JN0-649: Enterprise Routing and Switching, Professional (JNCIP-ENT)

MST region membership requires switches to use the same MST configuration name, revision number, and MSTI-to-VLAN mapping. These values form the MST configuration identifier used to determine whether switches belong to the same region.

The sustain server-fail fallback action preserves LAN access for end devices that were already authenticated when RADIUS becomes unavailable during reauthentication, while denying unauthenticated devices.

EVPN Type 3 Inclusive Multicast Ethernet Tag routes advertise the information needed for broadcast, unknown-unicast, and multicast replication. EVPN Type 2 MAC/IP Advertisement routes distribute endpoint MAC addresses and associated IP addresses. Type 1 is an Ethernet Auto-Discovery route, and Type 5 is an IP Prefix route.

Junos default scheduling reserves output-link bandwidth and buffer space only for best-effort and network-control traffic; the expedited-forwarding queue has no reserved resources by default. A scheduler, mapped to the expedited-forwarding forwarding class and applied to the interface, allocates the required bandwidth and queue resources for VoIP traffic.

An input Ethernet-switching firewall filter on ge-0/0/3 can match each host’s source MAC or IP address as frames enter the EX4600 and assign the corresponding VLAN. Because the intermediate switch is unmanaged, it does not provide VLAN tags that would distinguish the hosts on the shared uplink; classification must occur at ingress on the EX switch. Juniper documents source MAC and source IP address as EX Series firewall-filter match conditions and supports a VLAN action for ingress VLAN filtering.