Protects signals when a ring switch fails
Protects signals when multiple span switches fail
Protects pre-emptible traffic from being dropped when a ring switch occurs
Protects signals against any combination of link failure in each ring
第1题：
A. It protects signals against node failures between rings.
B. It protects signals against node failure within a single ring.
C. It allows for traffic to be preempted when a ring switch occurs.
D. Traffic can be dropped and continued at interconnecting nodes.
E. It protects preemptible traffic from being dropped when a ring switch occurs.
第2题：
What was the purpose of Goldman’s invention? (No more than 10 words)
It was to make shopping easier and attract more business.
第3题：
What’s the author’s purpose of writing this test?
A. To suggest ways to prepare for college learning
B. To help readers find the right college
C. To make Johnson Review popular
D. To introduce college life
第4题：
In Hammer’s five-step model, the purpose of “elicitation” is to provide the teacher with feed back as to what to do next.（）
第5题：
第6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?（）
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
第7题：
第8题：
A、Uh, I’m not sure.
B、I’m intending to ask for your advice on brand design.
C、Yes, I’d like to talk with you.
第9题：
In Hammer’s five-step model, the purpose of “elicitation” is to provide the teacher with feed back as to what to do next.（）
A对
B错
第10题：
What is the purpose of an administrative distance？