Juniper JN0-683 Exam Questions - Navigate Your Path to Success

Correct : A

In this scenario, you want the border leaf device to advertise Type 5 EVPN routes to another border leaf in a different data center. Type 5 routes in EVPN are used to advertise IP prefixes, which means that for proper route advertisement, you need to configure the correct settings within the evpn hierarchy.

Step-by-Step Analysis:

Understanding EVPN Type 5 Routes:

EVPN Type 5 routes are used to advertise IP prefixes across EVPN instances, which allow different data centers or networks to exchange routing information effectively.

VRF Target Setting:

The vrf-target configuration is crucial because it defines the export and import policies for the VRF within the EVPN instance. For EVPN Type 5 routes to be advertised to other border leaf devices, the vrf-target needs to be correctly configured under the evpn hierarchy, not just within the routing instance.

Command to solve this:

move vrf-target target:65000:1 to evpn

Other Options:

Option B: Adding a VLAN configuration would not address the requirement to advertise Type 5 routes.

Option C: Adding VXLAN encapsulation may be necessary for other scenarios but does not directly address the Type 5 route advertisement.

Option D: Changing the route-distinguisher will differentiate routes but does not impact the advertisement of Type 5 routes to other data centers.

By moving the vrf-target to the evpn hierarchy, you enable the proper route advertisement, ensuring that the Type 5 routes for local networks are shared with other data center border leaf devices. This is aligned with best practices for multi-data center EVPN implementations, which emphasize the correct placement of routing policies within the EVPN configuration.

Correct : A

In this scenario, the active source field is blank for the MAC address 00:0c:29:e8:b7:39, indicating an issue with how this MAC entry is being processed within the EVPN/VXLAN environment.

Step-by-Step Analysis:

Understanding the MAC Entry:

The active source field should normally indicate the source of the route advertisement for a specific MAC address within the EVPN. If it is blank, it suggests that there is a problem with how this entry is being learned or propagated.

Possible Issues:

Option A: If the EVPN route for this MAC address does not have a valid next hop, the entry might exist in the MAC table, but it will not have a valid path for forwarding, leading to a blank active source.

Option B: If the ARP lookup had failed, the entry might not even appear in the MAC table. However, the entry does exist, suggesting that ARP is not the primary issue here.

Option C: If the host were locally connected, the active source should reflect a local interface, but the field is blank, ruling out local connection as the cause.

Option D: Multicast EVPN routes typically do not appear in this manner in the MAC table, and this would not cause the active source to be blank.

Conclusion: The most logical explanation is that the EVPN route for this host exists but does not have a valid next hop, leading to the absence of an active source. This is consistent with how EVPN routing tables work in a VXLAN environment, where the lack of a valid next hop would prevent proper route advertisement and forwarding for the specific MAC address.