Year 9 – Computing – Networking – Focus on Wi-Fi

True or false: Wi-Fi is the same as the Internet?

• TRUE

• FALSE

Which of these are parts of a Wi-Fi network?

• Access Point

• Station

• Modem

• Web server

STA1 is 8 times further away from the AP than STA2. How much weaker is the signal at STA1?

• Half as strong

• Quarter as strong

• 8%

• 64 times weaker

Which of these is the Wi-Fi standard?

• IEEE 802.3

• IEEE 802.11

• IEEE 802.15

• GSM

Why can't a Wi-Fi radio transmit and receive at the same time?

• To save power

• Because the transmitter would deafen the receiver

• Because it only has one antenna

• To give everyone a fair go

What is the first thing a STA does if it has something to transmit?

• Wait a fixed amount of time

• Wait a random amount of time

• Listen to the radio channel

• Transmit to ask if it is OK to send some data

What is the packet that tells a STA that the data arrived OK?

• SIFS

• DIFS

• ACK

• NAK

What do we call the address something is going to?

• BSSID

• Source

• Destination

• Network ID

What was the best data rate of the original IEEE 802.11?

• 9500 bps

• 2 Mbps

• 14.4 Mbps

• 54 Mbps

Which IEEE802.11 amendment introduced multiple antennas and MIMO?

• 11a

• 11n

• 11af

• 11ax