a. Describe RTS/CTS.

20a.) In ________, when a wireless host wishes to send, it first sends a message to the wireless access point asking for permission to send. When the access point sends back a response, the host sending the original message may transmit. All other hosts must wait.

a. CSMA/CA+ACK

b. CSMA/CA 

c. CSMA/CD 

d. RTS/CTS 

b. Is CSMA/CA+ACK  required or optional?

20b.) The 802.11 standard has two mechanisms for media access control. One of two mechanisms is mandatory; it is ________.

a. MAC 

b. CSMA/CA+ACK 

c. RTS/CTS 

d. CSMA/C D 

c. Is RTS/CTS  usually required or optional?

d. Which is more efficient, RTS/CTS  or CSMA/CA+ACK?

20d.) Which of the following is more efficient and faster?

a. CSMA/CA+ACK 

b. RTS/CTS 

c. Both are about equally efficient and fast.

e. When does it make sense to use RTS/CTS?

20e.) When does it make sense to use RTS/CTS?

a. When all devices can hear each other

b. When not all of the devices can hear each other

c. When efficiency is crucial

d. Always