wireless/WLC

Question 1

What is the dynamic interface used for?

Answer 1

user-defined use similar to a VLAN, typically used for mapping wireless client data to a specific VLAN.

Question 2

What does the virtual interface do for WLCs?

Answer 2

Allows seamless roaming when multiple controllers are being used, allows DHCP relay, and web authentication/passthrough.

Question 3

What does the management interface do?

Answer 3

it is used for in-band management information, and all L2 LWAPP communications between controller and APs/other WLCs.

Question 4

What does the management interface do?

Answer 4

It controls all L3 communications between a WLC and lightweight AP.

Question 5

Console port -

Answer 5

Uses RJ45/USB, used for boot issues

Question 6

Distribution port -

Answer 6

connects to distribution system (wired network), can form a static LAG.

Question 7

Redundancy port -

Answer 7

used to connect to another WLC for a HA pair

Question 8

Service port/interface -

Answer 8

OOB management/recovery, only supports 1 VLAN, keeps management traffic separate from data.

Question 9

Management interface -

Answer 9

• Allows configuration of the standby HA WLC.

- Uses L2 LWAPP management traffic (SSH/HTTPS/etc), and CAPWAP management tunnels.

Question 10

Virtual Interface -

Answer 10

used for relaying DHCP and web authentication to workstations, and roaming

Question 11

Dynamic interface -

Answer 11

• maps WLAN to VLAN (internal = VLAN 100, guest = VLAN200)

- L3 CAPWAP data tunnel

Question 12

How do you create a new guest WLAN in WLC? (4 steps)

Answer 12

1) click ‘create new’
2) Specify the profile name, SSID, and ID and apply
3) select status: enable
4) change interface group to guest and other settings.

Question 13

How do you configure an internal WLAN with GUI for the CCNA? (3 steps)

Answer 13

1) select internal ‘dynamic interface’ in general tab
2) Select WPA+WPA2 and PSK in L2 security tab
3) Select Web pass-through (capture portal) or web authentication (sign-in) in L3 tab
4) in QoS tab select Platinum for voice

Question 14

-maps WLAN to VLAN
( eg. internal SSID = VLAN 45, guest SSID = VLAN 60)

-L3 CAPWAP tunnel from AP to WLC

Answer 14

Dynamic interface

Question 15

Connects to distribution system (wired network), can form a static LAG.

Answer 15

Distribution port

does not use PAgP or LAGP

Question 16

What is option 43?

Answer 16

dhcp option that tells APs the IP address of their WLC if CAPWAP discovery messages aren’t working.

Question 17

service port vs console port?

Answer 17

Console port - standard rollover RJ45/USB.

Service port - OOB management/recovery, only supports 1 VLAN, keeps management traffic separate from data.

Question 18

Used for relaying DHCP and web authentication to workstations, and seamless roaming.

Answer 18

Virtual Interface -

Question 19

Used for management traffic (SSH/HTTPS/etc), and L2 CAPWAP management tunnel.

Answer 19

Management interface

Question 20

CAPWAP Data Channel Uses what port? Encryption?

Answer 20

UDP port 5247

unencrypted by default

Question 21

CAPWAP Control Channel Uses what port? Encryption?

Answer 21

UDP port 5246

encrypted by default