When a router has to make a rate transition from LAN to WAN, what type of congestion needs should be considered in the network design?

Question

Options

• ARX-queue deferred
• BTX-queue deferred
• CRX-queue saturation
• DTX-queue saturation
• ERX-queue starvation
• FTX-queue starvation

• A
  2% (1)
• C
  10% (5)
• D
  4% (2)
• E
  2% (1)
• F
  82% (42)

Explanation

When a router transitions traffic from a high-speed LAN interface to a low-speed WAN interface, packets arrive at the router faster than the WAN link can transmit them. This backs up the transmit (TX) queue on the WAN egress interface. Without Quality of Service (QoS), the TX queue fills with all types of traffic indiscriminately, and high-priority traffic (voice, critical data) gets 'starved'-it cannot get into the queue or get scheduled for transmission because lower-priority traffic consumes all available queue slots and bandwidth. This is TX-queue starvation (Choice F). The 'TX' (transmit) qualifier is correct because the bottleneck is on the outgoing WAN interface, not on a receive queue. Network designs must account for this with QoS policies (queuing, scheduling, traffic shaping) to ensure critical traffic is not starved at the WAN egress point.

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