单项选择题
A. LO-PATH circuits
B. HO-PATH circuits
C. 1：1 protection circuits
D. 1：N protection circuits
E. LO-PATH tunnel circuits
单项选择题 Click the Exhibit button. As shown in the exhibit， a customer has several interconnected core rings. They want to create several irtual rings？utilizing their STM-64 backbone （nodes 1， 2， 3， and 4）. What do you recommend？ （）
单项选择题 A customer has 2 E1s to add between far-end nodes in an SNCP ring. What type of circuit should you recommend？ （）
单项选择题 WhatisthecorrectrelativeswitchingpriorityinanMS-SPRingring（highertolower）？（）