`
`Network Dictionary: Safari Books Online
`
`Favorites & Folders
`
`Bookmarks
`
`Notes & Tags
`
`Reviews
`
`Help
`
`William MangioneSmith
`
`Network Dictionary
`By: Javvin Technologies, Inc.
`Publisher: Javvin Press
`Pub. Date: May 15, 2007
`Pages in Print Edition: 560
`Subscriber Rating:
`My Rating:
`Popular Tags: None Yet
`
` [0 Ratings]
`
`Overview
`
`Table of
`
`Notes
`
`Bookmarks
`
`Search This
`
`Table of Contents
`
`
`
`Copyright
`
`Part I: Preface
`
`Part II: Network Dictionary
`
`Chapter 2.1. #
`
`Chapter 2.2. A
`
`Chapter 2.3. B
`
`Chapter 2.4. C
`
`Chapter 2.5. D
`
`Chapter 2.6. E
`
`Chapter 2.7. F
`
`Chapter 2.8. G
`
`Chapter 2.9. H
`
`Chapter 2.10. I
`
`Chapter 2.11. J
`
`Chapter 2.12. K
`
`Chapter 2.13. L
`
`Chapter 2.14. M
`
`Chapter 2.15. N
`
`Chapter 2.16. O
`
`Chapter 2.17. P
`
`Chapter 2.18. Q
`
`Chapter 2.19. R
`
`Chapter 2.20. S
`
`Chapter 2.21. T
`
`Chapter 2.22. U
`http://my.safaribooksonline.com/book/networking/network-management/9781602670006
`
`1/2
`
`Entire Site
`
`Rosetta-2025
`
`0001
`
`
`
`11/28/2016
`
`Network Dictionary: Safari Books Online
`
`Chapter 2.23. V
`
`Chapter 2.24. W
`
`Chapter 2.25. X
`
`Chapter 2.26. Y
`
`Chapter 2.27. Z
`
`Part III: Appendices
`
`Appendix I. TCP and UDP Port Numbers
`
`Appendix II. Top Level Domains
`
`Appendix III. Country Calling Codes
`
`http://my.safaribooksonline.com/book/networking/network-management/9781602670006
`
`2/2
`
`Rosetta-2025
`
`0002
`
`
`
`11/28/2016
`
`Network Dictionary > Network Dictionary > D : Safari Books Online
`Downstream (Networking) In Internet access, from the user’s
`perspective, downstream refers to traffic handled at the service provider
`end and terminating to the customer. In other words, downstream traffic
`flows to the user’s computer. On the other hand, upstream network traffic
`flows away from the local computer toward the remote destination. Traffic
`on most networks flows in both upstream and downstream directions
`simultaneously.
`
`Downstream Physical Unit (Networking) Downstream Physical Unit
`(DSPU), a term in the IBM SNA, is a PU that is located downstream from
`the host.
`
`Doxygen (Software) Doxygen is a Documentation generator for C++, C,
`Java, IDL (Corba and Microsoft flavors) and to some extent ObjectiveC,
`PHP, C# and D. Being highly portable, it runs on most Unix systems as well
`as on Windows and Mac OS X. Most of the Doxygen code was written by
`Dimitri van Heesch.
`
`DPAPI (Security) See Data Protection API.
`
`DPCCH (Wireless) See Dedicated Physical Control Channel.
`
`DPCM (Telecom) See Differential PulseCode Modulation.
`
`DPMI (Hardware) See DOS Protected Mode Interface.
`
`DPMO (Networking) See Defects Per Million Opportunites.
`
`DPMS (Hardware) See Display Power Management Signaling.
`
`DPSK (Telecom) See Differential Phase Shift Keying.
`
`DQDB (Networking) See Distributed Queue Dual Bus.
`
`DQPSK (Wireless) See Differential Quadrature Phase Shift Keying.
`
`DRAM (Hardware) See Dynamic Random Access Memory.
`
`DRARP (Networking) See Dynamic Reverse Address Resolution
`Protocol.
`
`Drawing Program (Software) Drawing program allows a user to draw
`freehand and create complex graphics. It may include features such as
`special fonts, clip art, or painting facilities that allow a user to simulate on
`the computer the drawing characteristics of specific realworld implements
`such as charcoal, watercolours, or pastels. For example, Corel Draw and
`Adobe Illustrator are drawing programs.
`
`DRDA (Software) See Distributed Relational Database Architecture.
`
`Dreamweaver (Software) Dreamweaver is an HTML editor developed by
`Macromedia, now part of Adobe Systems. It was originally designed for
`professional web designers and offers an editing system that combines both
`the productivity of WYSIWYG design with the control of HTML code editing
`mode. This combination was quite unique in late 1990s and helped
`Dreamweaver to a widespread adoption. It is currently available for Mac
`and Windows and holds about 80% of the professional HTML editor market.
`
`Dribbleware (Software) Dribbleware refers to the Software which is
`prematurely released with frequent update, fixes, and patches after
`release. With the intense market pressure to release Software products as
`soon as possible, and with the increased ease of updating Software via
`Internet downloads, dribbleware is becoming the norm rather than the
`exception.
`
`Drift (Telecom) Drift is a term in Telecommunication system that is a
`comparatively longterm change in an attribute or value of a system or
`equipment operational parameter. Drift is usually undesirable and
`unidirectional, but may be bidirectional, cyclic, or of such a longterm
`duration and low excursion rate as to be negligible. The drift can be
`characterized as “diurnal frequency drift” and “output level drift”.
`
`http://my.safaribooksonline.com/book/networking/network-management/9781602670006/network-dictionary/par02ch20?percentage=0&reader=html#X2ludGVyb… 51/60
`
`Rosetta-2025
`
`0003
`
`
`
`11/28/2016
`
`Network Dictionary > Network Dictionary > S : Safari Books Online
`the central processing unit (CPU) and peripheral devices. It is also possible
`to connect two microprocessors by means of SPI.
`
`Serial Port (Hardware) Serial port, also known as serial interface, is a
`port on the computer that transmits data in serial form (bit by bit), as
`opposed to a parallel interface which sends a number of bits at the same
`time. Within the computer, data is transmitted over parallel lines. The serial
`interface converts data from a parallel to a serial form for sending to the
`serial devices such as a modem, mouse, scanner or some serial priners.
`
`Serial Transmission (Networking, Telecom) Serial Transmission is a
`method of data transmission in which the bits of a data character are
`transmitted sequentially over a single channel.
`
`Serial Tunnel (Networking) Serial Tunnel (STUN), a feature in Cisco
`routers, allowing two SDLC or HDLCcompliant devices to connect to one
`another through an arbitrary multiProtocol topology (using Cisco routers)
`rather than through a direct serial link. STUN encapsulates SDLC frames in
`either the Transmission Control Protocol/Internet Protocol (TCP/IP) or the
`HDLC Protocol. STUN provides a straight passthrough of all SDLC traffic
`(including control frames, such as Receiver Ready) endtoend between
`Systems Network Architecture (SNA) devices.
`
`Serialization Packet (Networking, Protocol) Serialization packet (SER),
`a Protocol in the Novell NetWare suite, ensures that a single version of
`NetWare is not being loaded on multiple servers. Novell Protocol
`
`Serpent (Security) Serpent is a symmetric key block cipher which was a
`finalist in the Advanced Encryption Standard contest, where it came second
`to Rijndael. Serpent was designed by Ross Anderson, Eli Biham, and Lars
`Knudsen. Serpent has a block size of 128 bits and supports a key size of
`128, 192 or 256 bits. The cipher is a 32round substitutionpermutation
`network operating on a block of four 32bit words.
`
`Server (Hardware) Server is a computer or other network device that
`stores all necessary information and is dedicated to provide a particular
`service. For example, a database server would store all data and Software
`related to a certain database and allows other network devices to access
`and process database queries. A file server is a computer and storage
`device dedicated to storing files for any user on the network to store files
`on the server. A print server is a device that manages one or more printers,
`and a network server is a computer that manages network traffic.
`
`Server Accelerator Card (Security) A server accelerator card, also
`known as an SSL card, is a Peripheral Component Interconnect (PCI) card
`used to generate encryption keys for secure transactions on ecommerce
`Web sites. When a secure transaction is initiated, the Web site’s server
`sends its certificate, which has been provided by a certifying authority, to
`the client machine to verify the Web site’s authenticity. After this exchange,
`a secret key is used to encrypt all data transferred between sender and
`receiver so that all personal and credit card information is protected.
`
`Server Address (Networking) A server address is a number or string of
`characters uniquely identifying an interface to a networked computer that
`provides one or more services. A server address can be a numeric IP
`address on private networks or on the Internet, although humanfriendly
`names consisting of alphanumeric characters can also be given. The
`humanfriendly names are then converted into the numeric addresses that
`computers understand by other servers dedicated to that purpose called
`“DNS servers” (DNS:Domain Naming System). Naturally, a DNS server
`cannot have an alphanumeric address.
`
`Server Application (Software) Server applications are a type of
`Software used by an application server in providing a service to a client.
`Server applications include web service applications, database applications,
`etc.
`
`Server Blade (Hardware) Server blade, also known as blade server, is a
`collection of a number of individual minimallypackaged computer
`motherboard “blades”, each including one or more processors, memory,
`storage, and network connections, but sharing the common power supply
`http://my.safaribooksonline.com/book/networking/network-management/9781602670006/network-dictionary/par02ch20?percentage=0&reader=html#X2ludGVyb… 17/86
`
`Rosetta-2025
`
`0004
`
`
`
`11/28/2016
`
`Network Dictionary > Network Dictionary > U : Safari Books Online
`Upgrade (Software) An upgrade, in computer industry, refers to a new
`version of a Software or Hardware product designed to replace an older
`version of the same product. Sometimes, upgrade means a better version
`such as a professional version with more functionalities and better
`performance to replace a lighter version of the same product.
`
`Upgrade SIM (Wireless) See Universal Subscriber Identity Module.
`
`Uplink (Wireless) Uplink (UL) is the transmission path from the mobile
`station up to the base station.
`
`Uplink Channel Descriptor (Wireless) Uplink Channel Descriptor (UCD)
`is a concept in the IEEE 802.16 (WiMAX) network, which describes the
`uplink burst profile (i.e., modulation and coding combination) and preamble
`length for each UL burst.
`
`Upload (Networking) Upload is the process of sending a copy of a file to
`a remote network location. For example, when you send an email with
`attachments through an email client Software, the email client needs to
`upload the files to the email server first. The opposite is download.
`
`UPnP (Hardware) See Universal Plug and Play.
`
`UpperLayer Protocol (Networking) Upperlayer Protocol (ULP) typically
`refers to the Protocols that operate at the top layers in the OSI reference
`model, such as layers 47. ULP is sometimes used to refer to the next
`highest Protocol (relative to a particular Protocol) in a Protocol stack.
`
`UPS (Hardware) See Uninterruptible Power Supply.
`
`Ups Debugger (Software) Ups debugger is an opensource debugger
`developed in the late 1980s for Unix and Unixlike systems. It supports C
`and C++, and Fortran on some platforms. Unlike more popular debugger
`stacks for these platforms, ups is completely selfcontained not merely a
`graphical frontend to lowerlevel debuggers like gdb (although some work
`has been done to make ups usable in that way). The ups user interface is
`built directly upon the X Window System and SunView, i.e., it does not use
`an intermediate toolkit such as Motif or GTK+.
`
`UPSR (Networking) See Unidirectional Path Switched Ring.
`
`Upstream (Networking) Upstream refers to the data flow direction from
`an individual user’s station to the core network. For example, from the
`user’s perspective, upstream network traffic flows away from the local
`computer toward the remote destination. Conversely, downstream traffic
`flows to the user’s computer. Traffic on most networks flows in both
`upstream and downstream directions simultaneously.
`
`UPT (Telecom) See Universal Personal Telecommunications.
`
`Upward Compatible (Software) Upward compatible, also known as
`forward compatible, refers to Software that runs not only on the computer
`for which it was designed, but also on newer and more powerful models.
`Upward compatibility is important because it means that you can move to a
`newer, larger, and more sophisticated computer without converting your
`data. An example of upward/forward compatibility is the specification that a
`web browser ignore HTML tags not recognised. Ignoring data or application
`instructions not recognized is the typical behavior of forward compatible
`systems.
`
`Urban Cells (Wireless) Urban cells is the coverage provided by base
`stations located in urban areas. The radius of these cells is usually much
`smaller than suburban and rural cells due to the more difficult propagation
`environment.
`
`URI (Networking) See Uniform Resource Identifier.
`
`URL (Networking) See Uniform Resource Locator.
`
`URL Poisoning (Security) URL poisoning, also known as location
`poisoning, is a method of tracking Web user behavior by adding an
`identification (ID) number to the page address (Uniform Resource Locator)
`http://my.safaribooksonline.com/book/networking/network-management/9781602670006/network-dictionary/par02ch20?percentage=0&reader=html#X2ludGVyb… 10/14
`
`Rosetta-2025
`
`0005