[单项选择]The network layer provides services to the transport layer．It can be based on either (71) ．In both cases，its main job is (72) packets from the source to the destination．
In network layer，subnets can easily become congested，increasing the delay and (73) .
for packets．Network designers attempt to avoid congestion by proper design．Techniques include (74) policy，caching，flowcontrol，and more．
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，traffic shaping，resource (75) ，and admission control．Approaches that have been designed for good quality of service include integrated services(including RSVP) ，differentiated services， and MPLS．

A. virtual circuits or datagrams
B. TCP or UDP
C. TCP or IP
D. IP or ARP

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[单项选择]The network layer provides services to the transport layer. It can be based on either (71) . In both cases, its mainjob is (72) packets from the source to the destination.
In network layer, subnets can easily become congested, increasing the delay and (73) for packets. Network designers attempt to avoid congestion by proper design. Techniques include (74) policy, caching, flow control, and more.
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client, trafficshaping, resource (75) , and admission control. Approaches that have been designed forgood quality of service include integrated services (including RSVP), differentiated services, andMPLS.

A. TCP or UDP
B. packets or segments
C. virtual circuits or datagrams
D. IP or IPX

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[简答题]This company provides services for any breakdown free of charge within one year of purchase. If damage results from improper use, maintenance flat cost is charged. If it is a product quality problem, this company carries warranties of maintenance, replacement and return of product. Maintenance services are detailed on "warranty card."

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[多项选择]When the freight forwarder provides services on behalf of the exporter, he would study the provisions of the L/C and all Government regulations applicable to the shipment of goods in the ( ).
A. country of export
B. country of import
C. transit country
D. all countries

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[单项选择]TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines (73) that applications need-like the ability to transfer a file in the case of HTTP. In short，the application layer provides an (74) between software running on a computer and the network itself．The TCP/IP application layer includes a relatively large number of protocols，with HTTP being only one of those．The TCP/IP (75) layer consists of two main protocol options-the Transmission Control Protocol(TCP)And the User Datagram Protocol(UDP)．

A. services
B. processes
C. applications
D. address

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