单项选择题

Why does IS-IS use the SPF algorithm?（）

A. to determine the pseudonode ID
B. to determine the next hop to a given destination
C. to determine the complete path to a given destination
D. to determine the number of routers present in a given area

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Which BGP attribute is considered first as a tie-breaker in JUNOS software?（）

A. origin
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Given the regular expression: 64900 . (65400-65410) Which AS Path matches the given regularexpression?（）

A. 64900 65000 65500
B. 64900 65402 65409
C. 64900 65000 65300 65410
D. 64900 65402 65405 65409

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Which two are valid fields in an IPv6 header?（）

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