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D413 - Telecomm and Wireless Communications
1. Network: Interconnected collection of computers and communication devices
2. Node: Individual computer or device connected to a network
3. Host: Computer or device connected to a network that provides services
4. Advantages of Networking: Sharing equipment and data
5. Disadvantages of Networking: Personnel and cost increase, vulnerabilities to cyberattacks
6. Local Area Network (LAN): A network that is usually confined to a single building and managed by a single entity. Example:
Oflce Building
7. Metropolitan Area Network (MAN): Consists of two or more LANs connected with private or public communication lined within
the same geographic area—for example, a computer network used by governmental employees of an entire city.
8. Wide Area Network (WAN): Consists of a large number of networks and PCs connected with private and public communication
lines throughout many geographic areas; for example, computers used by the US government.
9. Personal Area Network (PAN): A small network, perhaps consisting of a single computer and mobile device.
10. Campus Area Network (CAN): A network spread across multiple buildings in the same geographical location, much
like a college campus.
11. Global Area Network (GAN): Any network that spans multiple countries, for example, the Internet.
12. Star Topology: A topology that involves running cables from each node to connect a single point. The center is usually a
device known as a hub.
13. Ring Topology: Common network topology with devices connected in a circular loop
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14. Bus Topology: Network topology that uses a single cable or conductor to connect all nodes on the network.
15. Mesh Topology: A network topology where each node is connected to each of the other nodes. The number of cable paths
rapidly increases as more nodes are added.
16. Centralized Administration: Methodology used to administer a client/server network
17. Decentralized Administration: Methodology used to administer a peer-to-peer network
18. Cloud Computing: Otters services including SaaS, PaaS, and IaaS
19. Private Cloud: Type of cloud that is not accessible to the general public
20. Public Cloud: Type of cloud that is accessible to the general public
21. Hybrid Cloud: Type of cloud that combines private and public cloud services
22. Network Operating System (NOS): Provides a communication system between nodes. Examples include Windows
Server 2008/2012/2016, Unix, and Linux.
23. Data Segments: Divided parts of data to be transmitted on a network
24. Protocol: Set of rules that controls communication between two nodes
25. MAC Address: Physical address used to identify a node on a network
26. IP Address: Logical address used to identify a node on a network
27. Media Converter: Converts one type of electrical signal into another
28. Repeater: Regenerates digital signals, allowing the network media to exceed its recommended length.
29. Hub: Provides a central connection point for a network
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47. Full Duplex: Communication that happens in two directions at the same time.
48. Near-End Crosstalk: A measurement of crosstalk at the near end, or send-ing end, of a cable.
49. Far-End Crosstalk (FEXT): A measurement of reflective loss at the far end, or output end, of a cable.
50. Alien Crosstalk (AXT): Crosstalk generated from network cables in close proximity to each other
51. Decibal: An electrical measurement that is used to express the amount of power or energy gained or lost.
52. Power over Ethernet (PoE): A way of powering devices that consume small amounts of electrical energy, approximately
13 watts at 48 volts, over net-work cable.
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53. fiber-optic cable: Cable that uses light guided through thin glass/plastic tubes, instead of electrical signals, to transmit
data.
54. Wavelength: The total distance the electromagnetic wave or light wave travels during one full cycle.
55. Single-mode fiber-optic cable: Has a smaller core diameter than multimode fiber-optic cable and carries light farther
and with less attenuation.
56. Modulation: The mixing of two radio signals, typically a carrier wave with a data signal.
57. Infrared: Used in line-of-sight transmissions and is not susceptible to radio interference.
58. Orthogonal Frequency Division Multiplexing (OFDM): Transmission technique used with wireless
devices that use the 5-GHz radio band and can achieve a data rate as high as 54 Mbps. It divides the allotted frequency into channels similar to frequency hopping and direct sequencing. Digital.
59. Dense Wavelength Division Multiplexing (DWDM): An optical multiplexing technology that allows several
ditterent streams of data to travel down the same optical fiber simultaneously.
60. Frequency Division Multiplexing (FDM): Divides the available bandwidth into frequency bands, and each band is
used for a ditterent communication channel. Analog or Digital.
61. Synchronous Time Division Multiplexing: Which multiplexing technique transmits each signal from one input
source via a single time slot through the creation of ditterent slots?
62. Asynchronous Time-Division Multiplexing: Which category of multiplexing randomly allo-cates time slots to
ditterent data signals depending on the rate at which they are being generated from the source?
63. Needs: Which assessment is the first part of the design process?
64. Isolation: Which electrical system is required for network equipment according to industry standards?
65. Frequency Division Multiplexing (FDM): A company is developing a television network to broadcast local
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79. A cable transmitting signals between 15 and 20 MHz: Which cable realizes noise protection with the
use of foil shielding?
80. 802.3: IEEE standard that describes the characteristics of various Ethernet technologies, such as 10 Mbps, Fast Ethernet, Gigabit
Ethernet, and 10 Giga-bit Ethernet.
81. Analog signal: A signal that has a continuous range of values, much like a wave.
82. Digital Signal: Signal that has discrete values of on or ott.
83. Crosstalk: Interference that comes from neighboring conductors inside a wire's insulating jacket
84. Resistance: The opposition to direct current (DC)
85. Cat 5/5e Maximum Frequency Rating: 100 MHz
86. Cat 6 Maximum Frequency Rating: 250 MHz
87. Cat 6a Maximum Frequency Rating: 500 MHz
88. Cat 7 Maximum Frequency Rating: 600 MHz
89. Cat 5/5e Data Rate: 100 Mbps/1000 Mbps (using 4 pairs)
90. Cat 6 - Data Rate: 1 GBps
91. Cat 6a - Data Rate: 10 Gbps
92. Cat 7 - Data Rate: 10 Gbps
93. Cat 8 - Data Rate: 40 Gbps
94. Auto-MDIX compliant device: Automatically reassigns the pin functions so that a crossover cable is not required for
communication.
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95. demodulation: The receiver separates the voice wave from the carrier wave.
96. Wireless Access Point (WAP): Provides a connection between a wireless network and a cable-based network.
97. 802.1x: A standard for authentication methods for wireless networking.
98. Service Set Identifier (SSID): The user-supplied network name of a WLAN; it can generally be alphanumeric
from 2 to 32 characters.
99. Parity check: A method of verifying the integrity of transmitted data.
100. Broadcast storm: When the number of collisions reaches a point that the network is flooded with a continuous number of
collisions and rebroadcasts.
101. Collision Domain: a section of a network where collisions occur
102. Segmenting: The act of dividing a network into smaller sections to avoid collisions
103. Interior Gateway Protocol (IGP): The routing protocol the administrator uses to connect networks within an
autonomous system.
104. Exterior Gateway Protocol (EGP): A routing protocol that was designed to exchange routing information between
ditterent autonomous systems.
105. Peak Amplitude: What is the absolute value of a signal's greatest magnitude in proportion to the energy that it is able to
carry?
106. Wavelength Division Multiplexing (WDM): Multiple communications channels are consoli-dated and then
transmitted on lightwaves with ditterent wavelengths. More common in telecommunication systems and computer networks that use laser systems to send light signals over fiber optic cables.
107. Code-division multiplexing (CDM): Assigns a unique code to each channel, and all channels share the same
frequency band simultaneously. Digital.
