单选题By default, an L1/L2 IS-IS router advertises what remote area routes into a Level 1 area?（）Aonly summarized routesBall routes in the networkCall routes in the backboneDNo routes are advertised.
单选题
By default, an L1/L2 IS-IS router advertises what remote area routes into a Level 1 area?（）
A
only summarized routes
B
all routes in the network
C
all routes in the backbone
D
No routes are advertised.
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