JNCIA-SEC Srx Series Service Gateways Practice Question
An administrator needs to configure a redundant interface on an SRX Series device to combine two physical interfaces into a single logical interface for high availability and link resiliency. Which interface type should be configured?
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
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ae
In Junos OS, aggregated Ethernet interfaces are designated with the prefix 'ae' (e.g., ae0, ae1), allowing multiple physical ports to be bundled together.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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fxp0
Why it's wrong here
fxp0 is the dedicated out-of-band management Ethernet interface on supported Routing Engines.
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ae
Why this is correct
ae interfaces represent aggregated Ethernet bundles created via Link Aggregation Control Protocol (LACP) or static configuration.
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reth
Why it's wrong here
reth interfaces are redundant Ethernet interfaces used specifically across separate nodes in a Chassis Cluster, not for local link aggregation.
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lo0
Why it's wrong here
lo0 represents the logical loopback interface used for routing protocols and management access.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIA-SEC 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-SEC exam.