The answer is that the route is locally originated and has no MPLS label. This is correct because the output of the **show bgp vpnv4 vrf** command for prefix 10.1.1.0/24 in VRF CUSTOMER-A shows a next hop of 0.0.0.0, which indicates the route was injected locally (e.g., via a connected network or a static route redistributed into BGP), and the "mpls labels in/out nolabel/nolabel" field confirms that no MPLS label has been assigned to this prefix. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret VPNv4 BGP table output and identify when a route is missing its MPLS label—a common troubleshooting point in MPLS L3VPN deployments. A frequent trap is assuming that any route in the VPNv4 table automatically has a label; however, locally originated routes often lack one unless explicitly configured with label allocation. Remember the memory tip: "Local next hop, no label drop"—if the next hop is 0.0.0.0, expect nolabel.
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to troubleshoot an MPLS L3VPN issue:
R1# show bgp vpnv4 vrf CUSTOMER-A 10.1.1.0/24
Output:
BGP routing table entry for 10.1.1.0/24, version 10
Paths: (1 available, best #1, table CUSTOMER-A)
Advertised to update-groups:
1
Refresh Epoch 1
Local
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The route is locally originated and has no MPLS label
This shows a VPNv4 route for prefix 10.1.1.0/24 in VRF CUSTOMER-A. The path is local (sourced from this router), with next hop 0.0.0.0, and the route is valid and best. The extended community is RT:100:100. The mpls labels show nolabel/nolabel, meaning no MPLS label is assigned for this prefix, which could indicate a problem if labels are expected.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The route is locally originated and has no MPLS label
Why this is correct
The route is sourced locally (0.0.0.0 from 0.0.0.0) and the mpls labels are nolabel/nolabel.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The route is learned from a BGP peer
Why it's wrong here
The next hop is 0.0.0.0, indicating local origin, not from a peer.
✗
The route has an MPLS label of 100
Why it's wrong here
The extended community RT:100:100 is not an MPLS label; labels are nolabel.
✗
The route is not best
Why it's wrong here
The output explicitly states 'best'.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
The output explicitly states 'best'.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
MPLS L3VPN — This question tests MPLS L3VPN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The route is locally originated and has no MPLS label — This shows a VPNv4 route for prefix 10.1.1.0/24 in VRF CUSTOMER-A. The path is local (sourced from this router), with next hop 0.0.0.0, and the route is valid and best. The extended community is RT:100:100. The mpls labels show nolabel/nolabel, meaning no MPLS label is assigned for this prefix, which could indicate a problem if labels are expected.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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