Networking Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing networking and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • C

    CDSL (Consumer Digital Subscriber Line)

    Also see our Fast guide to DSL. CDSL (Consumer Digital Subscriber Line) is a version of Digital Subscriber Line (DSL) service, trademarked by Rockwell Corp.

  • central office (CO)

    In telephone communication in the United States, a central office (CO) is an office in a locality to which subscriber home and business lines are connected on what is called a local loop.

  • Certified Wireless Networking Professional (CWNP)

    Certified Wireless Networking Professional (CWNP)is the name for the family of wireless certifications from Planet3Wireless.

  • channel-associated signaling (CAS)

    Channel-associated signaling (CAS) is signaling (for example, in a T-carrier system line) in which control signals, such as those for synchronizing and bounding frames, are carried in the same channels as voice and data signals... (Continued)

  • chiral fiber

    Chiral fiber is a specialized optical fiber medium with its core twisted into a helical shape.

  • CIDR (Classless Inter-Domain Routing or supernetting)

    CIDR (Classless Inter-Domain Routing) is a way to allocate Internet addresses more flexibly than the original system of Internet Protocol (IP) address classes allowed.

  • circuit-switched

    Circuit-switched is a type of network in which a physical path is obtained for and dedicated to a single connection between two end-points in the network for the duration of the connection.

  • circular mil

    The circular mil is a unit of area used especially when denoting the cross-sectional size of a wire or cable.

  • Cisco Certified Internetwork Expert (CCIE certification)

    Cisco Certified Internetwork Expert (CCIE certification) is a series of technical certifications for senior networking professionals who design, build, implement, maintain and troubleshoot complex enterprise networking infrastructures.

  • Cisco Certified Network Professional (CCNP)

    Cisco Certified Network Professional (CCNP) is an intermediate-level certification in the Cisco certified professional program.

  • Cisco Information Security Specialist (CISS)

    Cisco Information Security Specialist (CISS) is an entry-level certification attesting that the holder has demonstrated the foundational knowledge and skills required to install and support a Cisco Self-Defending Network... (Continued)

  • Cisco Integrated Service Routers Generation 2 (ISR G2)

    ISR G2 is a second generation Integrated Services Router (ISR) from Cisco Systems, Inc.

  • Cisco IOS (Cisco Internetwork Operating System)

    Cisco IOS (Internetwork Operating System) is a proprietary operating system that runs on most Cisco Systems routers and switches.

  • Cisco LISP (Location Identifier Separation Protocol)

    LISP (Location Identifier Separation Protocol) is a routing and addressing architecture developed by Cisco Systems. LISP creates two addresses for each network node: one for its identity and another for its location in the network.

  • client/server (client/server model, client/server architecture)

    Definition: Learn what the client/server model is, how it works and why you are using it right now to view this Web page.

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