Flashcards
COSC 118 - Chapter 3
Flashcards do conjunto (37)
- 1A technology defined by the IEEE 802.3ab standard, supports 1000 Mbps Ethernet (usually called Gigabit Ethernet) over Category 5 or higher UTP cable, using baseband signaling.1000BaseT Ethernet
(Gigabit Ethernet) - 2100 Mbps Ethernet using baseband signaling over two strands of fiber-optic cabling.100BaseFX
- 3A technology defined by IEEE 802.3u, it’s the most commonly used Ethernet variety today. It runs over Category 5 or higher UTP cable and uses two of the four wire pairs: one to transmit data and the other to receive data. It runs at 100 Mbps, using baseband signaling.100BaseTX
- 4A technology defined by IEEE 802.3i, it’s Ethernet running at 10 Mbps, using baseband signaling over Category 3 or higher twisted-pair cabling. Although still seen in older networks, newer networks use 100BaseT or faster technology.10BaseT
- 5A technology defined by IEEE 802.3an, it’s 10 Gigabit Ethernet running over four pairs of Category 6A UTP cabling, using baseband signaling. Unlike the other BaseT Ethernet standards, 10GBaseT operates only in full-duplex mode.10GBaseT
- 6Sometimes called peer-to-peer mode, it’s a wireless mode of operation typically used only in small or temporary installations. There’s no central device, and data travels from one device to another to reach the destination device.ad hoc mode
- 7A DSL variation in which the download and upload speeds differ substantially, so the data rates aren’t symmetrical. Typical connection speeds for downloading data range from 256 Kbps to 8 Mbps; upload speeds are typically much slower, in the range of 16 Kbps to 640 Kbps.Asymmetric DSL (ADSL)
- 8A type of signaling used in networks, in which each bit of data is represented by a pulse of electricity (on copper media) or light (on fiber-optic media). These signals are sent at a single fixed frequency, using the medium’s entire bandwidth. LAN technologies use baseband signaling.baseband
- 9A type of signaling that uses analog techniques to encode binary 1s and 0s across a continuous range of values. Broadband signals move across the medium in the form of continuous electromagnetic or optical waves rather than discrete pulses. Signals flow at a particular frequency, and each frequency represents a channel of data, allowing multiple streams of data on a single wire. TV and cable Internet use broadband signaling.broadband
- 10An access control method used by Wi-Fi networks, in which an acknowledgement is required for every packet sent, thereby avoiding most possibilities of a collision (collision avoidance).Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
- 11A media access method in which a device must first listen (carrier sense) to the medium to be sure no other device is transmitting. If two devices transmit at the same time (multiple access), a collision occurs and is detected (collision detection). In this case, all devices involved in the collision wait for a random period of time before transmitting again.Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
- 12The extent to which signals in an Ethernet bus topology network are propagated. All devices connected to a logical bus topology network are in the same collision domain.collision domain
- 13The result of two or more devices on the same medium transmitting simultaneously when CSMA/CD is the media access method in use. See also Carrier Sense Multiple Access with Collision Detection (CSMA/CD).collision
- 14The error-checking code in an Ethernet frame’s trailer; it’s the result of a mathematical algorithm computed on the frame data. When the destination device receives the frame, the calculation is repeated. If the results of this calculation don’t match the CRC in the frame, it indicates the data was altered in some way.Cyclic Redundancy Check (CRC)
- 15The official standard governing cable modem operation.Data Over Cable Service Interface Specification (DOCSIS)
- 16A broadband technology that uses existing phone lines to carry voice and data simultaneously.Digital Subscriber Line (DSL)
- 17An extension of the physical star topology, in which a central switch or hub is the central connecting point for other switches or hubs .that have computers and other network devices attached, forming a star of stars.extended star topology
- 18A technology that uses the token-passing media access method and dual rings for redundancy. The rings in an FDDI network are usually a physical ring of fiber-optic cable. FDDI transmits at 100 Mbps and can include up to 500 nodes over a distanc.e of 100 kmsFiber Distributed Data Interface (FDDI)
- 19The frame formats that describe the content and length of a frame header.frame types
- 20An operational mode for Wi-Fi networks, in which wireless stations connect through a wireless access point before they can begin communicating with other devices.infrastructure mode
- 21The path data travels between computers on a network. The most common logical topologies are switched, bus, and ring.logical topology
- 22A set of rules governing how and when the network medium can be accessed for transmission. The rules ensure that data is transmitted and received in an orderly fashion,media access method
(media access control) - 23A topology in which each device in the network is connected to every other device, providing multiple pathways in the event of a device or cable failure.mesh topology
- 24The cabling used to communicate between LANs or between hubs or switches. The backbone cabling often runs at a faster speed than the cabling used to connect computers because the backbone must carry data from many computers to other parts of the network.network backbone
- 25A network topology in which a continuous length of cable connects one computer to another in daisy-chain fashion. There’s no central interconnecting device.physical bus topology
- 26A cabling arrangement in which each devices is connected to another device in daisy-chain fashion, and the last device connects back to the first device forming a ring. Used by token ring and FDDI, the physical ring is rarely used now.physical ring topology
- 27A network topology that uses a central device, such as a hub or switch, to interconnect computers in a LAN. Each computer has a single length of cable going from its NIC to the central device. It’s the most common physical topology in LANs.physical star topology
- 28The arrangement of cabling and how cables connect one device to another in a network. The most common physical topology is a star, but bus, ring, point-to-point, and mesh topologies are also used.physical topology
- 29A topology in which cabling creates a direct link between two devices; used most often in WANs or in wireless networks to create a wireless bridge.point-to-point topology
- 30The result of electricity bouncing off the end of a cable and back in the other direction. It causes corruption of data as the bouncing signal collides with signals behind it. A terminator at each cable end is needed to prevent signal bounce.signal bounce
(reflection) - 31Signals traveling across a medium and through any connectors and connecting devices until the signal weakens enough to be undetectable or is absorbed by a termination device.signal propagation
- 32A DSL variation in which the download and upload speeds are equivalent, or symmetrical.Symmetric DSL (SDSL)
- 33An electrical component called a resistor, placed at the ends of a physical bus network to absorbs the signal instead of allowing it to bounce back up the wire.terminator
- 34A technology based on the IEEE 802.5 standard; its cabling is in a physical star topology, but it functions as a logical ring. It uses the token-passing media access method, and only the computer holding the token can send data.token ring
- 35An operational mode of wireless networking usually used to connect two wired LANs that are separated from each other in such a way that using physical media is impractical. Can also be used to extend the reach of a wireless network.wireless bridge
- 36The name given to the 802.11 series of IEEE standards that define four common varieties of wireless LANs: 802.11a, 802.11b, 802.11g, and 802.11n.Wireless Fidelity (Wi-Fi)
- 37A wireless broadband technology defined in 802.16-2004 or 802.16e for mobile. It is considered a fourth-generation (4G) technology for bringing wireless Internet access to remote areas, large areas up to a mile radius, and mobile users.Worldwide Interoperability for Microwave Access (WiMAX)
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- Bachelors Degree COSC 118 FlashCards sobre COSC 118 - Chapter 3, criado por j.salvino em 30-09-2015.
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