首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
[A] Anti-virus software often bounces a warning back to the sender of an infected e-mail, saying that the e-mail in question can
[A] Anti-virus software often bounces a warning back to the sender of an infected e-mail, saying that the e-mail in question can
admin
2011-02-25
47
问题
[A] Anti-virus software often bounces a warning back to the sender of an infected e-mail, saying that the e-mail in question cannot be delivered because it contains a virus. SoBig. F was able to spoof this system by" harvesting" e-mail addresses from the hard disks of infected computers. Some of these addresses were then sent infected e-mails that had been doctored to look as though they had come from other harvested addresses. The latter were thus sent warnings, even though their machines may not have been infected.
[B] Blaster worked by creating a "buffer overrun in the remote procedure call". In English, that earns it attacked a piece of software used by Microsoft’s Windows operating system to allow one computer to control another. It did so by causing that software to use too much memory.
[C] Though both of these programs fell short of the apparent objectives of their authors, they still caused damage. For instance, they forced the shutdown of a number of computer networks, including the one used by the New York Times newsroom, and the one organizing trains operated by CSX, a freight company on America’s east coast. Computer scientists expect that it is only a matter of time before a truly devastating virus is unleashed.
[D] Most worms work by exploiting weaknesses in an operating system, but whoever wrote Blaster had a particularly refined sense of humour, since the website under attack was the one from which users could obtain a program to fix the very weakness in Windows that the worm itself was exploiting.
[E] One way to deal with a wicked worm like Blaster is to design a fairy godmother worm that goes around repairing vulnerable machines automatically. In the case of Blaster someone seems to have tried exactly that with a program called Welchi. However, according to Mr. Haley, Welchi has caused almost as many problems as Blaster itself, by overwhelming networks with "pings" signals that checked for the presence of other computers.
[F] SoBig. F was the more visible of the two recent waves of infection because it propagated itself by e-mail, meaning that victims noticed what was going on. SoBig. F was so effective that it caused substantial disruption even to those protected by anti-virus software. That was because so many copies of the virus spread (some 500,000 computers were infected) that many machines were overwhelmed by messages from their own anti-virus software. On top of that, one common counter-measure backfired, increasing traffic still further.
[G] Kevin Haley of Symantec, a firm that makes anti-virus software, thinks that one reason SoBig. F was so much more effective than other viruses that work this way is because it was better at searching hard-drives for addresses. Brian King, of CERT, an internet-security centre at Carnegie-Mellon University in Pittsburgh, notes that, unlike its precursors, SoBig. F was capable of "multi-threading": it could send multiple e-mails simultaneously, allowing it to dispatch thousands in minutes.
选项
答案
E
解析
根据前段论述可知。
转载请注明原文地址:https://kaotiyun.com/show/ezp4777K
0
考研英语一
相关试题推荐
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions41-45,choosethemostsuitableonefromthelist(A、B、C、
WhatisthecoreofAdamSmith’seconomicphilosophy?Whichofthefollowingcanbestsummarizethewaytheauthorwritesthep
Withthedevelopmentoftheglobaleconomy,manycompaniesstatetheirbasicobjectiveofengaginginaworldwidemanufacturing
Withthedevelopmentoftheglobaleconomy,manycompaniesstatetheirbasicobjectiveofengaginginaworldwidemanufacturing
Thepersonwhocanseeashipwithoutsomefeelingofexcitementmusthaveverylittleimagination.Eventheideaofleavingthe
Theauthor’sattitudetowardsthecurrentsituationintheexploitationofnaturalresourcesis______Itcanbeinferredfromt
Theword"paradox"(Para.1)means"______".Thechancesofthephysicalsciencesbeingsubjecttogreatchangesarethebiggest
Ah,blissfulsleep,whenweleaveourdailytoilsbehindandslipintomindlessrepose.Ordowe?(46)TworeportsinScience,on
TomanypeopletheBermudaTriangleisreallyamysterybecause______.WhichofthefollowingstatementsisNOTTRUEaccording
ItisimpossibletomeasuretheimportanceofEdisonbyaddingupthespecificinventionswithwhichhisnameisassociated.Far
随机试题
患者,男孩,1岁,面色苍白2个月,生后母乳喂养至今,未规律添加辅食,平日易感冒。查体:发育营养稍差,皮肤黏膜苍白,无黄疸,浅表淋巴结不大,心前区可闻及2级收缩期杂音,肝脾无肿大。血常规Hb85g/L,RBC3.5×109/L,MCH24pg,MC
对心理实质正确全面的理解是
3个月婴儿,每日供给的热量为0.42MJ/kg(100kcal/kg),需要蛋白质、脂肪、碳水化合物分别占总热量为
《风景名胜区规划规范》规定,风景资源评价的内容应包括()。
电力设施与其他设施相互妨碍的处理,实行()原则。
用友报表系统中,如果要表示当前表的第2页,则可以表示为%2。()
我国的金融机构,按地位和功能可分为四大类:第一类,中央银行,即中国人民银行。第二类,银行,包括政策性银行、商业银行。第三类,非银行金融机构,主要包括国有及股份制的保险公司、城市信用合作社、证券公司(投资银行)、财务公司等。第四类,在境内开办的外资、侨资、中
教育“生物起源说”的代表是()
先有一个目标(目的),它与当前的状态之间存在着差异,人们认识到这个差异,就要想出某种办法采取活动(手段)来缩小这个差异。这种解决问题的方法或策略是()。
陈某因病人院经抢救无效而死亡,这在民法上属于()。
最新回复
(
0
)