フリー問題

問題文

An engineer is reading which defenses against flooding can rebound on the network that deploys them. Which statement is correct?

選択肢

1. In the survey of denial of service threats, the mechanism meant to cut global routing churn can turn against a network because the flapping routes end up suppressed, a configured ceiling on the count of routes heard from one neighbor often makes matters worse because the attacker can push the legitimate routes out with spoofed ones, and the amplifier that leans on retransmission keeps working while the reflector waits in vain for a reset.
2. In the survey of denial of service threats, the mechanism meant to cut global routing churn can turn against a network because the flapping routes end up truncated, a configured ceiling on the count of routes heard from one neighbor often makes matters worse because the attacker can push the legitimate routes out with spoofed ones, and the amplifier that leans on retransmission keeps working while the reflector waits in vain for a acknowledgment.
3. In the survey of denial of service threats, the mechanism meant to cut global routing churn can turn against a network because the flapping routes end up suppressed, a configured ceiling on the count of routes heard from one neighbor often makes matters worse because the attacker can push the legitimate routes out with stale ones, and the amplifier that leans on retransmission keeps working while the reflector waits in vain for a acknowledgment.
4. In the survey of denial of service threats, the mechanism meant to cut global routing churn can turn against a network because the flapping routes end up truncated, a configured ceiling on the count of routes heard from one neighbor often makes matters worse because the attacker can push the legitimate routes out with stale ones, and the amplifier that leans on retransmission keeps working while the reflector waits in vain for a reset.