Click the Exhibit button. A customer has several interconnected core rings (see exhibit). They want to create several irtual rings?utilizing their OC-192 backbone (nodes 1,2,3,4). What should you recommend?（） 
- A、PPMN with BLSR rings
- B、PPMN with UPSR rings
- C、1:N protection on all core circuits
- D、multi-ring interconnect with BLSR rings
正确答案:B
答案解析:有
微信扫一扫手机做题