I. Multiple Choice
1.1In the following options, which does not define in protocol? ( D )
A the format of messages exchanged between two or more communicating entities B the order of messages exchanged between two or more communicating entities C the actions taken on the transmission of a message or other event D the transmission signals are digital signals or analog signals
1.2In the following options, which is defined in protocol? ( A )
A the actions taken on the transmission and/or receipt of a message or other event B the objects exchanged between communicating entities C the content in the exchanged messages D the location of the hosts
1.3 Which of the following nodes belongs to the network core? ( C )
A. a Web Server B. a Host with Win2003 Server C. a Router with NAT rvice D. a Supernode on Skype Network
91宝儿1.4 In the Internet, the equivalent concept to end systems is ( A ). A hosts B rvers C clients D routers
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1.5 In the Internet, end systems are connected together by ( C ). A copper wire B coaxial cable C communication links D fiber optics
1.6 End systems access to the Internet through its ( C ). A modems B protocols C ISP D sockets 关爱学生
1.7 In the following options, which belongs to the network core? ( B ) A end systems B routers C clients D rvers
1.8 End systems, packet switches, and other pieces of the Internet, run ( D ) that control the nding and receiving of information within the Internet. A programs B process C applications D protocols
1.9 The protocols of various layers are called ( A ). A the protocol stack B TCP/IP C ISP D network protocol
1.10 In the OSI reference model, the upper layers of the OSI model are, in correct order (D)
a) Session, application, prentation b) Session, prentation, application c) Session, application, prentation, physical d) Application, prentation, ssion
1.11 The lower layers of the OSI model are, in correct order( D )
a) physical, system, network, logical b) physical, logical, network, system c) physical, transport, network, data link d) physical, data link, network, transport
1.12 Which of the following protocol layers is not explicitly part of the Internet Protocol Stack? ___B______ A. application layer B. ssion layer C. data link layer D. transport layer 牛b的话
1.13 The 5-PDU is called__D_ A. message B. gment C. datagram D. frame
1.14 Transport-layer packets are called: B
A. message B. gment C. datagram D. frame
1.15 The units of data exchanged by a link-layer protocol are called ( A ). A Frames B Segments C Datagrams D bit streams
1.16 There are two fundamental approaches to building a network core, ( B ) and packet switching. A electrical current switching B circuit switching C data switching
D message switching
1.17 There are two class of packet-switched networks: ( B ) networks and virtualcircuit networks. A datagram 跳绳的好处和坏处
B circuit-switched C television D telephone
1.18 ( A ) means that the switch must receive the entire packet before it can begin to transmit the first bit of the packet onto the outbound link.
A Store-and-forward transmission B FDM C End-to-end connection
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1.19 In ( C ) networks, the resources needed along a path to provide for communication between the end system are rerved for the duration of the communication ssion. A p小苏打怎么用
acket-switched B data-switched C circuit-switched D message-switched
1.20 In ( A ) networks, the resources are not rerved; a ssion’s messages u the resources on demand, and as a conquence, may have to wait for access to communication link. A packet-switched B data-switched C circuit-switched D message-switched
1.21 Which of the following option belongs to the circuit-switched networks? ( D ) A FDM
B TDM C VC networks D both A and B
