Question 268 of 500
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350-501 Networking Practice Question

This 350-501 practice question tests your understanding of networking. 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.

An engineer is configuring an MPLS L3VPN and needs to ensure that the PE router installs VPNv4 routes from a remote PE into the VRF of a customer. The remote PE sends a VPNv4 route with route-target 100:1. Which configuration on the local PE causes the route to be imported into the VRF?

Question 1hardmultiple choice
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Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

vrf definition CUSTOMER rd 100:1 route-target import 100:1

Option C is correct because the `route-target import 100:1` command under the VRF definition configures the local PE to accept VPNv4 routes that carry the specified route-target (100:1) from the remote PE. This import RT must match the export RT of the remote PE for the route to be installed into the VRF's routing table. The `rd 100:1` defines the route distinguisher, which is separate from the RT and ensures uniqueness of the VPNv4 prefix.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • router bgp 100 address-family ipv4 vrf CUSTOMER route-target import 100:1

    Why it's wrong here

    The route-target import is configured under the VRF, not under BGP address-family.

  • vrf definition CUSTOMER rd 100:1 route-target both 100:1 route-map IMPORT

    Why it's wrong here

    Route-map is not used with route-target import; it's used for filtering.

  • vrf definition CUSTOMER rd 100:1 route-target import 100:1

    Why this is correct

    This imports routes with RT 100:1 into the VRF.

    Related concept

    Read the scenario before looking for a memorised answer.

  • vrf definition CUSTOMER rd 100:1 route-target export 100:1

    Why it's wrong here

    Export is for advertising routes, not importing.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between `route-target import` and `route-target export`, and the trap here is that candidates may select the export-only option (D) or misplace the RT command under BGP (A), failing to recognize that import must be explicitly configured under the VRF definition to receive routes from a remote PE.

Detailed technical explanation

How to think about this question

Under the hood, the route-target (RT) extended community is carried in BGP VPNv4 updates as an attribute (per RFC 4364). The import RT on the receiving PE acts as a filter: only routes whose RT matches the configured import RT are installed into the corresponding VRF. The route distinguisher (RD) ensures that overlapping customer prefixes remain unique in the MPLS core, but the RT controls route distribution between VRFs. In real-world deployments, a common mistake is confusing RD with RT, but they serve distinct purposes — RD for uniqueness, RT for import/export policy.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

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FAQ

Questions learners often ask

What does this 350-501 question test?

Networking — This question tests Networking — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: vrf definition CUSTOMER rd 100:1 route-target import 100:1 — Option C is correct because the `route-target import 100:1` command under the VRF definition configures the local PE to accept VPNv4 routes that carry the specified route-target (100:1) from the remote PE. This import RT must match the export RT of the remote PE for the route to be installed into the VRF's routing table. The `rd 100:1` defines the route distinguisher, which is separate from the RT and ensures uniqueness of the VPNv4 prefix.

What should I do if I get this 350-501 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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