第65題： 隨著數(shù)據(jù)庫所處的環(huán)境日益開放，所面臨的安全威脅也日益增多，其中攻擊者假冒用戶身份獲取數(shù)據(jù)庫系統(tǒng)訪問權(quán)限的威脅屬于( )。
A．旁路控制
B．隱蔽信道
C．口令破解
D．偽裝
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第66題： 多數(shù)數(shù)據(jù)庫系統(tǒng)有公開的默認賬號和默認密碼，系統(tǒng)密碼有些就存儲在操作系統(tǒng)中的普通文本文件中，如: Oracle 數(shù)據(jù)庫的內(nèi)部密碼就存儲在( )文件中。
A．listener.ora
B．strXXX.cmd
C．key.ora
D．paswrD.cmd
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第67題： 數(shù)據(jù)庫系統(tǒng)是一個復雜性高的基礎(chǔ)性軟件，其安全機制主要有標識與鑒別、訪問控制、安全審計、數(shù)據(jù)加密、安全加固、安全管理等，其中( )可以實現(xiàn)安全角色配置、安全功能管理
A．訪問控制
B．安全審計
C．安全加固
D．安全管理
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第69題： 以下不屬于網(wǎng)絡(luò)設(shè)備提供的 SNMP 訪問控制措施的是( )。
A．SNMP權(quán)限分級機制
B．限制 SNMP 訪問的IP 地址
C．SNMP 訪問認證
D．關(guān)閉 SNMP 訪問
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第70題： 網(wǎng)絡(luò)設(shè)備的常見漏洞包括拒絕服務(wù)漏洞、旁路、代碼執(zhí)行、溢出、內(nèi)存破壞等。CVE-2000-0945漏洞顯示思科 Catalyst 3500 XL 交換機的Web 配置接口允許遠程攻擊者不需要認證就執(zhí)行命令，該漏洞屬于( )。
A．拒絕服務(wù)漏洞
B．旁路
C．代碼執(zhí)行
D．內(nèi)存破壞
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第71題： Perhaps the most obvious difference between private-key andpublic-key encryption is that the former assumes complete secrecyof all cryptographic keys, whereas the latter requires secrecy foronly the private key.Although this may seem like a minor distinction ,the ramifications are huge: in the private-key setting thecommunicating parties must somehow be able to share the (71) keywithout allowing any third party to learn it, whereas in the public-key setting the (72) key can be sent from one party to the other overa public channel without compromising security.For partiesshouting across a room or, more realistically , communicating overa public network like a phone line or the nternet, public-keyencryption is the only option.
Another important distinction is that private-key encryption schemesuse the (73) key for both encryption and decryption, whereas publickey encryption schemes use (74) keys for each operation.That is public-key encryption is inherently asymmetri C．This asymmetry in thepublic-key setting means that the roles of sender and receiver are notinterchangeable as they are in the private-key setting; a single key-pair allows communication in one direction only.(Bidirectionalcommunication can be achieved in a number of ways; the point is thata single invocation of a public-key encryption scheme forces adistinction between one user who acts as a receiver and other userswho act as senders.)ln addition, a single instance of a (75) encryptionscheme enables multiple senders to communicate privately with asingle receiver,in contrast to the private-key case where a secret keyshared between two parties enables private communication onlybetween those two parties.
(1) A．main
B．same
C．public
D．secret
(2) A．stream
B．different
C．public
D．secret
(3) A．different
B．same
C．public
D．private
(4) A．different
B．same
C．public
D．private
(5) A．private-key
B．public-key
C．stream
D．Hash
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