Chapter 27: Analyzing Cisco Wireless Architecture Flashcards
What is the name of a Cisco wireless access point that operates in standalone, independent manner?
Autonomous AP
How do you describe the Cisco Meraki cloud-based APs?
Autonomous APs centrally managed.
In what architecture does A lightweight access point participate in?
Split-MAC
How does a lightweight access point communicate with a wireless LAN controller?
Through a CAPWAP tunnel
If we have a lightweight AP in default local mode, do we need a trunk link carrying three VLANs in order to be able to support therr SSIDs that are bound to three VLANs?
No
What is the best WLC deployment model for a large enterprise with around 3000 lightweight APs?
Unified
If a lightweight AP provides at least one BSS for wireless clients, which mode is it using?
Local
What is the default mode for a lightweight AP?
The Local mode
In a wireless cloud-based architecture, do the Data transmission between the wireless devices need to be passed to the cloud?
No, the cloud central console is only used to bring management functions into the data plane.
What is a control plane in wireless networks?
It is the Traffic used to control, configure, manage and monitor the AP itself
What is a data plane in wireless networks?
It is End-user traffic passing through the AP
What is a lightweight AP?
It is an AP that only handles the real-time 802.11 operation. All the management, control, QoS. monitor and security functions are now centrally administrated
Why does the Split-MAC architecture need CAPWAP?
The Control and Provisioning of Wireless Access Points (CAPWAP) tunneling protocol encapsulates the data between the LAP and WLC within new IP packets. The tunneled data can then be switched or routed across the campus network.
CAPWAP consists of two separate tunnels, What are they?
- CAPWAP control messages: used to configure the AP and manage its operation. (encrypted)
- CAPWAP data: Used for packets traveling to and from wireless clients that are associated with the AP.
(not encrypted by default)
Which port do CAPWAP control and data use respectively?
CAPWAP control : UDP 5246
CAPWAP data : UDP 5247
How can we assure that no one can add an unauthorized AP to the Wireless network managed by WLC?
Every AP and WLC must authenticate each other with digital certificates. An X.509 certificate is preinstalled in each device when it is purchased.
How many APs can a WLC support in different deployment scenarios?
- In a centralized (Unified) WLC 6000 APs
- In a Cloud-based (VM) WLC 3000 APs
- In an Embedded WLC 200 APs
- In Cisco Mobility Express WLC 100 APs
What is an Embedded WLC?
It is a WLC that share the same hardware with another device as a switch for example.
What is a Cisco Mobility Express WLC?
It is an AP that also operates as a WLC.
Name the modes a lightweight cisco AP can operate with.
a. Local
b. Monitor
c. FlexConnect
d. Sniffer
e. Rogue detector
f. Bridge
g. Flex+Bridge
h. SE-Connect
What does an AP with Monitor mode active do?
The AP does not transmit at all, but its receiver is enabled to act as a dedicated sensor.
What does an AP with FlexConnect mode active do?
An AP at a remote site can locally switch traffic between an SSID and a VLAN if its CAPWAP tunnel to the WLC is down and if it is configured to do so.
What does an AP with Sniffer mode active do?
An AP dedicates its radios to receiving 802.11 traffic from other sources, much like a sniffer or packet capture device. The captured traffic is then forwarded to a PC running network analyzer software such as Wildpackets OmniPeek or WireShark, where it
can be analyzed further.
What does an AP with Rogue detector mode active do?
An AP dedicates itself to detecting rogue devices by correlating MAC addresses heard on the wired network with those heard over the air. Rogue devices are those that appear on both networks.
What does an AP with Bridge mode active do?
An AP becomes a dedicated bridge (point-to-point or point-to-multipoint) between two networks. Two APs in bridge mode can be used to link two locations separated by a distance. Multiple APs in bridge mode can form an indoor or outdoor mesh network.
What does an AP with Flex+Bridge mode active do?
FlexConnect operation is enabled on a mesh AP.
What does an AP with SE-Connect mode active do?
The AP dedicates its radios to spectrum analysis on all wireless channels. You can remotely connect a PC running software such as MetaGeek Chanalyzer or Cisco Spectrum Expert to the AP to collect and analyze the spectrum analysis data to discover sources of interference.
