2009年5月全国计算机软考网络工程师练习(19)

 　●(1)In the strength of the carrier signal is varied to represent binary1 or 0．
　　(2)is a system that can map a name to an address and conversely an addressto an name．
　　(3)is a three-way handshaking authentication protocol that it's packets areencapsulated inthe point-to-point protocol
　　(4)is an approach that enables an ATM Switch to behave like a LAN switch．
　　(5)is an guided media which is made of glass or plastic and trans mitssignals in the form of light．
　　(1)A．ASK
　　B．PSK
　　C．FSK
　　D．FDM
　　(2)A．NAT
　　B．NCP
　　C．DDN
　　D．DNS
　　(3)A．PPP
　　B．PAP
　　C．CHAP
　　D．LCP
　　(4)A．VLAN
　　B．LANE
　　C．VPN
　　D．IPOA
　　(5)A．Coaxial cable
　　B．Optical fiber
　　C．Unshielded Twisted-pair Cable
　　D．Shielded Twisted-pair Cable