Comprehensive and Detailed In-Depth Explanation:
Understanding the Table and Traffic Suppression Configuration
Port Name
Type
Rate (Min/Max)
Mode
Action
Punish-Status
Trap
Log
Int
Last-Punish-Time
GE0/0/1
Broadcast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
GE0/0/1
Multicast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
GE0/0/1
Unicast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
Key Observations from the Table:
Traffic suppression (or rate limiting) is configured on interface GE0/0/1 for broadcast, multicast, and unicast traffic.
Thresholds:
If the traffic exceeds the configured threshold (2000 pps), the action is to "Block".
The interface is still "Normal" (not shut down), meaning exceeding 2000 pps does not disable the port.
Logging is enabled (Log: On), but trapping (Trap: Off) is disabled.
Analysis of Each Answer Choice
A. "When the average rate of unknown multicast packets is 1500 pps, GE0/0/1 blocks the multicast packets." ❌ (False)
The blocking threshold for multicast is 2000 pps (Max rate).
If the rate is 1500 pps, it is still below the threshold, so traffic is not blocked yet.
❌ Statement A is incorrect.
B. "When the average rate of known unicast packets is 2500 pps, GE0/0/1 is shut down." ❌ (False)
The table does not indicate that exceeding the max threshold (2000 pps) shuts down the interface.
Instead, it simply blocks packets exceeding the rate limit.
The interface remains "Normal", meaning it is not shut down.
❌ Statement B is incorrect.
C. "After broadcast packets are blocked on GE0/0/1, broadcast packets are forwarded only when their average rate is lower than 1000 pps." ❌ (False)
The minimum rate is 1000 pps, but there is no indication that traffic resumes forwarding only when it drops below this rate.
The configuration only states blocking when exceeding 2000 pps, but does not enforce a strict reactivation at 1000 pps.
❌ Statement C is incorrect.
D. "The administrator configures traffic suppression on GE0/0/1 of the switch." ✅ (True - Correct Answer)
The table explicitly shows that a traffic suppression policy is applied to broadcast, multicast, and unicast packets on GE0/0/1.
This confirms that the administrator has configured traffic suppression (rate limiting) on this interface.
✅ Statement D is correct.
Final Conclusion:
✅ Correct Answer: D. The administrator configures traffic suppression on GE0/0/1 of the switch.
[Reference:, HCIP-Datacom-Advanced Routing & Switching Technology V1.0 – Traffic Suppression and Rate Limiting, Huawei Official HCIP-Datacom Study Guide – Interface Traffic Control and Traffic Suppression Configuration, Huawei Documentation on Traffic Policing and Broadcast Storm Control, , , , , , ]
