Wireless CCNA review

What is recommended for the wireless infrastructure design of an organization?

• Group access points (APs) together to increase throughput on a given channel

• Configure the 1st 3 APs to use Channels 1, 6, 11

• Include at least 2 APs on non-overlapping channels to support load balancing

• Assign physically adjacent APs to the same WI-Fi channel

What is a recommended approach to avoid co-channel congestion while installing access points (APs) that use the 2.4GHz frequency?

• One overlapping channel

• Different overlapping channels

• One non-overlapping channel

• Different nonoverlapping channels

What occurs when overlapping Wi-Fi channels are implemented?

• The wireless network becomes vulnerable to unauthorized access

• Wireless devices are unable to distinguish between different SSIDs

• Users experience poor wireless network performance

• Network communications are open to eavesdropping

What is a function of a Wireless LAN Controller (WLC)?

• Register with a single access point that controls traffic between wired and wireless endpoints

• Use SSIDs to distinguish between wireless clients

• Send LWAPP packets to access points

• Monitor activity on wireless and wired LANs

Answer explanation

Lightweight Access Point Protocol (LWAPP) is a Cisco protocol used for communications between the Wireless LAN Controller (WLC) and APs registered with the controller. It is used by the WLC to control multiple Wi-Fi APs.

Which WLC port connects to a switch to pass normal access point traffic?

• Redundancy

• Distribution system

• Console

• Service

Answer explanation

https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-6/configuration-guide/b_cg76/b_cg76_chapter_011010.html#ID106

A distribution system port connects the controller to a neighbor switch and serves as the data path between these two devices. Each distribution system port is, by default, an 802.1Q VLAN trunk port. The VLAN trunking characteristics of the port are not configurable.

Which 802.11 management frame type is sent when a client roams between access points (APs) on the same SSID?

• Reassociation request

• Probe request

• Authentication request

• Association request

Answer explanation

In WLAN network, reassociation request frame is used by mobile stations in the following scenarios: (1) Moving from one basic service area to the other service area in the same extended service area. (2) Leaving the Wi-Fi network coverage area and comes back to the same area again.

Which mode allows access points (APs) to be managed by Cisco Wireless LAN Controllers (WLCs)?

• Autonomous

• Lightweight

• Bridge

• Mobility express

Answer explanation

Autonomous or heavy weight APs were back in my day...you had to configure each one manually. Lightweight APs need to register with and be controlled by a WLC.

When configuring a WLAN with WPA2 PSK in the Cisco Wireless LAN Controller (WLC) GUI, which two formats are available to select? (Choose two.)

• ASCII

• base64

• Binary

• Decimal

• Hexadecimal

Several new coverage cells are required to improve the WI-Fi network. Which two standard designs are recommended? (Choose two.)

• 5GHz provides increased network capacity with up to 23 non-overlapping channels

• For max throughput, the WLC is configured to dynamically set adjacent APs to the same channel

• 5GHz channel selection requires an autonomous AP

• Adjacent cells with overlapping channels use a repeater AP

• Cells that overlap one another are configured to use non-overlapping channels

Which device controls the forwarding of authentication requests for users when connecting to the network using a lightweight access point?

• TACACS server

• Wireless AP

• Radius server

• Wireless LAN controller