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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q16-Q21):

NEW QUESTION # 16
Click the Exhibit button. You are troubleshooting an IP fabric for your data center. You notice that your traffic is not being load balancing to your spine devices from leaf devices.
Referring to the configuration shown in the exhibit, what must be configured to solve this issue?

A. The load-balance policy must be applied as an export policy to your BGP.
B. The load-balance policy must have a from statement that matches on protocol bgp.
C. The multipast multiple-as configuration must be configured for each peer in the BGP spine group.
D. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.

Answer: D

Explanation:
You already have BGP multipath turned on (multiple-as;), so the control plane can install multiple equal-cost routes to the spines.
You also created a load-balance policy (load-balance per-packet;).
But the traffic is still not being balanced → because the policy is not applied anywhere.
In Junos, per-packet (or per-flow) load-balancing is not decided in BGP.
It's decided in the forwarding table (FIB) - the place where the actual packet forwarding happens.
That's why Juniper requires you to "attach" your load-balancing policy to the forwarding table.

NEW QUESTION # 17
You are deploying an IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)

A. The oversubscription ratio decreases when you add leaf devices.
B. The oversubscription ratio increases when you remove leaf devices.
C. The oversubscription ratio remains the same when you remove leaf devices.
D. The oversubscription ratio remains the same when you add leaf devices.

Answer: B,D

Explanation:
Adding leaf devices increases the edge bandwidth (workload-facing ports), which lowers the oversubscription ratio because the amount of bandwidth facing the workloads increases relative to the fabric bandwidth.
However, the oversubscription ratio itself remains the same when you add leaf devices if the fabric design and spine capacity remain unchanged because the ratio is a function of edge bandwidth to spine bandwidth. Adding leaf devices without changing spine devices keeps the ratio at the same level.
Removing leaf devices would increase the oversubscription ratio because the amount of edge bandwidth decreases while spine bandwidth remains the same.

NEW QUESTION # 18
Which two statements are correct about an IP fabric? (Choose two.)

A. EBGP is only required to route most routing information to external devices outside the fabric.
B. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.
C. Only a single point to point EBGP session is required between peers in an IP fabric.
D. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration

Answer: B,C

Explanation:
When each device in the IP fabric has a different AS number, the BGP "multipath multiple-as" statement must be enabled to allow ECMP (Equal-Cost Multi-Path) across EBGP peers with different ASNs.
EBGP sessions in an IP fabric are established as single point-to-point sessions between directly connected devices, typically leaf-to-spine, allowing for scalable and straightforward peering.

NEW QUESTION # 19
Exhibit.

Given the configuration shown in the exhibit, why has the next hop remained the same for the EVPN routes advertised to the peer 203.0.113.2?

A. The export policy is incorrectly configured.
B. The vrf-export parameter must be applied.
C. EVPN routes cannot have the next hop changed.
D. The vpn-apply-export parameter must be applied to this peer.

Answer: D

Explanation:
* Understanding the Configuration:
* The configuration shown in the exhibit involves an EVPN (Ethernet VPN) setup using BGP as the routing protocol. The export policy named CHANGE_NH is applied to the BGP group evpn- peer, which includes a rule to change the next hop for routes that match the policy.
* Issue with Next Hop Not Changing:
* The policy CHANGE_NH is correctly configured to change the next hop to 203.0.113.10 for the matching routes. However, the next hop remains unchanged when advertising EVPN routes to the peer 203.0.113.2.
* Reason for the Issue:
* In Junos OS, when exporting routes for VPNs (including EVPN), the next-hop change defined in a policy will not take effect unless the vpn-apply-export parameter is used inthe BGP configuration. This parameter ensures that the export policy is applied specifically to VPN routes.
* The vpn-apply-export parameter must be included to apply the next-hop change to EVPN routes.
* Correct Answer Explanation:
* D. The vpn-apply-export parameter must be applied to this peer:This is the correct solution because the next hop in EVPN routes won't be altered without this parameter in the BGP configuration. It instructs the BGP process to apply the export policy to the EVPN routes.
Data Center References:
* This behavior is standard in EVPN deployments with Juniper Networks devices, where the export policies applied to VPN routes require explicit invocation using vpn-apply-export to take effect.

NEW QUESTION # 20
Exhibit.

Referring to the exhibit, why is the active source field blank for the entry that uses the 00:0c:29:e8:b7:39 MAC address?

A. This entry is associated with a multicast EVPN route.
B. The host for this entry is locally connected to leaf1.
C. The ARP lookup for this host has failed.
D. The EVPN route for this host does not have a valid next hop.

Answer: D

Explanation:
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.

NEW QUESTION # 21
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