CCNP switch slides 16 Flashcards
source
http://www.coursehero.com/flashcards/430794/CCNP-SWITCH-642-813-Wireless/
If an AP wants to service multiple SSIDs, what must it connect to the physical switched network with?
a Trunk link!
In regard to Wireless technology, what is an HREAP and what does it do?
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.)
When setting up the switchport, does a wireless LAP need to have a trunk port or an access port?
Access port! Everything else is handled trough the LWAPP/CAPWAP tunnel!
LAPs and WLCs come with what type of certificate in order to authenticate with one another?
X.509
The division of labor used by the Cisco Unified Wireless Network in regard to LAPs and WLCs is known as what type of architecture?
a Split-MAC architecture.
Explain Inter-controller roaming on the same IP subnet.
The WLCs in question will simply exchange a mobility message, where information about the client is sent from one WLC to another.
What network layer should a WLC be located at?
Distribution layer!
What happens when a LAP loses its connection with the WLC?
it will reboot and attempt to locate another WLC.
What is a mobility group in wireless roaming? How many WLCs with one support?
Mobility groups are collections of WLC that allow inter-controller roaming between members of the same group. You can have 24 WLCs.
What is an SSID, and if two device have different SSIDs, can they communicate?
Service Set Identifier, and No. SSIDs must match to communicate.
How many WLC can a single LAP know about.
- Primary, secondary, tertiary.
In 802.11 what is the amount of time called that all stations must wait before transmitting?
DCF interframe Space, or DIFS.
What are the two types of traffic that are transmitted over LWAPP/CAPWAP and which one is encrypted?
Control messages (encrypted!), and normal data.
What is an optional serve platform that can be used as a single GUI front-end to all the WLCs in a network?
the Wireless Control System.
What is the difference between an IBSS, a BSS, and an ESS?
-IBSS is ad-hoc.-BSS is only one AP.-ESS connects more than one AP.
What three things can an AP require of a wireless client before it will be allowed to communicate?
matching SSID, compatible wireless data rate, and Authentication credentials.
What is the technical term for an Ad-Hoc network?
Independent Basic Service Set (IBSS)
What wireless mode is an AP that is standalone or autonomous in?
Autonomous mode!
What has to happen for a client to roam between two WLCs that are NOT in the same mobility group?
They must get a new IP and their session information will be dropped.
Explain Inter-controller roaming on different IP subnets.
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.
What is a cell and what is roaming?Define the difference between layer 2 and layer 3 roaming.
-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.
In simple terms, a Wireless AP is in charge of mapping a VLAN to a(n) ____?
SSID!
What is an intra-controller roam, and what happens to allow this to occur?
-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.
