Which of the following descriptions of cleaning centers is incorrect?

Question

Options

• ABack-injection methods include: policy routing back-injection, static route back-injection, VPN
• BThe cleaning device supports rich and flexible attack prevention technologies, but cannot defend
• CThere are two methods of traffic diversion: static traffic diversion and dynamic traffic diversion.
• DThe cleaning center completes functions such as diversion and cleaning of abnormal traffic, and

• A
  12% (3)
• B
  80% (20)
• C
  4% (1)
• D
  4% (1)

Explanation

Option B is incorrect because cleaning devices are specifically designed to defend against attacks - that is their primary purpose. A cleaning center actively detects, filters, and scrubs malicious traffic (e.g., DDoS floods) while forwarding legitimate traffic to its destination. Claiming the device "cannot defend" directly contradicts its core function.

Why the distractors are correct (and therefore not the answer):

• A is accurate: back-injection (returning cleaned traffic to the network) relies on exactly these three methods - policy routing, static routes, and VPN tunnels.
• C is accurate: traffic diversion is indeed categorized as either static (pre-configured routes) or dynamic (triggered on-demand, typically via BGP signaling when an attack is detected).
• D is accurate: diverting abnormal traffic to the cleaning center and then scrubbing it are the two defining functions of a cleaning center architecture.

Memory tip: Think of a cleaning center like a water purification plant - it receives dirty water (diverts traffic), cleans it (scrubs attacks), and sends it back (back-injection). A plant that "cannot purify" isn't a purification plant. Any answer that says a cleaning device cannot defend is describing the opposite of its purpose.

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