Exam 200-301 topic 1 question 371 discussion

This virtual IP address is in the same subnet as the interface IP address, but it is a different IP address. The router then automatically creates the virtual MAC address. All the cooperating HSRP routers know these virtual addresses, but only the HSRP active router uses these addresses at any one point in time. The virtual router is responsible for host communications such as an ARP request for the host’s default gateway. Technically, this is served by the active router since it is hosting the virtual router. However, it is the virtual router’s IP address and MAC address that are used for outgoing packets.

B is correct

Read about HSRP Gratuitous ARP

Answer B is correct

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.