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Advanced Wireless > Architecture of WLAN > Flashcards

Architecture of WLAN Flashcards

1
Q

Radio Card Formats?

A 
PCMCIA
CF
SD
PCI
Mini-PCI
PCI Express
USB
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2
Q

Radio Card Chip Sets?

A

Integrated Circuits
May support Functions, Frequencies, Protocols
Often Proprietary

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3
Q

Progression of WLAN Architecture?

A 
Autonomous AP
WNMS
Centralized WLAN Architecture
Lightweight AP
WLAN Controller
Split MAC
Remote Office WLAN Controller
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4
Q

Management Plane?

A

Defined by administrative network management, administration, and monitoring

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5
Q

Control Plane?

A

Consists of control or signaling information and is often defined as network intelligence or protocols

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6
Q

Data Plane?

A

Also known as the user plane, is the location in a network where user traffic is actually forwarded.

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7
Q

802.11 Management Plane?

A

WLAN Configuration
WLAN Monitoring and Reporting
WLAN Firmware Management

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8
Q

802.11 Control Plane?

A

Dynamic RF
Roaming Mechanisms
Client Load Balancing
Mesh Protocols

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9
Q

802.11 Data Plane?

A

Where user data is forwarded
Devices that usually participate in the data plane are the AP and a WLAN controller
Each vendor has a unique method and recommendations for handling data forwarding

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10
Q

Management Plane Functions

A

WLAN Configuration

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11
Q

Examples of WLAN Configuration?

A 
SSIDs
Security
WMM
Channel
Power Settings
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12
Q

WLAN Monitoring and Reporting?

A

Monitoring of layer 2 statistics like: ACKs, Client Associations, Resassociations, Data Rates.

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13
Q

Examples of Upper layer monitoring and reporting includes:

A

Ip connectivity
TCP Throughput
Latency statistics, and
Stateful Firewall Sessions

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14
Q

WLAN Firmware Management?

A

The ability to upgrade access points and other WLAN devices with the latest vendor operational code

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15
Q

Control Plane Functions?

A

Dynamic RF
Roaming Mechanisms
Client Load Balancing
Mesh Protocols

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16
Q

Dynamic RF?

A

Coordinated channel and power settings for multiple access points.
Radio Resource Management

17
Q

Roaming Mechanisms?

A

Support for roaming handoffs between access points
Capabilities may include
- L3 Roaming
- Maintaining stateful firewall sessions of clients
- Forwarding of buffering packets

18
Q

Client Load Balancing?

A

Collecting and sharing client load and performance metrics between access points to improve overall WLAN operations

19
Q

Mesh Protocols?

A

Routing user data between multiple access points requires some sort of mesh routing protocol.
The 802.11s amendment has defined standardized mesh routing merchanism but most WLAN vendors are currently using proprietary methods and metrics

20
Q

Data Plane Function?

A

The data plane is where user data is forwarded
The two devices that usually participate in the data plane are the AP and a WLAN controller.
Autonomous APs handle all data forwarding operations locally.
In a WLAN controller solution, data is normally forwarded from the centralized controller, but data can also be forwarded at the edge of the network.

21
Q

Three primary WLAN architectures?

A

Autonomous WLAN Architecture
Centralized WLAN Architecture
Distribtuted WLAN Architecture

22
Q

Autonomous AP?

A 
Once called fat AP
May Provide Additional Services
No Controller required
Multiple Management Interfaces
Multiple Mode Support
Found in SOHO and Enterprise Networks
23
Q

Features of Autonomous AP

A 
Multiple management interfaces
WEP, WPA, WPA2
WMM QoS capabilities
Fixed or detachable antennas
Filtering options, such as MAC and protocol
Removable radio cards
24
Q

Advanced Features of Autonomous AP

A

Built-in RADIUS and user databases
VPN Client and/or server support
DHCP Server
Captive Web Portals

25
Q

WNMS?

A

Wireless Network Management System?

26
Q

Wireless Network Management System?

A

Provides a central point of management to configure and maintain thousands of autonomous access points
Hardware appliance or a software solution

27
Q

Centralize Wlan Architecture?

A 
Uses a central WLAN controller
Uses lightweight (Thin) APs
May use adaptive APs
All intelligenceq resides in controller
Encryption may be controller or AP based
28
Q

Lightweight AP

A

Also called thin AP

Also called controller based AP

29
Q

WLAN Controller Planes?

A

Management Plane
Control Plane
Data Plane

30
Q

WLAN Controller Functions?

A 
AP Management
802.11 Traffic Tunneling
AP Group Profiles
WLAN Profiles
Virtual BSSIDs
VLAN
User Management
Layer 2 Security Support

Advanced Wireless (11 decks)

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