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 PracticeAn engineer is preparing to perform an In-Service Software Upgrade (ISSU) on a pair of dual-RE MX240 routers. Which condition must be met to ensure the ISSU succeeds without dropping traffic?
Explanation: ISSU requires specific hardware compatibility (matching RE models, line card types), GRES and NSR configured and operating, and a supported Junos image path.
You are configuring VRRP between two EX4600 switches to provide a default gateway for a VLAN. To ensure that the switch with the higher physical interface capacity assumes the master role, what parameter should you adjust?
Explanation: VRRP master selection is determined by priority. The router with the highest priority becomes the master. You can also configure track-interface commands to lower priority if link failures occur.
An EX4300 Virtual Chassis experiences a split-brain condition due to a failure of all stacking cables between members 0/1 and members 2/3. How does Junos handle this scenario by default?
Explanation: Without auxiliary diagnostic mechanisms like Dual-Routing Engine Advanced Support (DREAS) or specifically configured split-brain detection, a split Virtual Chassis can result in duplicate primary assignments unless properly managed with master conflict resolution behaviors.
An administrator is configuring Graceful Restart on a pair of Juniper MX series routers running OSPF. What is the primary purpose of Graceful Restart in this scenario?
Explanation: Graceful Restart allows a routing platform to continue forwarding packets along known routes while its control plane is restarting, avoiding routing churn.
You 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: Member priorities within a Junos Virtual Chassis determine which switch assumes the primary or backup role. Adjusting the virtual-chassis member priority ensures deterministic primary selection.
+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.
Launch a full High Availability practice session with instant scoring and detailed explanations.
Start High Availability Practice →