【单项选择题】
Refer to the exhibit. <br /> What type of attack is being defended against？ （）<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/201807301110426.jpg" /><p> Refer to the exhibit. <br /> What type of attack is being defended against？ （）<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/201807301110426.jpg" /></p>
A、A. snooping attack
B、B. rogue device attack
C、C. STP attack
D、D. VLAN attack
E、E. spoofing attack
F、F. MAC flooding attack
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