一個局域網(wǎng)中某臺主機的IP地址為176.68.160.12，使用22位作為網(wǎng)絡地址，那么該局域網(wǎng)的子網(wǎng)掩碼為__(61)___，最多可以連接的主機數(shù)為____(62)_____。

　　(61) A.255.255.255.0 B.255.255.248.0

　　C.255.255.252.0 D.255.255.0.0

　　(62) A.254 B.512

　　C.1022 D.1024

　　以下選項中，可以用于Internet信息服務器遠程管理的是 ____(63)____。

　　(63) A.Telnet B.RAS C.FTP D.SMTP

　　在TCP/IP網(wǎng)絡中，為各種公共服務保留的端口號范圍是__(64)____。

　　(64) A.1～255 B.1～1023 C.1～1024 D.1～65535

　　在以下網(wǎng)絡應用中，要求帶寬最高的應用是___(65)___。

　　(65) A.可視電話 B.數(shù)字電視 C.撥號上網(wǎng) D.收發(fā)郵件

　　DOM is a platform-and language-____(66)___API that allows programs and scripts to dynamically access and update the content, structure and style of WWW docements (currently,definitions for HTML and XML documents are part of the specification).The document can be further processed and the results of that processing can be incprporated back into the presented ___(67)____.DOM is a ___(68)___-based API to documents ,which requires the whole document to be represented in ____(69)___while processing it .A simpler alternative to DOM is the event –based SAX,which can be used to process very large ___(70)___documents that do not fit info the memory available for processing.

　　(66)A.specific B.neutral C.contained D.related

　　(67)A.text B.image　C.page D.graphic

　　(68)A.table B.tree C.control D.event

　　(69)A.document B.processor C.disc D.memory

　　(70)A.XML B.HTML C.script D.web

　　Melissa and LoveLetter made use of the trust that exists between friends or colleagues.Imagine receiving an __(71)___from a friend who asks you to open it.This is what happens with Melissa and several other similar email __(72)___.Upon running ,such worms usually proceed to send themselves out to email addresses from the vicitm’s address book,previous emails,web pages__(73)___.

　　As administrators seek to bolock dangerous email attachments through the

　　recognition of well-known ___(74)____,virus writers use other extensions to circumvent such protection.Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.

　　Frequently ,hackers try to penetrate networks by sending an attachment that

　　looks like a flash movie ,which,while displaying some cute animation ,simultaneously runs commands in the background to steal your passwords and give the __(75)__access to your network.

　　(71)A.attachment B.packet C.datagram D.message

　　(72)A.virtual B.virus C.worms D.bacteria

　　(73)A.memory B.caches C.ports D.registers

　　(74)A.names B.cookies C.software D.extensions

　　(75)A.cracker B.user C.customer D.client

　　答案：

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