As the Company wireless administrator, you required to be knowledgeable about the
wireless LAN components. Which two statements about these components are true?
(Select two)

In the autonomous access point solution, control is provided by the WLAN controller.
In the lightweight access point solution, WLAN management is provided by the WLAN
Control System (WCS).
In the autonomous access point solution, control is provided by the WDS (Wireless Domain
Services).
Cisco Aironet autonomous access points cannot be supported by the Cisco Unified Wireless
Network.
Ii the lightweight access point solution, WLAN management is provided by the WLAN
Solution Engine (WLSE).
Cisco Aironet lightweight access points cannot be supported by the Cisco Unified Wireless
Network.

A.
Yes. A WDS device is required for the Cisco SWAN autonomous access-point solution.
For deployments that use access-point-based WDS, at least one Cisco SWAN WDS access
point per subnet is required for RF management of that subnet. For deployments that use
the switch-based WDS on the Cisco Catalyst 6500 Series WLSM, up to 300 access points
per device across subnets can be supported by a single Cisco Catalyst 6500 Series WLSM.
References:
www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6306/prod_white_paper0900aecd8
02c18ee_ns337_Networking_Solutions_White_Paper.html
www.cisco.com/en/US/prod/collateral/netmgtsw/ps6380/ps6563/ps3915/prod_qas0900aecd
80278d08.html
QUESTION 130
You need to determine the correct wireless LAN topology for use in the Company network.
Which three statements are true about the various WLAN topologies? (Select three)
In ad hoc mode, the Independent Basic Service Set (IBSS) is a framework in which
mobile clients connect directly without an intermediate access point.

A.
Yes. A WDS device is required for the Cisco SWAN autonomous access-point solution.
For deployments that use access-point-based WDS, at least one Cisco SWAN WDS access
point per subnet is required for RF management of that subnet. For deployments that use
the switch-based WDS on the Cisco Catalyst 6500 Series WLSM, up to 300 access points
per device across subnets can be supported by a single Cisco Catalyst 6500 Series WLSM.
References:
www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6306/prod_white_paper0900aecd8
02c18ee_ns337_Networking_Solutions_White_Paper.html
www.cisco.com/en/US/prod/collateral/netmgtsw/ps6380/ps6563/ps3915/prod_qas0900aecd
80278d08.html
QUESTION 130
You need to determine the correct wireless LAN topology for use in the Company network.
Which three statements are true about the various WLAN topologies? (Select three)
In ad hoc mode, the Independent Basic Service Set (IBSS) is a framework in which
mobile clients connect directly without an intermediate access point.

B.
In Infrastructure mode, the Basic Service Set (BSS) is a framework in which mobile
clients use a single access point for connecting to each other or to wired network resources.

C.
In Infrastructure mode, the Extended Services Set (ESS) is a framework in which two
or more Basic Service Sets are connected by a common distribution system (DS).

D.
In Infrastructure mode, the Independent Basic Service Setet (IBSS) is a framework in
which mobile clients connect directly without an intermediate access point.

E.
In ad hoc mode, the Basic Service Set (BSS) is a framework in which mobile clients
use a single AP for connecting to each other or to wired network resources.

F.
In ad hoc mode, the Extended Services Set (ESS) is a framework in which two or
more Basic Service Sets are connected by a common distribution system (DS)

Explanation:
There is a trend in the WLAN space toward centralized intelligence and control. In this new
architecture, a WLAN controller system is used to create and enforce policies across many
different lightweight access points.

As more vendors migrate to a hierarchical design, and as larger networks are built using
lightweight access points, there is a need for a standardized protocol that governs how
lightweight access points communicate with WLAN systems. This is the role of the Internet
Engineering Task Force’s (IETF’s) latest draft specification, Lightweight Access Point
Protocol (LWAPP). With LWAPP, large multivendor wireless networks can be deployed with
maximum capabilities and increased flexibility.
Q. Is Cisco SWAN WDS required for RF management when the Cisco SWAN autonomous
access point solution is used?

A BSS that stands alone and is not connected to a base is called an Independent Basic
Service Set (IBSS) or is referred to as an Ad-Hoc Network. An ad-hoc network is a network
where stations communicate only peer to peer. There is no base and no one gives
permission to talk. Mostly these networks are spontaneous and can be set up rapidly. AdHoc or IBSS networks are characteristically limited both temporally and spatially.

Fig 1: “Adhoc Mode”

When BSS’s are interconnected the network becomes one with infrastructure. 802.11
infrastructure has several elements. Two or more BSS’s are interconnected using a
Distribution System or DS. This concept of DS increases network coverage. Each BSS
becomes a component of an extended, larger network. Entry to the DS is accomplished with
the use of Access Points (AP). An access point is a station, thus addressable. So, data
moves between the BSS and the DS with the help of these access points.
Creating large and complex networks using BSS’s and DS’s leads us to the next level of
hierarchy, the Extended Service Set or ESS. The beauty of the ESS is the entire network
looks like an independent basic service set to the Logical Link Control layer (LLC). This
means that stations within the ESS can communicate or even move between BSS′s
transparently to the LLC.

Fig 2: Infrastructure Mode
Reference: http://www.tutorial-reports.com/wireless/wlanwifi/wifi_architecture.php