Wireless Exam questions:
Q1. Describe how 802.11d is both similar and different to previous 802.11 physical layer amendments (compare and contrast with 802.11 b/g/a/n/ac)
Q2. What must be sacrificed in order to obtain more gain from an antenna?
Q3. Explain the drawbacks of RTS/CTS message. Approximately how much performance do we lose? Explain a scenario where RTS/CTS messaging is frequently used?
Q4. Outline the process that occurs when a wifi device wishes to transmit. Describe the DCF process?
Q5. How does spectrum allocation in 2.4 GHz and 5GHz band differ?
Q6. You are analysing a packet capture file, obtained through a port mirror on a network switch, and are trying to work out what websites a user has been viewing. The web pages are HTTPS websites, but the user was not using a VPN. What is the best approach to analyse their web browsing?
a. Look at the google search record
b. Crack HTTPS to reveal the contents of the message
c. Use a string search on the contents of the packet
d. Filter for DNS messages, and examine DNS
e. Crack WPA encryption
f. Use an inverse ARP
Q7. How”‹ ”‹are”‹ ”‹errors”‹ ”‹most”‹ ”‹commonly”‹ ”‹detected”‹ ”‹in”‹ ”‹WiFi”‹ ”‹networks?
Q8. Describe”‹ ”‹the”‹ ”‹difference”‹ ”‹between”‹ ”‹the”‹ ”‹attacks”‹ ”‹on”‹ ”‹WEP”‹ ”‹and”‹ ”‹WPA.”‹ ”‹What must”‹ ”‹attackers”‹ ”‹capture”‹ ”‹to”‹ ”‹make”‹ ”‹these”‹ ”‹attacks”‹ ”‹a”‹ ”‹possibility?
Q9. What are the reasons why a 5 GHz radio might perform better than a 2.4 Ghz radio? Relate your lab experience.
Q10. Briefly describe the hidden node problem and a method of dealing with it
Q11. What”‹ ”‹is”‹ ”‹the”‹ ”‹difference”‹ ”‹between”‹ ”‹capturing”‹ ”‹traffic”‹ ”‹in”‹ ”‹monitor”‹ ”‹mode”‹ ”‹and capturing”‹ ”‹traffic”‹ ”‹as”‹ ”‹a”‹ ”‹standard”‹ ”‹WiFi”‹ ”‹station”‹ ”‹
Q12. WPAv1, the software upgrade to WEP, uses which encryption algorithm
Q13. Describe, in detail, one performance improvement that has been made in 802.11 networks. The improvement can be a physical layer improvement or a data link layer improvement. If you do not provide detail about how performance has been improved, and how much of a difference the change has made, you will not be awarded any marks.
Q14. How do WiFi and Mobile broadband technologies, such as 3G and 4G, share the medium? Compare and contrast
Q15. Describe how the capacity and speed of a WiFi network will compare with a Gigabit Ethernet LAN.
Q16. What describe how errors are detected and corrected in 802.11
Q17. Describe some of the applications of wireless sensor networks. Describe how the design objectives for 802.15.4 (Zigbee) differ from the design objectives of a technology like 802.11 (WiFi).
Q18. Describe the medium sharing and duplexing mechanisms in GPON and ADSL
Q19. How, and on what basis, is licensed spectrum divided and allocated between companies that wish to use it. Why is this system used?
Using the best coding rate, the most sophisticated modulation, the widest channels and the lowest guard interval provides the highest data rates. Describe the trade off of each of these elements?
Q21. Describe how packet loss occurs in wired networks and how packet loss occurs in wireless networks. Discuss and compare the different reasons why packets are lost.
Q22. What is the frequency, Modulation and maximum data rate 802.11ac?
Q23. Describe the two data link layer improvements in 802.11n
Q24. Describe what dBi and dBd are. What are they a measure of?
Q25. A client has asked you to build a network for their digital media company. The company does a lot of 1080p film editing and this requires them to be constantly sharing 100GB files over the LAN.
What technology should they use to connect their workstations to the network?
c. Gigabit Ethernet
Which of the following statements is True?
a. This is a frame in an ad hoc network
b. This frame is corrupt and will be indecipherable to the receiver
c. This frame is travelling from the wired network to a wireless device
d. This frame has been encrypted using the RC4 Cipher
Q27. Describe the physical layer improvements in 802.11ac
Q28. A client has bought some wireless equipment and handed it to you to install a point to point wireless link in the 2.4 GHz band. There is a 14dB antenna, a cable with 1dB of loss and a radio with a tx power that can be set anywhere between 1mW and 400mW. What is the maximum power that you could operate this radio at, while still remaining within ACMA's legal limits.
Q29. Describe two benefits to multi hop ad hoc networks, then describe why it is such a difficult problem to solve.
Q30. Compare and contrast how WiFi and Mobile broadband technologies, such as HSPDA and LTE, share the medium.
Which of the following statements is true
a. The 802.11e standard is in use
b. The 802.11g standard is in use
c. The 802.11h standard is in use
d. The 802.11i standard is in use
e. The 802.11n standard is in use
f. The 802.11a standard is in use