NET 211 - Wireless Networking
Review for Second Test
The following questions are provided to help you study for the second
test. Do not expect to see these exact questions on the test.
- How many layers are in the ISO-OSI network model? What are their names?
- In which direction does an outbound message flow through the ISO-OSI
- What is remarkable about narrowband transmission with regard to IEEE
- What are some of the reasons to prefer spread spectrum tranmission
over narrowband transmission?
- What is the purpose of frequency hopping spread spectrum transmission?
- What was the "human pressure" that led Hedy Lamarr and
George Antheil to invent FHSS?
- What is dwell time, with regard to FHSS? What must happen when it
- How often does a Bluetooth transmitter change to a new frequency?
- Which layer of he ISO model is associated with data clusters called
- The text introduces Media Access Control functions as part of the
MAC layer. It is actually a sublayer, of what real layer?
- The text explains that the Physical layer is considered to have sublayers
with regard to wireless methods. What are those sublayers?
- What are the main three sections of an 802.11b frame?
- What is the frequency band used by 802.11b? What about 802.11a?
- What are the major drawbacks of 802.11a and 802.11b?
- What kind of modulations were used in 802.11a? Why were more and
more complicated methods necessary?
- How many non-overlapping channels are available in the US under 802.11b?
- How many non-overlapping channels are available in the US under 802.11a?
- How many non-overlapping channels are available in the US under 802.11n?
Why is that a complicated answer?
- What is a guard interval?
- One of the distinguishing features of 802.11n is its 77 MCS types.
Which are the most important, and why?
- What is a Basic Service Set?
- What is the difference between a Service Set Identifier, and a Basic
Service Set Identifier?
- What is a Basic Service Area?
- What does dynamic rate switching do to data rates from one end of
a BSA to the other?
- What is the definition of an Extended Service Set that references
- Compare Layer 2 roaming to Layer 3 roaming.
- How is an Independent Basic Service Set different from the other
two service set types?
- How does a Service Data Unit become a Protocol Data Unit? Why does
- What is a Maximum Transmission Unit? What are the values for 802.3
and 802.11 LANs?
- What is the most common strategy for setting a limit on MTU size
in wireless LANs?
- What is some of the information that we expect to find in a beacon
- What kind of frame holds the BSSID?
- What is the difference between passive and active scanning?
- Compare Open System Authentication with Shared Key Authentication.
- What are the two main options for wireless LANs under the Distributed
- What is the hidden node problem? Why would it not occur in an 802.3
- What are some common home or office devices that emit RF interference
on the 2.4 GHz band?
- What are two building materials that commonly obstruct RF signals?
- Think about the differences between a manual site survey and a predictive
site survey. Which is likely to be more accurate? Why?
- What is a spectrum analyzer? Why is it a more complicated tool than
an 802.3 sniffer?
- What should be the standard recommendation about placement of access
points, and channels they use?
- What is the acceptable standard for packet loss in a voice over WiFi
- How do packet delay and jitter affect voice over WiFi systems?