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[dotfiles/.git] / .config / Typora / draftsRecover / 2019-9-30 anse 202210.md

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++ What CSMA/CA mechanism is used for medium contention? (Choose all that apply.) 
+
+1. NAV
+2. CCA
+3. **Random backoff timer**
+4. Contention window
+
++ Which field in the MAC header of an 802.11 frame resets the NAV timer for all listening 802.11 stations? 
+
+1. NAV
+2. Frame control
+3. **Duration/ID**
+4. Sequence number
+5. Strictly ordered bit
+
++ The EDCA medium  access method provides for the prioritization of traffic via priority  queues that are matched to eight 802.1D priority tags. What are the EDCA  priority queues called? 
++ TXOP
++ **Access categories**
++ Priority levels
++ Priority bits
++ PT
+
++ ACKs are required for which of the following frames? 
+
+1. **Unicast**
+2. Broadcast
+3. Multicast
+4. Anycast
+
++ What QoS mechanism can be used to reduce medium contention overhead during a frame burst of low-latency traffic?  
+
+1. Delayed Block ACK
+2. Contention period
+3. Contention window
+4. Contention-free period
+5. **Immediate Block ACK**
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