1. In CSMA/CA, if there has been no traffic sensed for more than the critical
   value of time, the sender sends the frame:

   after waiting for a random amount of time   immediately
                                               -----------

2. Co-channel interference is more of an issue with which of the following
   Wi-Fi bands?

   2.4 GHz   5 GHz
   -------

3. Which of the following security standards is the least secure?

   WEP   WPA   802.11i
   ---

4. In an Extended Service Set (ESS), the group of BSS's have:

   the same SSID   different SSID's
   -------------

5. Briefly describe a situation where you might use wireless instead of
   wired LANs:

   - Hotspots in restaurants, hotels, airports, etc.
   - Mobile users in organizations -  eg, ANU.
   - To connect LANs in nearby buildings.
   - As a backup link to a wired LAN. 
   - To extend a wired LAN, where laying a cable is not possible or
     practical.

6. Name one possible application of Near Field Communications.

   - Pay bus fares - eg, MyWay.
   - Open car doors, turn on ignition
   - RFID tags
   - Share business cards
   - Share webpages between mobile devices
   - Payments using a mobile phone

7. In homes, typically, the following 802.11i mode of operation is used:

   802.1X   Pre-Shared Key (PSK)
            --------------------

8. Which four pieces of information uniquely identify a TCP connection?

   - Source port number 
   - Source IP address
   - Destination port number 
   - Destination IP address