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单选题
NSP是指（）
A
基础网络运营商
B
应用服务提供商
C
Internet服务提供商
D
Internet内容提供商
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Which four of these key points should be considered during implementation of PPPoA architecture？（）A、the number of subscribers that will be serviced currently and in the future because this affects the number of required PPPoA sessionsB、The types of applications that the NSP offers to the end subscriberC、The capacity of ATM and Frame Relay interworking on the NSPD、in the case of more than one user， whether all users need to reach the same final destination orservice，or they all have different service destinationsE、Whether the service provider or the final service destination is providing the IP address to the CPE of the subscriber
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单选题对所要建立的电子商务网站从业务定位来讲，应该属于内容服务提供商和（）。A
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多选题Which are three advantages of PPPoA implementation？ （）ANAP and NSP provide secure access to corporate gateways without managing end-to-end PVCs.NAP and NSP use Layer 3 routing，Layer 2 Forwarding，or Layer 2 Tunneling Protocol tunnels.Hence，they can scale their business models for selling wholesale serviceBThe NSP can oversubscribe by deploying idle and session timeouts using an industry standard RADIUS server for each subscriberCOnly a single session per CPE on one virtual channel （VC).The username and password are configured on the CPE， so all users behind the CPE for that particular VC can access only one set ofservices. Users cannot select different sets of services， although using multiple VCs and establishing different PPP session on different VCs is possibleDIf a single IP address is provided to the CPE， and NAT or PAT is implemented，certain applications such as IPTV，which embed IP information in the payload， well not work. Additionally，if an IP subnet feature is used，an IP address also has to be reserved for the CPEEPPPoA can use the features on the Cisco Service Selection Gateway （SSG）
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判断题对口蹄疫疫苗多次重复免疫的动物进行非结构蛋白(NSP)抗体检测，出现阳性反应很可能是由于疫苗的纯度问题；由于疫苗制备时痕量NSP的存在，可导致阳性反应。A
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