单选题Data security used to be all about spending big bucks on firewalls to defend data at the network perimeter and on antivirus software to protect individual computers. Internet-based computing, or cloud computing, has changed all that, at the same time expanding exponentially the chances for data thieves and hackers. The cloud creates other opportunities too. a handful of security vendors now deliver security as a service--a one-two punch of hardware and software that monitors and manages an enterprise's data security and bills customers only for the computing power they use. "For years, security was about big companies pushing technology to their customers," says Qualys CEO and founder Philippe Courtot. "Now it's about the customers pulling precisely what they need and providing them with those resources on demand. " Qualys, a privately held company in Redwood Shores, Calif. , was among the first to embrace the service-oriented model, in 1999. Today four different modules of QualysGuard, its flagship offering, are used by more than 3500 organizations in 85 countries. The company performs more than 200 million security audits per year. Courtot knows something about opportunity. The French entrepreneur arrived in Silicon Valley in 1987 and has built a number of companies into big-time players, including Signio, an electronic-payment start-up that was eventually sold to VeriSign in a combined deal for more than $1 billion. As CEO, he rebuilt Verity and transformed cc:Mail, a once unknown firm of 12 people, into a dominant e-mail platform before Lotus acquired it in 1991. "Throughout my career, I've been able to recognize that for a technology to succeed, it must have a purpose," he says. "Technology itself has no value. It's what you do with it that counts. " Under the old paradigm, according to Courtot, enterprises overspent for stand-alone security devices that became unruly and difficult to operate over the long term He says Qualys attacks the flaws in this strategy by streamlining security and tackling most of the service delivery through the cloud. "We control the infrastructure, software updates, quality assurance and just about everything in between," he says. The firm unveiled QualysGuard in 2000. After an infusion of $ 25 million from the venture firm Trident Capital and another $ 25 million from Gourtot, Qualys tweaked the service to focus mostly on vulnerability management. Much of the company's current revenue-sales, topped $ 50 million last year--is being driving by a set of standards established by the Payment Card Industry Security Standards Council (PCISSC). "The PCI standard has been a major driver of business for all of them, especially Qualys," says Avivah Litan, a vice president and analyst at market-research firm Gartner. "When everyone has to comply, there's a lot of work to go around. /

单选题下列不符合心内膜弹力纤维增生症的病变特点是

单选题关于压力感受性反射的叙述，下列哪项不正确?

单选题关于静脉，下列叙述中哪一项是不正确的( )(1992年)

单选题坏死细胞内的蛋白质凝固，常保持其轮廓残影，其坏死类型是

单选题患者女性，40岁，左侧腰部疼痛1年，尿中带血，时有脓尿，尿中可查见结核菌肾盂造影检查，左肾可见空洞。符合该患者疾病的诊断是

单选题心脏收缩力增强时，静脉回心血量增加，这主要是因为( )(1999年)

单选题下列选项中，属于梅毒瘤主要成分的有

单选题伤寒小结中的伤寒细胞来源于

单选题月经血不容易凝固的主要原因是

单选题神经系统活动的基本过程是

单选题红细胞膜上同时含有A和B两种凝集原，血清中无凝集素的血型是

单选题脂肪栓塞患者一般的死亡原因是

单选题在摄取混合食物时，其呼吸商通常为

单选题腺鳞癌是指

单选题A．DNA连接酶B．DNA聚合酶C．反转录酶D．引物酶

单选题急性细菌性痢疾早期的结肠病变为

单选题下列关HCO 3 - 在近端小管重吸收的叙述，正确的是( )(2005年)

单选题氨基酰-tRNA合成酶的特点正确的是

单选题A．缺铁性贫血 B．巨幼红细胞性贫血C．再生障碍性贫血 D．肾性贫血E．脾性贫血