Chapter 29: Building a Wireless LAN

Question 1

Which link type is necessary to connect a lightweight AP to a network?

Answer 1

Access mode link

Question 2

Which link type is necessary to connect an autonomous AP that supports three WLANs that correspond to three VLANs.

Answer 2

Trunk mode link

Question 3

Which method do we use to connect to a WLC to configure a new WLAN.

Answer 3

Telnet,SSH, HTTPS or HTTP

Question 4

What correctly describes the single logical link formed by bundling all of a controller’s distribution system ports together?

Answer 4

LAG (Link Aggregation)

Question 5

Which controller interface maps a WLAN to a VLAN?

Answer 5

Dynamic interface

Question 6

What two of things are bound together when a new WLAN is created?

Answer 6

SSID and Controller interface

Question 7

What is the maximum number of WLANs you can configure on a Cisco wireless controller?

Answer 7

512 WLANs and only 16 of them can be actively configured on an AP.

Question 8

Which parameters are necessary when creating a new WLAN with the controller GUI?

Answer 8

SSID and Interface

Question 9

What are the two possible ways to authenticate users to the WLC Management Console?

Answer 9

• Internal list of local usernames

* Against an authentication, authorization, and accounting (AAA) server, such as TACACS+ or RADIUS.

Question 10

Can you configure the WLC on the Web Browser directly after logging in?

Answer 10

No, because by default the WLC starts in monitoring mode. If you want to start changing the configuration you need to click on the Advanced link in the upper-right corner.

Question 11

In cisco switches and router interface and port mean the same thing, is it also the case in WLC?

Answer 11

No, Controllers Ports are physical connections made to an external wired or switched network.
whereas interfaces are logical connections made internally within the controller.

Question 12

What are the types of ports on a WLC?

Answer 12

• Service port: Used for out-of-band management, system recovery, and initial boot functions; always connects to a switch port in access mode.
• Distribution system port: Used for all normal AP and management traffic; usually connects to a switch port in 802.1Q trunk mode.
• Console port: Used for out-of-band management, system recovery, and initial boot functions; asynchronous connection to a terminal emulator (9600 baud, 8 data bits, 1 stop bit, by default)
• Redundancy port: Used to connect to a peer controller for high availability (HA) operation

Question 13

The WLC distrebution LAG ports act as a traditional EtherChannel, would the switch port negotiate the EtherChannel with the LAG port?

Answer 13

No, we must configure the switch ports as an unconditional or always-on EtherChannel.

Question 14

How does the WLC handles VLAN mapping to its Ports?

Answer 14

Cisco wireless controllers provide the necessary connectivity through internal logical interfaces, which must be configured with an IP address, subnet mask, default gateway, and a Dynamic Host Configuration Protocol (DHCP) server. Each interface is then assigned to a physical port and a VLAN ID. You can think of an interface as a Layer 3 termination on a VLAN.

Question 15

What are the Cisco controllers different interface types?

Answer 15

• Management interface: Used for normal management traffic, such as RADIUS user authentication, WLC-to-WLC communication, web-based and SSH sessions, SNMP, Network Time Protocol (NTP), syslog, and so on. The management interface is also used to terminate CAPWAP tunnels between the controller and its APs.
• Redundancy management: The management IP address of a redundant WLC that is part of a high availability pair of controllers. The active WLC uses the management interface address, while the standby WLC uses the redundancy management address.
• Virtual interface: IP address facing wireless clients when the controller is relaying client DHCP requests, performing client web authentication, and supporting client mobility.
• Service port interface: Bound to the service port and used for out-of-band management.
• Dynamic interface: Used to connect a VLAN to a WLAN.

Question 16

Which layer 2 WLAN Security types are available to selection?

Answer 16

• None: Open authentication
• WPA+WPA2: Wi-Fi protected access WPA or WPA2
• 802.1x: EAP authentication with dynamic WEP
• Static WEP: WEP key security
• Static WEP + 802.1x: EAP authentication or static WEP
• CKIP: Cisco Key Integrity Protocol
• None + EAP Passthrough: Open authentication with remote EAP authentication

Question 17

By default what interface does WLC use to contact a RADIUS Server?

Answer 17

Management interface. (You can override this behavior by checking the box next to Radius Server Overwrite Interface so that the controller sources RADIUS requests from the dynamic interface that is associated with
the WLAN.)

Question 18

What are the different classification of the QoS in a Cisco WLC?

Answer 18

• Platinum (voice)
• Gold (video)
• Silver (best effort) (Default)
• Bronze (background)

Question 19

Is there a Timeout to the wireless session in the Cisco WLC?

Answer 19

Yes, by default active and set to 1800 secs.

Question 20

Can you access the management web interface from a WLAN?

Answer 20

Not by default. we can change this on a global basis (all WLANs) by selecting the Management tab and then selecting Mgmt Via Wireless, and checking the box to allow management sessions from any WLAN that is configured on the controller.