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Comptia Network+ > Unbounded Network Media > Flashcards

Unbounded Network Media Flashcards

1
Q

the time taken by a data packet sent through a wireless connection from a requesting device to the receiving device and back.

A

Latency

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2
Q

uses multiplexing to increase wireless network range and bandwidth. uses algorithms to send and receive data using multiple antennas, using multiple antenna pathways to send additional data. It can also recombine signals it receives to increase capacity and provide more reliable connections. 802.11n is an example.

A

Multiple input, multiple output (MIMO)

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3
Q

allows multiple independent radio antennas to access a system. multiple users can access the same channel. It uses spatial degrees of freedom to allow multiple user access to receive data from the access point to the wireless devices. 802.11ac is an example.

A

Multi-user MIMO (MU-MIMO

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4
Q

Up to eight devices can be connected to each other at a point in time. Common distance is 30ft, 100 meters max. uses the 2.4 GHz spectrum

A

Bluetooth

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5
Q

Receivers need an unobstructed view of the sender to successfully receive the signal, though the signal can reflect off hard surfaces to reach the recipient.

A

Infrared (IR)

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6
Q

Close proximity with each other, typically within 10 cm or less. Radio communications.

A

Near Field Communication (NFC)

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7
Q

is a family of specifications developed by the Institute of Electrical and Electronics Engineers (IEEE) for wireless LAN technology.

A

802.11 standard

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8
Q

802.11a speed/frequencyused/MIMO Streams Supported

A

54 Mbps/5GHz/1 MIMO Stream Supported

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9
Q

802.11b speed/frequencyused/MIMO Streams Supported

A

11 Mbps/2.4GHz/1 MIMO Stream Supported

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10
Q

802.11g speed/frequencyused/MIMO Streams Supported

A

54 Mbps/2.4GHz/1 MIMO Stream Supported

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11
Q

802.11n speed/frequencyused/MIMO Streams Supported

A

150 Mbps/2.4GHz or 5GHz/4 MIMO Streams Supported (600 Mbps using all 4 MIMO streams.

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12
Q

802.11ac speed/frequencyused/MIMO Streams Supported

A

433 Mbps/5GHz/8 MIMO Streams Supported. (866.7 Mbps per stream, 8 streams = 6,934 Mbps. 250 Meters coverage)

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13
Q

Which wireless channels have no overlap with each other

A

1, 6, 11

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14
Q

Provides additional data capacity. Combines neighboring channels into one larger channel. By doubling the channel width, the data capacity of the channel increases by slightly more than double.

A

Channel Bonding

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15
Q

What household appliance can greatly affect throughput on a 2.4 GHz wireless network.

A

Microwave Oven (microwave ovens operate on a 2.4GHz frequency band)

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16
Q

a device that provides a connection between wireless devices and can connect to wired networks.

A

Wireless Access Point (WAP)

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17
Q

a 32-bit alphanumeric string that identifies a WAP and all devices attached to it.

A

Service Set Identifier (SSID)

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18
Q

provides wireless LAN management for multiple access points.

A

Wireless Controllers

19
Q

a protocol that controls multiple WI-FI wireless access points. This can reduce the amount of time spent on configuring, monitoring, or troubleshooting a large network.

A

Lightweight Access Point Protocol (LWAPP)

20
Q

Signal strength on an antenna

21
Q

Wireless signals that travel where they are not intended

22
Q

concentrates the signal beam in a single direction. A relatively high gain. Must be precisely aligned. Only a narrow transmission area needs to be clear of interference. Used in a point-to-point network to connect one station to another.

A

Directional Antenna

23
Q

Examples of Directional Antennas

A

parabolic dish antenna, backfire antenna, yagi antenna, and panel antenna.

24
Q

radiates the signal beam out in all directions and has lower gain but a wider coverage area.

A

Omni-Directional Antenna

25
Q

Examples of Omni-Directional Antennas

A

ceiling dome or blister antenna, blade antenna, and carious rod-shaped antennas.

26
Q

created specifications to take advantage of the existing coax cables installed for cable television to extend the range of the data network in a home or office.

A

Multimedia over Coax Alliance (MoCA)

27
Q

Factors that affect performance of Infared

A

Sunlight, Obstacles, Smoke, Dust, Fog

28
Q

Factors that affect performance of Radio

A

Signal Characteristics of the antenna, Ambient Electrical Noise, Conductive Obstacles, Presence of other Electrical Equipment, Data Transmission Rate, Radio Frequency.

29
Q

A device that can use the IEEE 802.11 protocol. contains an adapter card, a PC card, or an embedded device to provide wireless connectivity.

A

Station (STA)

30
Q

A device or software that facilitates communication and provides enhanced security to wireless devices.

A

Access Point (AP)

31
Q

(1) Access Point

A

Basic Service Set (BSS)

32
Q

Multiple Access Points. A configuration of multiple BSS’s used to handle mobility on a wireless network.

A

Extended Service Set (ESS)

33
Q

No AP, also called Ad Hoc. A peer-to-peer network where each wireless station acts as both a client and a wireless AP.

A

Independent Basic Service Set (IBSS)

34
Q

A wired connection between a BSS and a premise-wide network.

A

Distribution System (DS)

35
Q

utilizes one or more WAPs to connect workstations to the cable backbone. uses either BSS or ESS. uses a star topology.

A

Infrastructure Mode

36
Q

also referred to as IBSS, utilizes a peer-to-peer configuration in which each wireless device talks directly to other devices. uses a mesh topology.

A

Ad-hoc Mode

37
Q

Things to consider when using a wireless range extender

A

Match router specifications. Configure range extender with same SSID if possible.

38
Q

are a continuous announcement by a wireless access point that transmits its name, or SSID, so that it is discoverable by wireless devices searching for a network connection. Sometimes referred to as a beacon.

A

SSID Broadcasts

39
Q

protocol designed for controlling and monitoring of home or light commercial devices. Examples include smart thermostats, lighting, locks, sensors, and hubs.

40
Q

a wireless sensor network technology operating in the 2.4 GHz band. Examples include health and fitness monitors, BMI sensors in weight scales, and temperature sensors.

41
Q

IoT Examples include smart phones, music players, tracking devices, locks, and lights.

42
Q

Short Range. Examples include tap devices to share data.

A

Near Field Communication (NFC)

43
Q

Detect and measure heat, chemical gases, medical analysis through breathalyzers, and remote control of appliances.

A

Infrared (IR)

44
Q

Examples include ID/entry access cards and tracking tags.

A

Radio Frequency Identification (RFID)

Comptia Network+ (9 decks)

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