Practice Q's - Wireless Flashcards
Which three methods can be used to manage Cisco APs that are running autonomously? (Choose three.)
A. WLSE
B. WLC
C. WCS
D. CLI
E. Web interface
Answer: A,D,E
Explanation:
The three methods that can be used to manage autonomous APs are WLSE, CLI, and web interfaces. Autonomous access points (APs) maintain their management functionality and can be connected directly and configured. The wireless LAN solution engine (WLSE) allows for centralized coordination of autonomous APs. The WLSE can also work in coordination with another Cisco service, wireless domain services (WDS).
The WDS enables the APs to provide fast, secure roaming between APs. The WDS registers all client devices in the subnet, establishes session keys for them, and caches their security credentials. When a client roams to another access point, the WDS device forwards the client’s security credentials to the new access point
Wireless LAN controller (WLC) is a physical controller that provides centralized control of a WLAN environment. APs that are being managed by a WLC function in lightweight mode.
Wireless control system (WCS) is a software package that allows for management of a WLAN environment, managing one or multiple WLCs. APs managed by WCS function in lightweight mode.
In what mode does an LWAPP-enabled access point operate?
A. lightweight mode
B. autonomous mode
C. WGB
D. ad hoc mode
Answer: A
Explanation:
Lightweight access point protocol (LWAPP)-enabled access points operate in lightweight mode. LWAPP is a protocol used to allow centralized management of APs. The management components are removed from the APs, and a WLAN controller provides a single point of management. This controller coordinates WLAN access, managing the load on the APs and user movement between APs. Upon starting, an LWAPP-enabled access point must obtain an IP address. It can then discover the controller using DHCP, DNS, or a subnet broadcast. When multiple wireless controllers are detected by an AP, it chooses to associate with the controller that has the fewest existing associated APs.
Individually configured APs that operate without central management are operating in autonomous mode. This would be the opposite of lightweight mode, which is made possible by LWAPP. Autonomous access points can be upgraded to lightweight. If they are upgraded, they will only function in conjunction with a WLAN controller. Moreover, when an autonomous access point is upgraded to lightweight, the console port only provides read access to the unit.
Characteristics that autonomous and lightweight access points have in common:
A wireless gateway bridge (WGB) is used to connect a computer without a wireless network card to a wireless network, but not separate WLANs. The WGB can connect up to eight computers to a WLAN. The WGB connects to the root AP through a wireless interface.
Ad hoc is a WLAN mode used for peer-to-peer connectivity. Ad hoc mode allows wireless-enabled computers to communicate with each other without having an AP involved.
What protocol allows for centralized management of multiple wireless access points?
A. WPA
B. WEP
C. ad hoc
D. LWAPP
Answer: D
Explanation:
Lightweight access point protocol (LWAPP) is a protocol used to allow centralized management of access points (APs). The management components are removed from the APs and centralized into a wireless LAN controller. This controller can coordinate WLAN access, managing the load on the APs and user movement between APs. A lightweight AP receives control and configuration from the WLAN controller.
LWAPP defines the following activities:
The processing of 802.11 data and the handling of management protocols and access point capabilities is distributed between the lightweight access point and the WLAN controller. For example, the AP handles the transmission of beacon frames and responses to probe request frames and the controller handles authentication. The WLC enhances:
When lightweight APs are used, the data path from one wireless station to another includes the AP and its controller.
Wi-Fi protected access (WPA) is an encryption and authentication protocol for wireless access. It supports 802.1x authentication and EAP on a wireless client. The AP would function as the authenticator.
WEP is a wireless encryption protocol that uses static keys and no authentication.
Ad hoc is a WLAN mode used for peer-to-peer connectivity. Ad hoc allows wireless-enabled computers to communicate with each other without having an AP involved.
