WorksheetsWireless Networks Quiz 3
Total questions: 20
Worksheet time: 15mins
Which of the following are true IEEE 802.11n-2009?
uses OFDM and MIMO
known as WiFi 4 standard
uses multiple antennae
cannot transmit and receive simultaneously
The standard IEEE 802.15.4 has the following features -
Very little power consumption.
Low-cost and low-speed communication.
Very High bandwidth
Ideal for long distance communication
IEEE 802.15.4 -
uses Carrier Sense Multiple Access
uses TIme Division Multiple Access
does not support secure communication
controls power consumption and data rate
How is WSN MAC different from MAC?
WSN MAC requires high throughput
WSN MAC requires low error rates
WSN MAC requires low protocol overhead
WSN MAC requires energy-efficiency
Which of the following are problems specifically for WSN?
Collisions
Overhearing
Idle listening
Protocol Overhead
Which of the following medium access categories are not feasible for large undivided networks?
Centralized Medium Access
Schedule-based Medium Access
Contention-based Medium Access
Distributed Medium Access
Sensor-MAC is a -
Synchronous type MAC
Duty Cycle based MAC
Centralized MAC
Randomized MAC
The given figure is a node distribution of a WSN. Which of the labeled nodes have the highest probability of being depleted of energy when S-MAC is used?
A
B
C
D
Which of the following WSN protocols use RSSI sampling to reduce energy while detecting channel activity?
S-MAC
B-MAC
LEACH
RI-MAC
What are the pre-requisites of using LEACH?
Presence of central sink.
Sparse network of nodes.
Ability to communicate with sink.
How many phases are there in a single LEACH round?
1
2
3
4
How are cluster heads changed in LEACH?
Centralized selection
Randomized rotation
Assignment of slot
Distribution of channel
How do nodes in a single cluster communicate among each other?
CDMA
TDMA
FDMA
Difference between RIMA-SP and RIMA-DP is -
RIMA-DP can send two packets at the same time.
RIMA-DP has duplex link.
RIMA-DP has more bandwidth than RIMA-SP.
RIMA-DP polling node can also send data.
What happens when there is collision in RI-MAC?
node sends NTR
nodes perform backoff
node keeps sending data
node sends RTR
What is "white space"?
frequency not used locally
white colored space
empty space between objects
channel used in TV
Why are cognitive radio techniques used?
sense unused spectrum dynamically
intelligently perform frequency scheduling
use free space in spectrum
How many types of stations are there is WRAN?
1
2
3
4
How many types of spectrum measurement are there?
1
2
3
4
What are some uses of WiMAX?
Portable mobile broadband
Alternative to wired access networks
Low-cost communication
Lower power consumption
