单选题How often are IS-IS Hello packets transmitted?（）A3 seconds for DIS; 9 seconds for non-DISB9 seconds for DIS; 3 seconds for non-DISC10 seconds for DIS; 3 seconds for non-DISD10 seconds for all routers
单选题
How often are IS-IS Hello packets transmitted?（）
A
3 seconds for DIS; 9 seconds for non-DIS
B
9 seconds for DIS; 3 seconds for non-DIS
C
10 seconds for DIS; 3 seconds for non-DIS
D
10 seconds for all routers
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