Quick Answer
The answer is a routing policy with an import term, as this is the Junos feature designed to filter routes from being installed in the routing table based on specified criteria. When a routing protocol or peer advertises routes, an import policy evaluates each route against match conditions—such as prefix, community, or AS path—and applies an action like accept or reject, thereby controlling exactly which routes are added to the routing table. On the JNCIA-Junos exam, this concept tests your understanding of how Junos separates route advertisement from route acceptance; a common trap is confusing import policies (which filter routes entering the routing table) with export policies (which filter routes leaving the routing table). Remember the memory tip: “Import inspects what gets installed, export controls what gets announced.”
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 administrator wants to filter routes from being installed in the routing table based on certain criteria. Which Junos feature should be used?
Community list
Why wrong: Community lists are used in BGP policies to match communities.
Routing policy (import)
Import policies can filter routes before they enter the routing table.
Prefix list
Why wrong: A prefix list is a component of a routing policy, not a standalone feature.
Firewall filter
Why wrong: Firewall filters control packet forwarding, not route installation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Routing policy (import)
B is correct because a routing policy with an import term is the Junos mechanism to control which routes are accepted into the routing table from a routing protocol or a peer. By defining match conditions (e.g., prefix, community, AS path) and an action (accept or reject), the administrator can filter routes before they are installed. This is the standard Junos approach for route filtering at the routing table level.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Community list
Why it's wrong here
Community lists are used in BGP policies to match communities.
Routing policy (import)
Why this is correct
Import policies can filter routes before they enter the routing table.
Related concept
Read the scenario before looking for a memorised answer.
Prefix list
Why it's wrong here
A prefix list is a component of a routing policy, not a standalone feature.
Firewall filter
Why it's wrong here
Firewall filters control packet forwarding, not route installation.
Common exam traps
The trap here is confusing a match condition (like a prefix list or community list) with the actual Junos feature that applies the filter (the routing policy), leading candidates to select a component rather than the complete mechanism.
Detailed technical explanation
Under the hood, Junos routing policies are evaluated in a sequential, first-match-wins manner within a term. The import policy is applied at the point where a routing protocol (e.g., OSPF, BGP) injects routes into the routing table (RIB). A common real-world scenario is using an import policy to reject default routes from a specific BGP peer while accepting all other routes, which cannot be achieved with a simple prefix list alone.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Routing Fundamentals — This question tests Routing Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Routing policy (import) — B is correct because a routing policy with an import term is the Junos mechanism to control which routes are accepted into the routing table from a routing protocol or a peer. By defining match conditions (e.g., prefix, community, AS path) and an action (accept or reject), the administrator can filter routes before they are installed. This is the standard Junos approach for route filtering at the routing table level.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-JUNOS exam.
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