● 802.3标准中使用的媒体访问控制方式是____(61)____。
　　（61）A．Token Ring　　B．Token Bus　　　C．CSMA/CD　　D．ALOHA

　　● TCP/IP协议分为四层，分别为应用层、传输层、网际层和网络接口层。不属于应用层协议的是____(62)_____，属于网际层协议的是____(63)_____。
　　（62）A．SNMP　　　　　B．UDP　　　　　　C．TELNET　　 D．FTP
　　（63）A．RPC　　　　　 B．UDP　　　　　　C．TCP　　　　D．IP

　　● 一个局域网中某台主机的IP 地址为176.68.160.12，使用22 位作为网络地址，那么该局域网的子网掩码为_____(64)____，最多可以连接的主机数为____(65)_____。
　　（64) A．255.255.255.0　　　　　　　　　　B．255.255.248.0
　　　　　C．255.255.252.0　　　　　　　　　　D．255.255.0.0
　　（65) A．254　　　　　　B．512　　　　　　C．1022　　　　　　D．1024

　　● 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 documents　(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 incorporated 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 Love Letter 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 victim's address book, previous emails, web pages__(73)___.
　　As administrators seek to block 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