Given the network diagram, which routers currently make up the IS - IS backbone?（） 
- A、R3,R4,R6
- B、R2,R3,R6,R7
- C、R1 through R8
- D、R3,R4,R5,R6
- E、R2,R3,R4,R6,R7
正确答案:E
答案解析:有
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Given the network diagram, which routers currently make up the IS - IS backbone?（）
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