Câu 7: 400-351: CCIE Wireless Written Exam

Which two statements about 802.11ac wireless LAN technology are true? (Choose two.)

1. A. Antenna design does have to change because 802.11ac occupies different spectrum as 802.11a and 802.11n at 5 GHz
2. B. The 802.11ac IEEE standard allows for theoretical speeds up to 6.9 Gbps in the 5 GHz band, which is 11,5 times those of 802.11n — đáp án hiện tại
3. C. The 802.11ac standard defines downlink and uplink MU-MIMO, which is for the access point sending to multiple clients concurrently and for multiple clients coordinating to transmit separate packets to the access point at the same time — đáp án hiện tại
4. D. The 802.11ac Wave 2 standard limits itself to communicating with a maximum of four clients at a time, using up to a total of eight spatial streams (for all clients) or a maximum of four spatial streams per client in a MU-MIMO transmission
5. E. Client MU-MIMO (802.11ac Wave 2) can be achieved easily via software upgrade assuming the client is at least 802.11ac Wave 1 compatible