20+ practice questions focused on High Availability — one of the most tested topics on the Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT, JN0-352) (JNCIS-ENT) exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start High Availability PracticeYou are troubleshooting a Virtual Chassis formed by four EX4300 switches. The primary Routing Engine (RE) unexpectedly rebooted. Upon recovery, you notice that a different member switch has taken over the role of primary. How can you prevent this specific member from becoming the primary RE in the future?
Explanation: In a Juniper Virtual Chassis, the primary Routing Engine (RE) is elected based on the mastership priority value configured on each member. The switch with the highest priority becomes primary; if there is a tie, the one with the lowest MAC address wins. To prevent a specific member from becoming primary, you must ensure that the preferred member has a higher mastership priority than all others. Option B directly addresses this by modifying the routing-engine mastership-priority value on the preferred member to be higher, thus ensuring it becomes primary upon election. This is the standard method to control primary RE selection in a Virtual Chassis.
An administrator wants to verify that GRES is operating correctly on an MX series router with dual Routing Engines. Which operational command should be used?
Explanation: The correct command is `show chassis routing-engine`, which displays the status of both Routing Engines, including mastership, uptime, and GRES (Graceful Routing Engine Switchover) state. On MX series routers with dual REs, this command shows whether GRES is enabled and operational, along with other HA parameters. It is the standard operational command to verify GRES functionality.
You notice frequent mastership transitions in a VRRP group configured between two EX4300 switches. The logs indicate that VRRP advertisements are intermittently missing. Which troubleshooting step addresses the underlying cause without changing the master priority?
Explanation: Intermittent missing VRRP advertisements usually stem from physical-layer packet loss (CRC errors, drops, congestion) rather than VRRP configuration itself. Checking interface error counters identifies the underlying link problem, and increasing the VRRP advertisement interval makes the protocol more tolerant of transient drops without altering mastership priority. This addresses the root cause while preserving the existing priority design.
During an audit of a Juniper EX4300 Virtual Chassis, you notice that member 1 and member 2 are connected via mixed 1G and 10G uplink ports. How does Junos handle mixed-speed Virtual Chassis port configurations?
Explanation: Junos EX series virtual chassis ports can be configured for specific speeds, but mismatched or unsupported port combinations will cause initialization failures or link errors depending on the platform.
Which command displays the status of Virtual Chassis member switches, their roles, and their serial numbers on an EX series switch?
Explanation: The 'show virtual-chassis' command is the primary operational command to view member status, roles (Master/Backup/Linecard), and IDs.
+15 more High Availability questions available
Practice all High Availability questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of High Availability. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
High Availability questions on the JNCIS-ENT frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. High Availability is tested as part of the Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT, JN0-352) (JNCIS-ENT) blueprint. Practicing with targeted High Availability questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free JNCIS-ENT practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but High Availability is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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