What is the advantage of slotted ALOHA over pure ALOHA?
Anonymous Quiz
50%
Higher channel efficiency
32%
Lower collision rate
18%
Ability to transmit at full channel rate
Which random access protocol has a higher maximum efficiency: Slotted ALOHA or pure ALOHA?
Anonymous Quiz
79%
Slotted ALOHA
7%
Pure ALOHA
7%
Both have the same maximum efficiency
7%
Neither protocol achieves maximum efficiency
requires one master node to poll each of the nodes in a round-robin fashion.
Anonymous Quiz
5%
Rules protocol
90%
polling protocol
4%
traffic protocol
1%
Corona protocol
collision detection … in wired, … with wireless
Anonymous Quiz
2%
difficult – difficult
16%
difficult – easy
83%
easy – difficult
"invites" other nodes to transmit in turn.
Anonymous Quiz
4%
Captain node
5%
Leader node
90%
master node
2%
Coach node
… play role in in determining collision probability
Anonymous Quiz
9%
distance
26%
propagation delay
66%
Both of them
efficient at low load: single node can fully utilize channel
Anonymous Quiz
21%
channel partitioning
53%
random access
26%
taking turns
there is no master node.
Anonymous Quiz
12%
The polling protocol
72%
the token-passing protocol
16%
Both
Inefficient at low load: delay in channel access, 1/N bandwidth allocated even if only 1 active
node!
node!
Anonymous Quiz
54%
channel partitioning
19%
random access
27%
taking turns
control token passed from one node to next sequentially.
Anonymous Quiz
15%
polling
85%
Token Passing
Time Division, Frequency Division
Anonymous Quiz
85%
channel partitioning
6%
random access
10%
taking turns
carrier sensing: easy in some technologies (wire), hard in others
Anonymous Quiz
22%
channel partitioning
68%
random access
10%
taking turns