题目内容
（请给出正确答案）
OSI(Open System Interconnection)安全体系方案X.800将安全服务定义为通信开放系统协议层提供的服务，用来保证系统或数据传输有足够的安全性。X.800定义了5类可选的安全服务。下列相关的选项中不属于这5类安全服务的是______。
A．数据保密性
B．访问控制
C．认证
D．数据压缩
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更多“OSI（Open System Interconnectio…”相关的问题
OSI(Open System Interconnection)安全体系方案X.800将安全性攻击分为两类，即被动攻击和主动攻击。主动攻击包括篡改数据流或伪造数据流，这种攻击试图改变系统资源或影响系统运行。下列攻击方式中不属于主动攻击的是______。
A．伪装
B．消息泄漏
C．重放
D．拒绝服务
TCP functions at the Open System Interconnection(OSI)(61)layer, or Layer 4. Its chief responsibility is to ensure(62)end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each(63)sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3(64). This information, combined with routing tables and other network intelligence, is all it takes to get(65)the room or around the world via TCP/IP.
A．transpose
B．translate
C．transmit
D．transport
The Internet is a () system of interconnected computer networks that use the standard Internet protocol suits(TCP/IP) to serve several billion users worldwide。
A．global B．regional C．local D．national
A.Organization for Standards Institute
B.Organization for Internet Standards
C.Open Standards Institute
D.Open Systems Interconnection
A．Web pages
B．modem
C．security
D．network
Which is the second layer from the bottom in Open System Interconnection Reference Model？ （71）．
A.Application
B.Data link
C.Network
D.Session
Open Shortest Path First (OSPF)is a(66)routing algorithm that(67)work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires(68)processing power. The(69)algorithm is used to calculate routes. OSPF routing table updates only take place when necessary,(70)at regular intervals.
A．distance-vector
B．link-state
C．flow-based
D．selective flooding
(74)
A. Web pages
B. modem
C. security
D. network
