Jeremy's IT Lab CCNA Wireless Fundamentals Day 55

802.11 (original) frequency/frequencies:

2.4 GHz

802.11 defines three types of service sets:

Independent

Infrastructure

Mesh

802.11 max data rate:

2 Mbps

802.11a frequency/frequencies:

5 GHz

802.11a max data rate:

54 Mbps

802.11ac frequency/frequencies:

5 GHz

802.11ac is aka Wi-Fi [...]

5

802.11ac max data rate:

6.93 Gbps

802.11ax frequency/frequencies:

2.4 / 5 / 6 GHz

802.11ax is aka Wi-Fi [...]

6

802.11ax max data rate:

4802.11ac (46.93 Gbps)

802.11b frequency/frequencies:

2.4 GHz

802.11b max data rate:

11 Mbps

802.11g frequency/frequencies:

2.4 GHz

802.11g max data rate:

54 Mbps

802.11n frequency/frequencies:

2.4 / 5 GHz

802.11n is aka Wi-Fi [...]

4

802.11n max data rate:

600 Mbps

[...] happens when a material causes a signal to scatter in all directions.

Scattering

[...] happens when a signal bounces off of a material, for example metal.

Reflection

[...] happens when a wave encounters an obstacle and travels around it.

Diffraction

[...] happens when a wave is bent when entering a medium where the signal travels at a different speed.

Refraction

[...] happens when a wireless signal passes through a material and is converted into heat, weakening the original signal.

Absorption

[...] is aka Wi-Fi 4.

802.11n

[...] is aka Wi-Fi 5.

802.11ac

[...] is aka Wi-Fi 6.

802.11ax

[...] is the maximum strength of the electric and magnetic fields of a wave.

Amplitude

[...] measures the number of up/down cycles per a given unit of time.

Frequency

A [...] operates as a wireless client of another AP, and can be used to connect wired devices to the wireless network.

workgroup bridge (WGB)

An AP in [...] mode can be used to extend the range of a BSS.

repeater

An AP operating as an [...] can be used to connect networks over long distances without a physical cable connecting them.

outdoor bridge

An IBSS is also called an [...] wireless network.

ad hoc

Does an SSID have to be unique?

No

In 802.11, the upstream wired network is called the [...].

DS (Distribution System)

In a BSS, can clients communicate directly with each other?

No, they must communicate via the AP

In an MBSS, what does MAP stand for?

Mesh Access Point

In an MBSS, what does RAP stand for?

Root Access Point

In an MBSS, which AP is connected to the wired network?

RAP (Root Access Point)

The [...] is a human-readable name which identifies the service set.

SSID

The [...] is the MAC address of the AP's radio.

BSSID

The [...] tests and certifies equipment for 802.11 standards compliance interoperability with other devices.

Wi-Fi Alliance

The area around an AP where its signal is usable is called a [...].

BSA (Basic Service Area)

The most common measurement of frequency is [...].

hertz

The term [...] refers to the amount of time for one cycle of a wave.

Period

The Wi-Fi [...] band consists of non-overlapping channels.

5 GHz

The Wi-Fi [...] band consists of overlapping channels.

2.4 GHz

The Wi-Fi [...] band typically provides further reach.

2.4 GHz

To avoid overlapping frequencies, it is recommended to use channels [...], [...], and [...] of the 2.4 GHz band.

1, 6, and 11

What does AP stand for?

Access Point

What does BSA stand for?

Basic Service Area

What does BSS stand for?

Basic Service Set

What does BSSID stand for?

Basic Service Set Identifier

What does CSMA/CA stand for?

Carrier Sense Multiple Access with Collision Avoidance

What does ESS stand for?

Extended Service Set

What does GHz stand for?

Gigahertz

What does Hz stand for?

Hertz

What does IBSS stand for?

Independent Basic Service Set

What does kHz stand for?

Kilohertz

What does MBSS stand for?

Mesh Basic Service Set

What does MHz stand for?

Megahertz

What does SSID stand for?

Service Set Identifier

What does THz stand for?

Terahertz

What does WGB stand for?

Workgroup bridge

When a client passes between APs in an ESS, it is called [...].

roaming

Which two main bands are used for wireless LAN communications?

2.4 GHz

5 GHz

Wireless devices that have associated with a BSS are called clients or [...].

stations

Wireless LANs are defined in IEEE [...].

802.11

Wireless networks operate in [...]-duplex.

half

Wireless networks use [...] to avoid collisions.

CSMA/CA