The WAN connection of a Cisco Meraki MX security appliance is congested, and the MX appliance is buffering the traffic from LAN ports going to the WAN ports. High, normal, and low priority queue…

Question

Options

• A4/10 packets
• B2/7 packets
• C2/10 packets
• D5/15 packets

• A
  5% (3)
• B
  71% (42)
• C
  15% (9)
• D
  8% (5)

Explanation

Meraki MX QoS Queue Weighting

Option B is correct because the Cisco Meraki MX uses a 4:2:1 weighted queuing ratio for high:normal:low priority traffic when all queues are congested. With a total weight of 4+2+1=7, normal priority traffic receives 2 out of every 7 forwarded packets.

Why the distractors are wrong:

• A (4/10) - 4 is the high-priority weight, not normal; and the denominator 10 doesn't come from the 4:2:1 scheme at all.
• C (2/10) - The numerator is correct (2 = normal weight), but the denominator should be 7 (sum of all weights), not 10.
• D (5/15) - Simplifies to 1/3, which doesn't correspond to any queue's share in the 4:2:1 model.

Memory tip: Think "4-2-1 sums to 7" - like a countdown (4, 2, 1... launch!). High gets 4/7, Normal gets 2/7, Low gets 1/7. The denominator is always 7 when all queues are in play, so any answer with a different denominator (10, 15) is a trap.

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