Which of the following is wrong about ATM ABR congestion control? Each data cell
ID: 3754233 • Letter: W
Question
Which of the following is wrong about ATM ABR congestion control?
Each data cell contains an explicit forward congestion indication (EFCI) bit.
The rate of RM cell interspersion is a tunable parameter, with the default value being one RM cell every 32 data cells.
When a destination host receives an RM cell, it will send the RM cell back to the sender with its CI and NI bits intact.
Each RM cell also contains a 1-byte explicit rate (ER) field.
A.Each data cell contains an explicit forward congestion indication (EFCI) bit.
B.The rate of RM cell interspersion is a tunable parameter, with the default value being one RM cell every 32 data cells.
C.When a destination host receives an RM cell, it will send the RM cell back to the sender with its CI and NI bits intact.
D.Each RM cell also contains a 1-byte explicit rate (ER) field.
Explanation / Answer
Answer : D. Each RM cell also contains a 1-byte explicit rate (ER) field.
Explanation : The ER field must be 2 bytes.
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