martes, 20 de enero de 2015

CCNA Wireless Chapter 9 answers

CCNA Wireless Chapter 9 answers

In a wireless model, frames generally go from a lightweight AP to a WLC
A WLC is…
A WiLAN controller
Active scanning is…
When a client sends probes out

Passive scanning is..
When a client waits for beacons
What comes first, the auth request or the assoc request frame when a client attempts to connect to an AP?
The auth request comes first
Briefly count off the steps for wireless association to an AP
1) Client sends probe
2) AP sends probe response
3) Client sends auth request
4) AP sends auth response
5) Success message sent
6) Association request sent by client
7) Association response sent by AP
8) Client uses RSSI and SNR to determine what speed to send at
Management frames are sent at the …
Lowest possible rate
Data headers are sent at the…
Lowest possible rate
Actual data is sent at the…
Highest possible rate
If a wireless client is sending to a host on a different subnet and has never done so before, it will need to perform the ___ operation to find the ____ address of the __________ gateway
ARP, MAC, default
In an ARP frame sent from a client, the source address is the…the destination address is the…and the receiving address is the…
Host sending ARP
Broadcast because its an ARP broadcast
AP
What interframe space do ACK frames use?
SIFS – short interframe space
The LWAPP adds a ____________ _____________ frames travelling from the AP to the WLC
6 byte header
Who translates 802.11 frames into 802.3 frames in a centralized wireless setup?
The wireless LAN controller
The two main types of WLAN implementation methods are:
1) Distributed (autonomous AP’s)
2) Centralized (LAP + WLC)
WLC’s are responsible for… (5 things)
1) Security policies
2) Intrusion prevention
3) RF management
4) QoS
5) Mobility
LAP’s handle real-time MAC layer services while WLC’s handle non-real-time MAC layer services
Non real time MAC layer services handled by the WLC include:
1) Authentication
2) Association and reassociation (aka mobility)
3) Frame translation and bridging
Public networks broadcast their SSID in a beacon
But private networks wait for probe-requests
In a distributed setup, the address fields are setup as follows in the 802.11 frame:
Field 1: AP = receiving address
Field 2: Source address
Field 3: Destination address
Field 4: Unused
The Ethertype of LWAPP is…
0xBBBB
LWAPP can operate at ______ or ______
Layer 2 or layer 3
If LWAPP is operating at L2, do AP’s need IP’s?
No.
If LWAPP is operating at L3, do AP’s need IP’s?
Yes.
The trunking protocol is called…
802.1q
The trunking protocol adds a ____________ to 802.3 frames
4 byte header
The header added by 802.1q contains what 2 things
1) TPID
2) TCI
The TCI contains…
User priority, 1 bit canonical format, 12 bit VLAN ID
What are the reserved VLAN ID’s?
1 = default
1002 = FDDI
1003 = TR
1004 = FDDINET
1005 = TRNET

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