CCNP switch slides 16

Question 1

source

Answer 1

http://www.coursehero.com/flashcards/430794/CCNP-SWITCH-642-813-Wireless/

Question 2

If an AP wants to service multiple SSIDs, what must it connect to the physical switched network with?

Answer 2

a Trunk link!

Question 3

In regard to Wireless technology, what is an HREAP and what does it do?

Answer 3

Hybrid Remote Edge Access Point. In the event the LAP loses its connection to the WLC, it allows the users to maintain their connections without forcing the LAP to reboot in order to reconnect to a different WLC. (makes it act like an autonomous AP.)

Question 4

When setting up the switchport, does a wireless LAP need to have a trunk port or an access port?

Answer 4

Access port! Everything else is handled trough the LWAPP/CAPWAP tunnel!

Question 5

LAPs and WLCs come with what type of certificate in order to authenticate with one another?

Answer 5

X.509

Question 6

The division of labor used by the Cisco Unified Wireless Network in regard to LAPs and WLCs is known as what type of architecture?

Answer 6

a Split-MAC architecture.

Question 7

Explain Inter-controller roaming on the same IP subnet.

Answer 7

The WLCs in question will simply exchange a mobility message, where information about the client is sent from one WLC to another.

Question 8

What network layer should a WLC be located at?

Answer 8

Distribution layer!

Question 9

What happens when a LAP loses its connection with the WLC?

Answer 9

it will reboot and attempt to locate another WLC.

Question 10

What is a mobility group in wireless roaming? How many WLCs with one support?

Answer 10

Mobility groups are collections of WLC that allow inter-controller roaming between members of the same group. You can have 24 WLCs.

Question 11

What is an SSID, and if two device have different SSIDs, can they communicate?

Answer 11

Service Set Identifier, and No. SSIDs must match to communicate.

Question 12

How many WLC can a single LAP know about.

Answer 12

3. Primary, secondary, tertiary.

Question 13

In 802.11 what is the amount of time called that all stations must wait before transmitting?

Answer 13

DCF interframe Space, or DIFS.

Question 14

What are the two types of traffic that are transmitted over LWAPP/CAPWAP and which one is encrypted?

Answer 14

Control messages (encrypted!), and normal data.

Question 15

What is an optional serve platform that can be used as a single GUI front-end to all the WLCs in a network?

Answer 15

the Wireless Control System.

Question 16

What is the difference between an IBSS, a BSS, and an ESS?

Answer 16

-IBSS is ad-hoc.-BSS is only one AP.-ESS connects more than one AP.

Question 17

What three things can an AP require of a wireless client before it will be allowed to communicate?

Answer 17

matching SSID, compatible wireless data rate, and Authentication credentials.

Question 18

What is the technical term for an Ad-Hoc network?

Answer 18

Independent Basic Service Set (IBSS)

Question 19

What wireless mode is an AP that is standalone or autonomous in?

Answer 19

Autonomous mode!

Question 20

What has to happen for a client to roam between two WLCs that are NOT in the same mobility group?

Answer 20

They must get a new IP and their session information will be dropped.

Question 21

Explain Inter-controller roaming on different IP subnets.

Answer 21

When a client roams into a new controller, that controller creates an Ether-IP tunnel from itself to the WLC when the clients IP natively resides. Incoming traffic then flows to the original WLC and then through the tunnel to the new WLC.

Question 22

What is a cell and what is roaming?Define the difference between layer 2 and layer 3 roaming.

Answer 22

-A cell is an AP’s coverage area.-roaming is moving from one AP to another.-L2 roaming maintains the same IP for the client. -L3 roaming means the client must change IPs when it changes APs.

Question 23

In simple terms, a Wireless AP is in charge of mapping a VLAN to a(n) ____?

Answer 23

SSID!

Question 24

What is an intra-controller roam, and what happens to allow this to occur?

Answer 24

-When a client’s wireless association stays within the same controller.-The controller simply updates its tables to use the LWAPP/CAPWAP tunnel to the new LAP.

Question 25

What does the ‘Cisco Unified Wireless Network’ suggest doing?

Answer 25

Using LAPs and WLCs to centralize certain wireless functions on a network.

Question 26

What are the 5 steps that a LAP must do to bootstrap and become active?

Answer 26

1. Get a DHCP IP address.2. Learn the IP of any available WLC.3. Send a join request, and receive a reply.4. Download newer software (if necessary).5. Build a secure LWAPP/CAPWAP tunnel.

Question 27

What two types of tunnels are used by LAPs and WLCs to communucate?

Answer 27

-LWAPPs (Lightweight Access Point Protocol) (Cisco Proprietary)-CAPWAP (Control and Provisioning Wireless Access Point protocol) (standards-based)

Question 28

Can traffic from two clients attached to the same AP pass directly through the air to the destination?

Answer 28

No, it must travel through the AP. only Ad-Hoc (IBSS) can go from source directly to destination without the AP.

Question 29

Can WLCs support Etherchannel autonegotiation?

Answer 29

No they cannot! You must enable unconditional Etherchannel on the Switch in order to establish the Etherchannel.

Question 30

What are the two ways that a LAP can discover the IP address of the WLC?

Answer 30

Through DHCP option 43, or if in the same broadcast domain they can talk directly to one another via broadcast.

Question 31

What is an Anchor point and Foreign agent in inter-controller roaming?

Answer 31

-Anchor point, the WLC that a client originally joined the wireless network at.-Foreign agent, any WLC serving the client from a different subnet.