令赛迪网北京赛迪网信息技术有限公司 Ccidwww.ccidnet.comBeijIngCcidNetInFormAtiOnTecHnolOgyColtD (34)A.NP>1 B NP<I C NP<O DNP>O (35)A.降为0 B.不断增加 C.达到1 D.不断减少 答案:BAAA DES加密算法采用的密码技术是_(36),它采用(37)位密钥对传输的数据进行加密 著名的网络安全系统 Kerberos采用的是_(38)加密技术。公钥密码是(39)_,常用的公钥加 密算法有_(40),它可以实现加密和数字签名。 (36)A.对称密钥密码技术 B公钥密码技术 C.数字签名技术 D访问控制技术 (37)A.16 B.128 C.64 D.56 (38)A. DES B RSA C Hash DIDEA (39)A.对称密钥技术,有1个密钥 B.不对称密钥技术,有2个密钥 C.对称密钥技术,有2个密钥 D不对称密钥技术,有1个密钥 (40)A. RSA B. DES C Hash D IDEA 答案: ADABA Frame Relay is simplified form of (41), similar in principle to (42), in which synchronous, frames of data are routed to different destinations depending on heade information Packets are routed throught one or more Virtual Circuits known as (43) Most Virtual Circuits are (44)which means that the network provider sets up all DLCI connections at subscription time.(45)are also part of the Frame Relay specification. They privide a link that only lasts only as long as the sessio (41)A. Datagram Switching B Datagram routing C. Packet Switching D packet Routing (42)A.X.21 B.X.25 C.X.28 D.X.29 (43)A. DLCIs B. HDLCS C SDLCS D DLS (44)A Permanent Circuit B. Permanent Virtual Circuits C. Switched Virtual Circuits D. Switching circuits (45)A Permanent Circuits B Permanent virtual Circuits C. Switched Virtual Circuits D. Switched Circuits 答案: CBABC LAPB is a(46) protocol that provides comlete data transparency in a (47)operation It supports a peer-to-peer link in that neither end of the link plays the role of the permanent master aton HDLC LAPB is the_(48) that is usually used by (49), the(50)standard for Packet (46)A. bit-oriented synchronous B. byte-oriented synchronous C. bit-oriented asynchronous D byte-oriented asynchronous (47)A. half-duplex point-to-point B half-duplex point-to-points C. full-duplex point-to-point D full-duplex point-to-points (48)A. Physical Layer B Link Layer C Network Layer D. Transport Layer（34） A. NP>1 B. NP<1 C.NP<0 D.NP>0 （35） A. 降为 0 B. 不断增加 C. 达到 1 D. 不断减少 答案：BAAA DES 加密算法采用的密码技术是_(36)_，它采用_(37)_位密钥对传输的数据进行加密， 著名的网络安全系统 Kerberos 采用的是_(38)_加密技术。公钥密码是_(39)_，常用的公钥加 密算法有_(40)_，它可以实现加密和数字签名。 （36）A. 对称密钥密码技术 B.公钥密码技术 C. 数字签名技术 D.访问控制技术 （37）A. 16 B. 128 C.64 D. 56 （38）A. DES B. RSA C.Hash D.IDEA （39） A. 对称密钥技术，有 1 个密钥 B. 不对称密钥技术，有 2 个密钥 C. 对称密钥技术，有 2 个密钥 D.不对称密钥技术，有 1 个密钥 （40）A. RSA B. DES C.Hash D. IDEA 答案：ADABA Frame Relay is simplified form of _(41)_ ,similar in principle to _(42)_, in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as _(43)_. Most Virtual Circuits are _(44)_,which means that the network provider sets up all DLCI connections at subscription time . _(45)_are also part of the Frame Relay specification . They privide a link that only lasts only as long as the session . （41）A. Datagram Switching B.Datagram Routing C. Packet Switching D. packet Routing （42）A. X . 21 B. X . 25 C. X . 28 D. X . 29 （43）A. DLCIs B.HDLCs C.SDLCs D.DLs （44） A. Permanent Circuits B. Permanent Virtual Circuits C. Switched Virtual Circuits D. Switching Circuits （45） A. Permanent Circuits B. Permanent Virtual Circuits C. Switched Virtual Circuits D. Switched Circuits 答案：CBABC LAPB is a _(46)_ protocol that provides comlete data transparency in a _(47)_ operation. It supports a peer-to-peer link in that neither end of the link plays the role of the permanent master station. HDLC LAPB is the _(48)_ that is usually used by _(49)_ ,the _(50)_standard for Packet Swihched Networks. （46）A. bit-oriented synchronous B. byte-oriented synchronous C. bit-oriented asynchronous D. byte-oriented asynchronous （47）A. half-duplex point-to-point B. half-duplex point-to-points C. full-duplex point-to-point D. full-duplex point-to-points （48）A. Physical Layer B.Link Layer C.Network Layer D.Transport Layer