How often are IS-IS Hello packets transmitted?() A. 3 seconds for DIS; 9 seconds for non-DISB. 9 seconds for DIS; 3 seconds for non-DISC. 10 seconds for DIS; 3 seconds for non-DISD. 10 seconds for all routers
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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