This 350-501 practice question tests your understanding of services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
Refer to the exhibit.
PE1# show ip bgp vpnv4 vrf Customer-B 192.168.10.0
BGP routing table entry for 192.168.10.0/24, version 12
Paths: (1 available, best #1, table Customer-B)
Not advertised to any peer
Refresh Epoch 1
Local, imported path from 10.1.1.2 (via vrf Customer-B)
RD: 65000:100
Origin IGP, metric 0, localpref 100, valid, internal, best
Extended Community: RT:65000:200
Originator: 10.1.1.2, Cluster list: 10.2.2.2
mpls labels in/out: 16023/16030
Given the output, which configuration mismatch would prevent a remote PE in the same VPN from installing this route into its VRF?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The remote PE has an import RT that does not include RT:65000:200.
The route carries RT:65000:200. A remote PE must have a VRF with an import RT that matches this RT to install the route. If the remote PE's VRF imports RT:65000:100 instead, the route will not be installed. Option A is incorrect because different RDs do not prevent route installation as long as the RT matches. Option B is incorrect because the next-hop is reachable (10.1.1.2) via the global table. Option D is incorrect because MPLS VPN does not use AS-path filtering by default.
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 remote PE has an import RT that does not include RT:65000:200.
Why this is correct
Correct: The route's RT must match an import RT on the remote VRF for the route to be installed.
Related concept
Static NAT maps one inside address to one outside address.
✗
The remote PE uses a different route distinguisher for its VRF.
Why it's wrong here
Incorrect: Different RDs do not block route import; RT matching is what controls import.
✗
The remote PE filters routes based on BGP AS-path containing AS 65000.
Why it's wrong here
Incorrect: AS-path filtering is not typical in MPLS VPN; RT import is the standard mechanism.
✗
The next-hop 10.1.1.2 is not reachable in the remote PE's global routing table.
Why it's wrong here
Incorrect: A missing next-hop would affect BGP path selection, but the route would still be learned; the issue is with RT import.
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.
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.
What to study next
Got this wrong? Here's your next step.
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 350-501 NAT questions on configuration and troubleshooting.
Services — This question tests Services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The remote PE has an import RT that does not include RT:65000:200. — The route carries RT:65000:200. A remote PE must have a VRF with an import RT that matches this RT to install the route. If the remote PE's VRF imports RT:65000:100 instead, the route will not be installed. Option A is incorrect because different RDs do not prevent route installation as long as the RT matches. Option B is incorrect because the next-hop is reachable (10.1.1.2) via the global table. Option D is incorrect because MPLS VPN does not use AS-path filtering by default.
What should I do if I get this 350-501 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 350-501 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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