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34 Cards in this Set

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What are the components that are included in the Cisco unified wireless network?
Mobility services, network management, network unification, access points, and client devices.
These five interconnected components are used when designing a wireless network with Cisco.
A wireless LAN is similar to what wired LAN model?
Shared
A wireless LAN works similarly to a wired shared network, where only one device can "speak" at the same time while others listen.
What is the protocol that is used by wireless LANs to avoid having a collision on the network?
Carrier Sense Multiple Access / Collision Avoidance (CSMA/CA)
Unlike most wired LANs, wireless LANs use Collision Avoidance instead of Collision Detection.
What is the IEEE standard that defines wireless LANs?
802.11
All the current wireless LAN standards are defined in IEEE 802.11. The currently used standards are 802.11a, b, g, and n (almost ratified as of this writing).
What is the name of the device that is used by wireless clients to access the network?
Access point
An access point is a device used by wireless clients to connect to the wireless network. The access point has connectivity to both the wired (if there is one) and wireless networks and acts as a connection point.
What is the recommended overlap that should be used by adjacent wireless cells?
20%
It is recommended that in order for wireless users to have sustained coverage, a 20% overlap in cell coverage should be designed.
What is the name of the identifier that is used to logically separate wireless networks?
Service Set Identifier (SSID)
The SSID is used by wireless networks to provide a name to each specific wireless network.
How is the SSID broadcast out to the wireless clients?
Wireless beacon
The access points on wireless networks broadcast beacons to advertise available services; within this beacon message is the SSID (if there is one).
What is the name of the process of passing from one wireless cell to another one without disconnection?
Roaming
Wireless networks can be configured so that clients can roam from one wireless cell to another without interruption of services.
Which of the wireless devices initiates the roaming relationship when traveling between multiple wireless cells?
Wireless client
The wireless client is responsible for dealing with the roaming behavior between wireless cells.
Under what conditions is a roaming relationship considered layer 2 roaming?
Both of the wireless cells are in the same IP subnetwork.
When layer 2 roaming, a client is transitioning from being associated with one cell to another, but staying in the same IP subnetwork, and thus not requiring an IP address change.
What protocol is used between access points to communicate that a client is roaming?
Inter-Access Point Protocol (IAPP)
IAPP is used between APs to communicate that a client is moving from one AP to another.
What are the two different methods of wireless implementation provided by Cisco?
Standalone (autonomous) and Controller-Based (lightweight)
Cisco offers two different methods to deploy wireless networks: using standalone (autonomous) access points or controller- based (lightweight) access points and controllers.
What is the name of the component that is used for radio frequency management on standalone wireless networks?
Wireless Domain Services (WDS)
WDS provides both radio frequency management and roaming capabilities.
What is the name of the component that is used for WLAN management when using standalone access points?
CiscoWorks Wireless LAN Solution Engine (WLSE)
When using access points in standalone mode, the WLSE is used to manage the wireless LAN.
What is the name of the component that is used to manage access points in a controller-based wireless network?
Wireless LAN Controller (WLC)
The WLC is used to control, configure, and monitor the access points.
What is the name of the component that is used for WLAN management when using a controller-based wireless network?
Wireless Control System (WCS)
WCS is used for WLAN management when using access points in a controller-based wireless network.
What are the two devices that are used to process the 802.11 protocol in a controller-based wireless network?
Access points and Wireless LAN Controller (WLC)
The controller-based wireless network uses split-MAC, which uses an access point for half the functionality and the WLC for the other half.
Which 802.11 functionality is handled by the Wireless LAN Controller?
802.11 authentication, association, and reassociation, and frame translation and bridging
The WLC is responsible for the non-time-sensitive 802.11 functionality and where system-wide visibility is required.
What is the name of the protocol that is used to transport data and control messages between the access point and the Wireless LAN Controller?
Lightweight Access Point Protocol (LWAPP) or Control and Provisioning of Wireless Access Point (CAPWAP)
LWAPP is used when using software versions before 5.2. CAPWAP is used when using software version 5.3 and above.
What type of encryption is used by LWAPP and CAPWAP for communications between the access points and the Wireless LAN Controller?
Advanced Encryption Standard (AES)
AES is used on all LWAPP and CAPWAP communications between the access points and the Wireless LAN Controller.
Which transport protocol is used by LWAPP and CAPWAP?
UDP
UDP is used by both LWAPP and CAPWAP for communications between the access points and the Wireless LAN Controller.
How does the traffic flow on a controller-based wireless network?
All traffic goes from the wireless device through the wireless controller.
In a controller-based wireless network, all traffic goes through a wireless controller and then back out, either to another wireless device or to the wired network.
What are the port numbers that are used by CAPWAP?
UDP 5246, 5247
CAPWAP uses UDP ports 5246 and 5247. 5246 is used for the control channel, and 5247 is used for the data channel.
Which port numbers are used by LWAPP?
UDP 12222, 12223
LWAPP uses UDP ports 12222 and 12223. 12222 is used for the data channel, and 12223 is used for the control channel from the wireless controller to the access points. Traffic from the access point to the wireless controller uses ephemeral ports.
What series of WLCs are used to provide a standalone controller solution?
2100, 4400, and 5500 series
The current series of WLCs that provide a standalone solution are the 2100, 4400, and 5500 series Wireless LAN Controllers.
What is the name of the module that is used in the 6500 series switch to provide wireless controller capabilities?
Wireless Services Module (WiSM)
The WiSM is used in the 6500 series switches to provide wireless controller capability for up to 300 access points.
Which VLAN is required for standalone access point management?
Native
Standalone access points require a native VLAN to be configured for their management.
What type of port is required between a standalone access point and a switch?
Trunk port
A trunk port is required on a standalone access point connection to a switch, to handle both the management VLAN and several data VLANs (typically one VLAN per SSID).
What type of port is required between a controller-based access point and a switch?
Access port
Only an access port is required from a controller-based access point to a switch, because VLANs and management are handled at the wireless controller.
Where is the Wireless LAN Controller (WLC) typically located in the network?
In distribution closets or at a core central location
The WLCs are typically located either at the Distribution layer in a wiring closet or at a core central location. The exact location depends on the size of the network and the type of traffic that is required. WLCs do not have to be in the same subnet as the access points that they control.
By default, what is the state of port aggregation when using the Cisco Catalyst 6500 series Wireless Services Module (WiSM) module?
Enabled
By default, the WiSM module has port aggregation enabled.
How many port aggregation bundles are supported by the 4400 series controller?
One
The 4400 series controllers support only one port aggregation bundle (Etherchannel).
Which of the port aggregation protocols is supported by the 4400 series controllers?
None
The 4400 series controllers do not support Link Aggregation Control Protocol (LACP) or Port Aggregation Protocol (PaGP); therefore, the switch must be configured to statically enable a port aggregation bundle.