When deploying the service packet, the modular switch first processes it through the uplink interface board, then processes it through the downlink interface board, and finally sends it out through…

Question

Options

• ATRUE
• BFALSE

• A
  17% (11)
• B
  83% (54)

Explanation

Option B is correct because the stated processing order is reversed. In a modular switch, a service packet enters through the downlink interface board (ingress), is forwarded across the switch fabric or backplane, and then exits through the appropriate outgoing interface - not the other way around. The uplink interface board handles traffic toward upstream devices, while the downlink board faces access-layer or end-user connections, meaning the downlink board is typically the first to handle an arriving packet, not the uplink.

Option A is wrong because it accepts a fundamentally incorrect sequence - placing uplink processing before downlink processing inverts the actual ingress-to-egress flow of packet handling in modular architectures.

Memory tip: Think "down before up" - packets arrive down from the access layer (downlink board first), travel through the switch fabric, and only then may traverse an uplink path outward. If the question describes uplink-first processing, treat it as a red flag.

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