多项选择题
A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing
单项选择题 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?（）
单项选择题 With R4.0, how many total DCC tunnel connections can each ONS 15454 support using the TCC+ card?（）
多项选择题 Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected UPSR ring. In the exhibit, which two must you configure?（） (Choose two.)