问答题NSP的概念。
问答题
NSP的概念。
参考解析
解析：
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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）
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对B错