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CCNA > Chapter 26: Fundamentals of Wireless Nentworks > Flashcards

Chapter 26: Fundamentals of Wireless Nentworks Flashcards

1
Q

Wired Ethernet and Wi-Fi are based on which two IEEE standards, respectively?

A

802.3, 802.11

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2
Q

Devices using a wireless LAN must operate in which mode?

A

Half Duplex

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3
Q

An access point is set up to offer wireless coverage in office. What is the correct 802.11 term for the resulting standalone network?

A

BSS (basic service set)

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4
Q

What is used to uniquely identify an AP and the basic service set to maintains with its associated wireless clients?

A

SSID (Service set identifier)

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5
Q

What can be used to provide wireless connectivity to nonwireless device?

A

Workgroup bridge

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6
Q

What is not needed in a Cisco outdoor mesh network?

A

Ethernet cabling to each AP

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7
Q

What is the frequency band commonly used for Wi-Fi?

A

2.5 GHz, 5 GHz

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8
Q

Which of the following are considered to be nonoverlaping channels?

a. 1,2 and 3 in the 2.4-GHz band
b. 1,5 and 10 in the 2.4-GHz band
c. 1,6 and 11 in the 2.4 GHz band
d. 40,44 and 48 in the 5-GHz band

A

c. 1,6 and 11 in the 2.4 GHz band

d. 40,44 and 48 in the 5-GHz band

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9
Q

What does the area where the AP’s signal is usable called?

A

BSA (Basic service area) or cell

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10
Q

What is BSSID and what is it for?

A

BSSID (basic service set identifier) is generated by the AP based on it’s MAC Address and is used to advertise the existence of the BSS to the devices in range.

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11
Q

How can an AP advertise more than one VLAN to it’s clients?

A

By advertising more than one SSID and mapping every SSID to one VLAN.

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12
Q

What do we call an interconnected APs by switched infrastructure?

A

ESS (Extended service set)

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13
Q

What do we call the process of a wireless client moving between APs?

A

Roaming

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14
Q

What is IBSS?

A

IBSS (independent v
basic service set) is an ad hoc (or on demand) wireless network that is created between two devices without the need for an AP.

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15
Q

What does a wireless repeater do?

A

A wireless repeater takes the signal it receives and repeats or retransmits it in a new cell area around the repeater.

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16
Q

What is a Workgroup bridge?

A

WGB is a wireless device that is used to offer wireless connection to devices in network that do not have the possibility to directly connect to a wireless network.

17
Q

What is an Outdoor Bridge?

A

Two APs that are wirelessly connected to provide connection between buildings or cities.

18
Q

In which mode should the AP operate in order to support the use of Outdoor Bridge?

A

Bridge mode

19
Q

What is a wireless mesh network?

A

Multiple APs configured in mesh mode where wireless traffic is bridged from AP to AP, in a daisy-chain fashion, using another wireless channel.

20
Q

What is the wireless wave frequency?

A

The number of times the signal makes one complete up and down cycle in 1 second.

21
Q

What is a Hertz?

A

It is the most commonly used frequency unit and is nothing other than one cycle per second.

22
Q

How many Hz in:

a. Kilohertz
b. Megahertz
c. Gigahertz

A

a. kHz: 1000 Hz
b. MHz: 1000,000 Hz
c. GHz: 1000,000,000 Hz

23
Q

What is the frequency of Radio (RF)

A

It is the frequency range between 3 kHz to 300 GHz.

24
Q

What are the basic Characteristics of 802.11-1997

A

2.4 GHz: Yes
5 GHz: No
Max Data Rate: 2 Mbps
Note: The original 802.11 standard ratified in 1997

25
Q

What are the basic Characteristics of 802.11b

A

2.4 GHz: Yes
5 GHz: No
Max Data Rate: 11 Mbps
Note: Introduced in 1999

26
Q

What are the basic Characteristics of 802.11g

A

2.4 GHz: Yes
5 GHz: No
Max Data Rate: 54 Mbps
Note: Introduced in 2003

27
Q

What are the basic Characteristics of 802.11a

A

2.4 GHz: No
5 GHz: Yes
Max Data Rate: 54 Mbps
Note: Introduced in 1999

28
Q

What are the basic Characteristics of 802.11n

A

2.4 GHz: Yes
5 GHz: Yes
Max Data Rate: 600 Mbps
Note: HT (High throughput), Introduced in 2009

29
Q

What are the basic Characteristics of 802.11ac

A

2.4 GHz: No
5 GHz: Yes
Max Data Rate: 6.93 GHz
Note: VHT (Very High throughput), Introduced in 2013

30
Q

What are the basic Characteristics of 802.11ax

A

2.4 GHz: Yes
5 GHz: Yes
Max Data Rate: 4x6.93 GHz or 4x802.11ac
Note: High Efficiency Wireless, Wi-Fi6; expected late 2019; will operate in other bands too, as they become available.

CCNA (5 decks)

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