单项选择题
You are provisioning a DS-1 circuit on an ONS 15454 UPSR configuration and XC-10G card. How many total VT ports are used within the VT matrix at the source node?（）
A.0 B.1 C.2 D.3 E.4
单项选择题 What is the correct relative switching priority in a BLSR ring (higher to lower)?（）
单项选择题 Why is an OC-3 2F-BLSR not feasible?（）
多项选择题 What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)
