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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
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Read about HSRP Gratuitous ARP
B is correct
(2) The answer to this can be "Neighboring interfaces with MTU mismatch"; i.e to change MTU value of one router to be different that the one which belongs to the other router. But as this option is not there, and I rejected D based on above (B and C, process ID and priority are irrelevant and are also rejected). This leaves for us A; i.e. to modify hello interval. However, before we discuss the impact of this, please read the question again to find that whatever we do, we need to act the status quo in which the two routers even have no intent to become neighbors, they send hello's but each one find a different hello timers in the hello messages and therefore refuse to proceed more. Hence, whatever other option we chose (e.g. D or if MTU is there), we have to first fix Timers (combined with the other option of your choice). Hence, I believe the answer given is the one that is on the mind of the examiner who designed this question.