British Dictionary definitions for control control verb -trols, -trolling or -trolled tr to command, direct, or ruleto control a country to check, limit, curb, or regulate; restrainto control one's emotions; to control a fire to regulate or operate a machine to verify a scientific experiment by conducting a parallel experiment in which the variable being investigated is held constant or is compared with a standard to regulate financial affairs to examine and verify financial accounts to restrict or regulate the authorized supply of certain substances, such as drugs Show More power to direct or determineunder control; out of control a means of regulation or restraint; curb; checka frontier control often plural a device or mechanism for operating a car, aircraft, etc a standard of comparison used in a statistical analysis or scientific experiment a device that regulates the operation of a machine. From a medieval method of checking accounts by a duplicate register. Sense of "dominate, direct" is midc.
Chapter Review Questions Chapter Description To determine what transmission media is right for particular networking enviornment you must consider organization's required throughput, cabling distance, noise resistance, security, flexibility and plans for growth.
In this article Steve McQuerry highlights the concepts and procedures for assembling and cabling Cisco routers. Describe the primary types of network cabling, including shielded and unshielded twisted-pair, coaxial, fiber optics multimode and single-modeand wireless communications Describe types and characteristics of cabling and connectors used in an Ethernet LAN Describe the necessary components for enabling WAN connectivity over serial or ISDN BRI, local loop using DSL, and a cable connection for a Cisco router This chapter examines several Chapter 2 guided questions of network media, including twisted-pair cable, coaxial cable, fiber-optic cable, and wireless.
It highlights the concepts and procedures for assembling and cabling Cisco routers. Finally, it presents factors that you should consider when selecting network devices. Cabling and Infrastructure Media is the actual physical environment through which data travels as it moves from one component to another, and it connects network devices.
The most common types of net-work media are twisted-pair cable, coaxial cable, fiber-optic cable, and wireless.
Each media type has specific capabilities and serves specific purposes. Understanding the types of connections that can be used within a network provides a better understanding of how networks function in transmitting data from one point to another.
Twisted-Pair Cable Twisted-pair is a copper wire-based cable that can be either shielded or unshielded. Twisted- pair is the most common media for network connectivity.
Unshielded twisted-pair UTP cable, as shown in Figureis a four-pair wire. Each of the eight individual copper wires in UTP cable is covered by an insulating material.
In addition, the wires in each pair are twisted around each other. The advantage of UTP cable is its ability to cancel interference, because the twisted-wire pairs limit signal degradation from electromagnetic interference EMI and radio frequency interference RFI. To further reduce crosstalk between the pairs in UTP cable, the number of twists in the wire pairs varies.
UTP, as well as shielded twisted-pair STP cable, must follow precise specifications as to how many twists or braids are permitted per meter. When used as a networking medium, UTP cable has four pairs of either or gauge copper wire.
UTP used as a networking medium has an impedance of ohms, differentiating it from other types of twisted-pair wiring such as that used for telephone wiring.
Because UTP cable has an external diameter of approximately 0. Also, because UTP can be used with most of the major networking architectures, it continues to grow in popularity. Several categories of UTP cable exist: Each pair of wires is wrapped in a metallic foil. The four pairs of wires are then wrapped in an overall metallic braid or foil, usually ohm cable.
Token Ring network topology uses STP. Speed of either media type is usually satisfactory for local-area distances. Both are the least-expensive media for data communication.
Because most buildings are already wired with UTP, many transmission standards are adapted to use it to avoid costly rewiring with an alternative cable type. Twisted-pair cabling is the most common networking cabling in use today; however, some networks still use older technologies like coaxial cable, as discussed in the next section.
Coaxial Cable Coaxial cable consists of a hollow outer cylindrical conductor that surrounds a single inner wire conducting element. This section describes the characteristics and uses of coaxial cable. As shown in Figurethe single inner wire located in the center of a coaxial cable is a copper conductor, surrounded by a layer of flexible insulation.
Over this insulating material is a woven copper braid or metallic foil that acts both as the second wire in the circuit and as a shield for the inner conductor.
This second layer, or shield, can help reduce the amount of outside interference. An outer jacket covers this shield. Coaxial cable can be laid over longer distances than twisted-pair cable. For example, Ethernet can run approximately meters using twisted-pair cable, but meters using coaxial cable.1 And I, brethren, when I came to you, came not with excellency of speech or of wisdom, declaring unto you the testimony of God.
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In , Exploratorium researcher Joyce Ma published a brief formative study on Daisy, an artificially intelligent computer program that engages visitors in text-based vetconnexx.com is a “chatbot” with some pre-programmed questions in her repertoire, and Ma was studying the.
Ch 20 The New Frontier and the Great Society. Kennedy and the Cold War - pg. The New Frontier - pg.
The Great Society - pg.
New Story ~ Give a summary statement of the new book or chapter. Discuss illustrations, captions, headings Students make predictions. Teacher introduces the new vocabulary. All students then read at their own pace to a designated page. Guided Instruction.
by Douglas Fisher and Nancy Frey. Table of Contents. Chapter 2. Questioning to Check for Understanding. Most of us were introduced to the concept of open-ended and closed questions when we were in teacher preparation programs.