D.
By default, spine and leaf devices in an EVPN network implement the core isolation feature. If one of these devices loses all of its EVPN BGP peering sessions, the core isolation feature, working in conjunction with Link Aggregation Control Protocol (LACP), automatically brings down all Layer 2 Ethernet Segment Identifier (ESI) link aggregation group (LAG) interfaces on the device.
D is correct I think. It looks like the answers are not well formulated. Answer "C" says it puts interfaces in passive mode, and this is not true. Juniper documentation says it puts interfaces in stand-by mode.
It is C:
-> the core isolation feature, working in conjunction with Link Aggregation Control Protocol (LACP), automatically brings down all Layer 2 Ethernet Segment Identifier (ESI) link aggregation group (LAG) interfaces on the device.
A is wrong, a pause frame is send when congestion occurs - in our case the ports need to be shut down.
th the core isolation feature enabled by default, LACP sets the server-facing interface on Leaf 1 to standby mode, which blocks all traffic from the server. In this situation, the default implementation of the core isolation feature provides the following benefits:
https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/evpn-vxlan-core-isolation-disabling.html
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