Exam 300-320 topic 1 question 145 discussion

A and E for me core to distribution

AE is correct https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.html

The only way HSRP is the correct answer is if the chassis are connected via vPC. https://www.ciscozine.com/nexus-vpc-hsrp-vrrp-active-active/ Another very confusing question by Cisco....

HSRP ist not Active/active. Only reasonable answers are A and E

I also think that the correct answers should be A and E. First of all HSRP is not active/active. Besides, it is used in access-distribution module not core-distribution.

I think HSRP cannot be a part of correct answer... In most of tier3 designs connection between distribution and core is on L3. So ECMP will allow to utilise all links and all devices. Additionally if we will use VSS then mEtherChannel will be the best solution as we are connecting each of Distribution routers to each Core but from Distribution point of view Core is a one device. Additionally HSRP is a Active/Standby solution.

I will take that back. It is indeed C) Hot Standby Routing Protocol (HSRP) E) Multichassis EtherChannel (MEC) according to the following cisco's forum discussion https://community.cisco.com/t5/switching/active-active-high-availability/td-p/2003800

A) Equal Cost Multi-Path (ECMP) E) Multichassis EtherChannel (MEC) in my humble opinion.

Not sure why answer A is deemed incorrect. Wouldn't having multiple routed paths between the distribution & core devices allow traffic to continue flowing if one of the links goes down?