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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
at the google search record
HTTPS to reveal the contents of the message
a string search on the contents of the packet
for DNS messages, and examine DNS
an inverse ARP
Q7. How”‹ ”‹are”‹ ”‹errors”‹ ”‹most”‹ ”‹commonly”‹ ”‹detected”‹ ”‹in”‹
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
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
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).
Describe the medium sharing and duplexing mechanisms in GPON and ADSL
How, and on what basis, is licensed spectrum
divided and allocated between companies that wish to use it. Why is this system
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
Q23. Describe the two data link
layer improvements in 802.11n
Q24. Describe what dBi and dBd
are. What are they a measure of?
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.
technology should they use to connect their workstations to the network?
of the following statements is True?
is a frame in an ad hoc network
frame is corrupt and will be indecipherable to the receiver
frame is travelling from the wired network to a wireless device
frame has been encrypted using the RC4 Cipher
Q27. Describe the physical layer
improvements in 802.11ac
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
Q30. Compare and contrast how
WiFi and Mobile broadband technologies, such as HSPDA and LTE, share the
of the following statements is true
802.11e standard is in use
802.11g standard is in use
802.11h standard is in use
802.11i standard is in use
802.11n standard is in use
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