Understanding frame types

8 important questions on Understanding frame types

How many addresses can there be in the 802.11 frame?

4: address1/tm4 (RA [receiver], TA [transmit], DA [destination])

What is the purpose and meaning of DIFS?

Distributed Interframe Space: Default period of silence, after every standard priority frames

What is the purpose and meaning of RIFS?

Reduced Interframe Space: For 802.11N (not AC it uses aggregation of frames) burst of frames. The shortest amount of time of silence.
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What is the purpose and meaning of SIFS?

Short Interframe Space: USed between data and ack frames (CTS 802.11g protected)

What is the purpose and mening of EIFS?

Extended Interface Space: The maximum amount of time, used after collisions, and before transmissions.

When are the DS bits in a 802.11 frame all the same?

They should be 0:0 or 1:1. They are when DLS (Wifi Direct) of from AP connectivity only. 1:1 is only when the AP's are part of the Distribution System as in Wifi Meshing

Which 3 Site Survey methods do you have?

Predictive, Passive (scanning only), Active (AP-On-A-Stick)

At what dB level does Cisco defines the Cell Edge?

At -67 dBm

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