requires that the application be modified to
incorporate encryption.
Cisco.
(1999-11-15)
Try this search on OneLook / Google
Nearby terms:
virtual path « virtual point of presence « virtual PoP « Virtual Private Network » virtual reality » Virtual Reality Modeling Language » Virtual Sequential Access Method
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
NEW Sempron 2200+ 256MB DDR 40GB CDRWNEW Sempron 2200+ 256MB DDR 40GB CDRW ** NEW Sempron 2200+ 256MB DDR 40GB CDRW **This system features an AMD Sempron 2200+ processor, a 40GB 7200RPM hard drive, 256MB of DDR RAM, and sports a 52X32X52 CD-RW drive.General Features:- AMD Sempron 2200+ processor- 333MHz Front Side Bus- 256MB DDR Memory- 40GB 7200RPM IDE Hard Drive- 52X32X52 CD-RW Drive- S3 UniChrome 2D/3D Graphics with motion compensation with up to 64MB shared memory - Realtek ALC655 6-Channel audio - 56K V.90 Data/Fax Modem- Integrated 10/100 Ethernet- Standard Size ATX Power SupplyMotherboard Features:- VIA KM400 (NB), VT8235CE (SB) Chipset- One (1) AGP 8X Slot for Graphics upgrades- Two (2) PCI slots- One (1) CNR Slot (occupied by modem)I/O Ports:- Two (2) PS/2 Ports, one for mouse, one for keyboard- One (1) Standard DB-15 VGA Connector- One (1) Standard 25-pin Parallel Port Connector- One (1) Standard 9-pin Serial Port Connector- Six (6) Standard USB 2.0 Ports (Two on front, four on rear)- One (1) Standard RJ-45 10/100 Ethernet Port- Line-in, Phone-out RJ-11 Jacks on PCI Modem-Line-in, Mic-in, Line-out 3.5mm mini-jacksPackage Includes:-Amptron Sempron 2200+ System- PS/2 Keyboard and Scroll Mouse- Driver Disc- Panda AntiVirus Software- FaxTalk Communicator Software- Adobe Reader- RJ-11 Phone Cable for Modem- Amplified Stereo Speakers - Amptron ECS KM400-M2 Motherboard manual- U.S. Style Power CordCompatibility/Requirements/Disclosures:** Requirements *** Operating system (WinXP,2000,98,etc.)* VGA monitor* Power outlet More ...
Diskeeper 9.0 - CD OnlyDiskeeper 9.0 - CD Only ** Diskeeper 9.0 - CD Only **Disk fragmentation causes crashes, slowdowns, freeze-ups and even total system failures. Manual defragmentation just isn’t practical—it takes too long. NEW Diskeeper 9 is the “Set It and Forget It”high-speed defragmenter that runs undetectably in the background and makes the problems of fragmentation go away forever!Diskeeper is packed with features and new technology that keep your systems running at top speed and protect critical system files, ensuring like-new levels of performance. Your systems can perform like new again—get Diskeeper 9 and see!Notes:- OEM CD ONLY- Picture is for representational purposes More ...
52x 700MB CD-R Media 100-Pack - 2 for $2252x 700MB CD-R Media 100-Pack - 2 for $22 ** 52x 700MB CD-R Media 100-Pack - 2 for $22 **This 100-pack CD-R media makes burning discs easy! Featuring 700 MB data storage, 80 minutes of digital audio and a maximum 52x recording speed, disc creationonly takes minutes! General Features:- 80-minute audio capacity- 700 MB data capacity- Rated for use with 52x speeds - White labelNotes:- (2) 100-piece packs Compatibility/Requirements/Disclosures:** Requirements *** CD-R/RW drive More ...
Maxtor 40GB UDMA/133 7200RPM 2MB IDE HDDMaxtor 40GB UDMA/133 7200RPM 2MB IDE HDD DiamondMax Plus 8 blends performance and value in an ATA hard drive. This drive is the perfect combination for the mainstream consumer or commercial user. Offered in a 40GB capacity, the DiamondMax Plus 8 is equipped with fluid dynamic bearing motors. This technology minimizes the noise of the drive, which is especially important in personal video recorder applications. This fast performer at 7200 RPM and fast Ultra ATA 133 interface is the most reliable and robust single-head/single platter hard drive on the market.General Features:- Capacity: 40GB- Interface: Ultra ATA-133 - Spindle Speed: 7200RPM - Buffer Memory: 2MB - Average Seek: 9.5ms- Data Transfer Rate 133 MBps - Form Factor: 3.5 x 1/3H Compatibility/Requirements/Disclosures:** Requirements *** IDE cable * IDE controller * Available 3.5-inch drive bay * Available 4-pin power connector More ...
Intel PIII Xeon 900 MHz 100MHz 2MB Slot 2 CPUIntel PIII Xeon 900 MHz 100MHz 2MB Slot 2 CPU ** Intel Pentium III Xeon Processor at 900 MHz **This Intel Pentium III processor is designed for mid-range and higher server and workstations. It includes an integrated passive heatsink to assist the integrator in proper thermal managementof the processor.General Features:- 900 MHz- 100 MHz system bus- 2 MB full speed L2 cache- Supports Multi-processing- 2.8v Input Voltage- Slot 2 CPU- Streaming SIMD Extensions- Attached Passive Heat Sink- Extended Server Memory Architecture- S-Spec: SL5D3Retail Box Includes:- Pentium III Xeon 900 MHz CPU- Attached Heat SinkNotes:- EAN: 5 032037 002240- UPC: 7 35858 14518 3 Compatibility/Requirements/Disclosures:** Requirements *** Motherboard that supports PIII Xeon 900 MHz CPUs More ...
Midnight NowhereMidnight Nowhere Prepare to enter an immersive world rich in atmosphere. In this suspenseful, story-driven adventure you will solve numerous puzzles and battle creatures of the dark to reveal the ultimate mystery. Windows 98/ME/2000/XP More ...
|
