第4套 LAPB is a (1) protocol that provides complete data transparency in a (2)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 (3)that is usually used by(4), the (5)standard for Packet Switched Networks. (1)A.bit-oriented synchronous B.byte-oriented synchronous C.bit-oriented asynchronous D.byte-oriented asynchronous (2)A.half-duplex point-to-point B.half-duplex point-to-points C.full-duplex point-to-point D.full-duplex point-to-points (3)A.Physical Layer B.Link Layer C.Network Layer D.Transport Layer (4)A.X.21 B.X.25 C.X.28 D.X.29 (5)A.ITU B.IEEE C.OSI D.ANSI 答案:1:A,2:C,3:B,4:B,5:A
下一篇:软件水平考试网络工程师英语复习练习题3套
第3套 (1)is used to ensure the confidentiality,integrity and authenticity of the two end points in the private network .the(2),an application layer protocol,authenticates each peer in an IPsec transaction ,IKE negotiates security policy,determining which algorithm may ...[ 查看详情] |