You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack？（） The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.。 Frames with unique， invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.。 The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.。 The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.。 The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.。 Frames with unique， invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.。 None of the other alternatives apply。
领先世界，崛起战略阶段，（）是中国大战略的基本理论形态。 毛泽东思想。 邓小平理论。 三个代表重要思想。 科学发展观。
我国现代文学史上最早的一部白话文小说是（）。
胎心电子监测时孕妇的体位为：（） 仰卧位，暴露腹部。 左侧卧位，暴露腹部。 右侧卧位，暴露腹部。 取半卧位或坐位，暴露腹部。 仰卧屈膝位，暴露腹部。
下列选项中，属于检查应付账款是否计入正确会计期间，是否存在未入账应付账款测试程序的有（）。 检查被审计单位在报告日尚未处理的、不符合要求的购货发票。 检查有货物验收单、入库单但未收到购货发票的经济业务。 检查购货发票与验收单不符或未列明金额的发票单据。 检查报告日的全部待处理凭单，确定是否有漏记的应付账款。
某工序控制图如果出现（）情况，则视为控制异常。
