802.14.4 & Thread Flashcards
6LowPAN is the same as IEEE802.15.4
False
Which of the following frames are required to be transmitted using CSMA/CA?
Data Frames
6LowPAN technology sits on top of …
IEEE 802.15.4
What does IEEE 802.15.4 primarily focus on?
Low-rate wireless personal area networks
6LowPAN uses traditional IPv6 as its networking layer.
False
The full form of 6LoWPAN is …
IPv6 over Low-Power Wireless Personal Area Networks
Assume that a user wants to transmit bit 1 using Direct Sequence Spread Spectrum. The user using “XOR” to generate the same. What is the transmitted signal (in binary) if the chipping sequence is 101011010011?
010100101100
Which of the following are not true about 6LowPAN?
6LoWPAN is based on IPv4 and IPv6 protocols for transmitting packets
Assume Bob is using DSSS to transmit his data to Alice. Bob decided to use the chipping sequence 101101 to transmit his bits. If the length of the packet is 100 bits, how many bit will Bob actually transmit?
Given:
Chipping sequence: 101101 (which is a 6-bit sequence)
Length of the packet: 100 bits
6 x 100 = 600
Which type of modulation is used in IEEE 802.15.4
Direct Sequence Spread Spectrum (DSSS)
Which of the following are used by IEEE 802.15.4?
Direct Sequence Spread Spectrum
CSMA with Collision Avoidance
IEEE 802.15.4 is a basis for which popular IoT communication protocol?
Thread
ZigBee
If the 16-bit address assigned to a device in a 6LowPAN network is 4EA1, what is the IPv6 link local address? Assume the PAN ID is 5678.
FE80::5678:4EA1
If the 16-bit address assigned to a device in a 6LowPAN network is 4EA1, what is the IPv6 link local address?
FE80::4EA1
Which of the following phases are required for a device to re-attach to a Thread Network? (You can select more than one)
Attaching
Which of the following is not a characteristic of Thread?
Devices can easily join the network
IEEE 802.15.4 defines the operation of which network layers?
Data Link Layer
Physical (PHY)
What kind of network topology is supported by IEEE 802.15.4?
Star
Point-to-Point
Mesh
The size of MTU for an 802.15.4 network is equal to 127 bytes. Of which, 802.15.4 header occupies 25 bytes, security option occupies 21 bytes, IPv6 and UDP compressed headers occupy 10 bytes. Given this situation, choose which of the following application layer payloads (only the size of the payload is shown) can be transmitted over the network. Assume Thread protocol is used for the higher layers.
All of the above
Which of the following Full Thread Devices have routing capabilities? (You can select more than one)
Router
Leader
Router Eligible End Device
Which of the following is NOT true about Border Routers in a Thread Network?
There cannot be more than 3 border routers in a Thread Network.
If the EUI64 address of a device is 62::1, what would be its link local IPv6 address. Assume 6LowPAN protocol.
[FE80:0:0:0:22::1]
Assume Bob is using DSSS to transmit his data to Alice. Bob decided to use the chipping sequence 10110100110 to transmit his bits. Bob transmitted 330 bits to Alice. Using this information, calculate how many actual bits represent Bob’s data?
transmitted = 330 bits
chipping = 10110100110 11 bits
by right, this means that the actual bits should be 330/11 = 30
but the given answer is 33 [This should be corrected]
Consider an IEEE 802.15.4 network using Beacon-enabled CSMA/CA. Given this, choose which of the following statements are false:
Contention Free Period uses slotted CSMA.
Contention Access Period is reserved for real-time services.
A part of the beacon internal is busy as coordinator require it to send out MAC command packets
Which of the following is true about Thread Network?
None of the Above
