There can be up to 8 Routers as One and Only One Active and 7 Standby as maximum. Thus A: Exactly one active router, correct. B: one or more standby routers, correct. D cant be correct because it specifies that one and only one standby router this can be correct only if it is the active router.
I also thought there should be only one Active router and only one standby router and the rest will remain in the listening state. However, as per the following lines, it seems we can have more than one router in a standby state:
HSRP uses an active/standby model in which one router actively assumes the role of the default gateway for devices on the subnet. One or more routers on the same subnet are then in standby mode
I also choose A and B.
HSRP group allows a single Active router.
HSRP group allows a single Standby router, the rest of them will be in the "Listening" state.
I think answer D is the closest one but it has "Standby active" in it, and I'll take that as a typo.
A and B are correct. The below reference shows why D must be wrong:
"HSRP allows you to configure two or more routers as standby routers and only a single router as an active router at a time. All the routers in a single HSRP group shares a single MAC address and IP address, which acts as a default gateway to the local network."
https://www.geeksforgeeks.org/hot-standby-router-protocol-hsrp/#:~:text=HSRP%20allows%20you%20to%20configure,gateway%20to%20the%20local%20network.
I belive it's just necessary have one active router and one standby router in the same domain collition, if other router is in the same domain collition, it take the rol of "listen"
I believe A is correct but B is not. From my understanding, HSRP can not have more than one router as standby. Any other routers will be in init state but not standby state. Not like VRRP where it doesn't matter how many router you have, you can have 1 master and all other routers become backup routers. With that being said, I believe the closest answer wil be D. Please correct me if I'm wrong.
You make a good point, I don't think the answer is D though as there is no such thing as an 'active standby' router in HSRP.
I think the way to think of this question is not in the actual HSRP operation in which it would elect one Active and one Standby router, but to think of the HSRP group like the question asks. If you are setting up a group, you would have one router that you configure to become the active router, and one or more routers for standby use.
They are not all standby in operation, but the intended purpose is standby when you are configuring the group.
an HSRP group don't really need one standby router
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