Jeremy's IT Lab CCNA Wireless Architectures Day 56

802.11 Frame 'Address 1/2/3/4' field length:

6 bytes (per address)

802.11 Frame 'Duration/ID' field length:

2 bytes

802.11 Frame 'FCS' field length:

4 bytes

802.11 Frame 'Frame Control' field length:

2 bytes

802.11 Frame 'HT Control' field length:

4 bytes

802.11 Frame 'QoS Control' field length:

2 bytes

802.11 Frame 'Sequence Control' field length:

2 bytes

[...] AP architecture is between autonomous AP and split-MAC architecture in terms of functionality.

Cloud-based

[...] APs are self-contained systems that don't rely on a WLC.

Autonomous

A [...] WLC is a hardware appliance in a central location of the network.

Unified

A [...] WLC is a VM running on a server, usually in a private cloud in a data center.

Cloud-based

A [...] WLC is integrated within an AP.

Mobility Express

A Cloud-based WLC can support about [...] APs.

3000

A Mobility Express WLC can support about [...] APs.

100

A Unified WLC can support about [...] APs.

6000

An [...] WLC is integrated within a switch.

Embedded

An Embedded WLC can support about [...] APs.

200

Autonomous APs connect to a switch via [access/trunk] ports.

trunk

CAPWAP [...] tunnels use UDP port 5246.

Control

CAPWAP [...] tunnels use UDP port 5247.

Data

CAPWAP Control tunnels use [...] port 5246.

UDP

CAPWAP Control tunnels use UDP port [...].

5246

CAPWAP Data tunnels use [...] port 5247.

UDP

CAPWAP Data tunnels use UDP port [...].

5247

Cisco [...] is a popular cloud-based AP solution.

Meraki

How many CAPWAP tunnels does a lightweight AP form with the WLC?

2 (control and data)

Lightweight APs connect to a switch via [access/trunk] ports.

access

The CAPWAP [...] tunnel is encrypted by default.

control

The CAPWAP [...] tunnel isn't encrypted by default.

data

The CAPWAP control tunnel [is/isn't] encrypted by default.

is

The CAPWAP data tunnel [is/isn't] encrypted by default.

isn't

The use of lightweight APs and WLCs is also known as [...] architecture.

split-MAC

There are three 802.11 connection states:

1: [...]

2: [...]

3: [...]

1: Not Authenticated, not Associated.

2: Authenticated, not Associated.

3: Authenticated and Associated.

What 802.11 message type?

ACK

Control

What 802.11 message type?

Association request

Management

What 802.11 message type?

Association response

Management

What 802.11 message type?

Authentication

Management

What 802.11 message type?

Beacon

Management

What 802.11 message type?

CTS

Control

What 802.11 message type?

Probe request

Management

What 802.11 message type?

Probe response

Management

What 802.11 message type?

RTS

Control

What are the three 802.11 message types?

Management

Control

Data

What are the three main wireless AP deployment methods? (three architectures)

Autonomous

Lightweight

Cloud-based

What does CAPWAP stand for?

Control and Provisioning of Wireless Access Points

What does LWAPP stand for?

Lightweight Access Point Protocol

What does WLC stand for?

Wireless LAN Controller

What is the default operating mode of a lightweight AP, in which it offers a BSS for clients?

Local

Which feature allows a lightweight AP to locally switch traffic if the tunnels to the WLC go down?

FlexConnect

Which lightweight AP operating mode adds FlexConnect functionality to the Bridge/Mesh mode?

Flex plus Bridge

Which lightweight AP operating mode can form a dedicated bridge between sites?

Bridge/Mesh

(a mesh can be formed between the APs)

Which lightweight AP operating mode is dedicated to capturing 802.11 frames and sending them to a device running software such as Wireshark?

Sniffer

Which lightweight AP operating mode is dedicated to listening to traffic on the wired network to detect rogue devices? (it does not use its radio)

Rogue Detector

Which lightweight AP operating mode is dedicated to receiving 802.11 frames to detect rogue devices?

Monitor

Which lightweight AP operating mode is dedicated to RF spectrum analysis on all channels?

SE-Connect

Which messages does a wireless station listen for when doing 802.11 passive scanning?

Beacon

Which two messages are used for 802.11 active scanning?

Probe request

Probe response