In the Cisco Unified WLAN QoS, which two aspects create the need for collision avoidance mechanisms? (Choose two.)
Shared media: Multiple nodes share the frequency and only one can successfully transmit at a time.
Congested plant floors: Workers must maneuver without running into each other.
Half-duplex communication: A radio cannot transmit and receive at the same time.
Smart routing: Traffic is directed automatically according to priority.
Limited budgets: Manufacturers will not spend the money to install enough designated channels.
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