Wireless Flashcards
Cisco OEAP
Cisco OfficeExpress AP
In a Cisco OEAP setup - is roaming supported?
No
The FlexConnect access points can switch client data traffic ….
locally and perform client authentication locally when their connection to the controller is lost
FlexConnect - Central Switching
Data traffic sent back to controller
FlexConnect - Local Switching
Data traffic sent to local port
Mobility Group definition
- Set of controlers
- Identified by the same mobility group name
- Realm of seamless roaming
How does a Mobility Group enable smoother roaming?
Share context and state of client devices
Mobilility Group - Mobile Announce
When a client joins associates with a WLC a WLC sounds out a broadcast out to all members of the Mobility Group to inform them of the client
Mobility Group - unicast or multicast?
Usually unicast but can be multicast
Command to view basic info on Mobility Group
show mobility summary
Command to view basic info on Mobility Group
show mobility summary
CCMP stands for, and is
Counter Mode Cipher Block Chaining Message Authentication Code Protocol
Used in wireless WPA-2
What feature is enabled by default in the following scenario:
enabled automatically for CB21AG and PI21AG clients using WPA/WPA2/CCKM with LEAP, EAP-FAST, EAP-TLS, PEAP (EAP-GTC), or PEAP (EAP-MSCHAP V2)
CCKM - Cisco Centralized Key Management
Typical ROAM time with CCKM
Less than 150ms
How does CCKM work
fast rekeying technique that enables Cisco client devices to roam from one access poin
Local EAP methods
- LEAP
- EAP-FAST
- PEAP
- EAP-TLS
Where is EAP-AKA used?
EAP for Universal Mobile Telecommunications systems Authentication and Key Arrangement
Cellular networks
Not local
Why can EAP-MD-5 not be used for local authentication?
Insecure
What SNR is required for triangulation?
20 or higher
What RSSI is (cisco) recomemnded for accurate location tracking?
-75dBm or higher
BLE-capable devices are
Bluetooth Low Energy
Indoor location racking
No triangulation
AP Monitor Mode
Dedicated Sensor for IDS events and Rogue access points
AP Sniffer Mode
Troubleshoot a network problem by capturing wireless frames
REview in Wireshark
Layer 2 Intra Controller Roam Also caleld
Local-to-local roam
What are the types of wireless access point patterns?
Omnidirectional
Directional
What antenna produces this wireless pattern?
Cisco Sector Antenna
What antennda produces this wireless pattern?
Stadium Patch Antenna
What antenna produces this wireless patern?
Yagi
What antenna produces this type of wireless pattern?
Patch
What antenna produces this type of wireless pattern?
Dipole
802.11k
Client optimized neighbour lists for assisted roaming
Essentially, Client asks AP for knowledge on other AP’s that it knows can meet it’s needs (e.g. same band). Client able to connect wthiout probing
802.11r
Fast Transition mechanism associated with wireless security
AP and client perofrm the Pairwise Master Key in advance -> this PMK is then used with other AP’s
802.11w
Protected Management Frames
802.11v
allows client devices to exchange information about the network topology, including information about the RF environment, making each client network aware, facilitating overall improvement of the wireless network.
Specifically facilitiates:
*Network Assited Power Savings
*Network assited roaming
802.11b is what frequency band?
2.4 GHz
What frequency band do alot of house hold devices, such as microwaves - operate in?
2.4Ghz
802.11b data rates
11Mbps
802.11n data rates
100 Mbps
802.11n Frequency Bands
2.4 Ghz and 5 Ghz
