Failing the JN0-691 exam means paying the registration fee all over again, and those fees add up fast. Candidates in 2026 use the Juniper Junos Troubleshooting practice questions at ActualCollection to walk into the test already knowing what the real thing feels like.
Juniper JN0-691 Exam Overview:
| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos Troubleshooting |
| Exam Number: | JN0-691 |
| Related Certifications: | JNCSP-ENT JNCIP-ENT JNCIS-ENT |
| Passing Score: | 65% |
| Real Exam Qty: | 65 |
| Certificate Validity Period: | 3 years |
| Exam Format: | Scenario-based, Multiple Choice |
| Exam Price: | USD 300 |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Recommended Training: | Junos Troubleshooting (JT) Course Advanced Junos Enterprise Routing & Switching |
| Exam Registration: | Pearson VUE Registration Juniper Certification Portal |
| Sample Questions: |  |
| Exam Way: | Proctored; available at Pearson VUE test centers or via OnVUE online proctoring |
| Pre Condition: | JNCIS-ENT certification or equivalent Junos OS experience recommended |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/resources/jncsp-jt/ |
Juniper JN0-691 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Routing Protocol Troubleshooting | 20% | - OSPF operation and neighbor issues - BGP session and route advertisement - Routing policy and filter problems - IS-IS and RIP troubleshooting |
| Topic 2: Chassis and Hardware Troubleshooting | 20% | - Power and cooling issues - Hardware component status and alarms - Software upgrade and boot issues - Interface and media problems |
| Topic 3: Control Plane Troubleshooting | 25% | - Protocol daemon behavior - Routing table inconsistencies - Routing engine health and performance - High availability and redundancy |
| Topic 4: Switching and Services Troubleshooting | 15% | - Management and security services - VLAN and trunking issues - Class of Service (CoS) problems - Layer 2 connectivity and STP |
| Topic 5: Troubleshooting Methodology | 20% | - Systematic troubleshooting process - Monitoring and logging tools - Junos OS diagnostic commands - Packet capture and traffic analysis |
Juniper JN0-691 Exam: Frequently Asked Questions
The Juniper Junos Troubleshooting exam is the official Juniper Networks test registered under exam code JN0-691. Passing it earns you the Juniper Networks Certified Support Professional - Junos Troubleshooting (JNCSP-JT) certification, a credential at the Professional level. It is also linked to the related certifications: JNCSP-ENT, JNCIP-ENT, JNCIS-ENT. Juniper Networks exams are valued because they test job-ready skills, so a passing score here carries real weight on a resume.
The Juniper Junos Troubleshooting exam includes 65 questions to be completed within 90 minutes. Do the pacing math before exam day: with that many items on the clock, you need a steady rhythm and the discipline to flag a hard question and move on instead of stalling. Two or three full timed sessions with the ActualCollection test engine will show you exactly what that pace feels like, so time pressure stops being a factor on the real day.
To pass the Juniper Junos Troubleshooting exam you need 65%, and the official registration fee is USD 300. A retake is not discounted: a failed attempt means paying the full USD 300 again, so treat your first sitting as the expensive one. A sensible rule is to book your seat only after you are scoring comfortably above the passing mark on the ActualCollection practice tests, not just squeaking past it once.
JNCIS-ENT certification or equivalent Junos OS experience recommended
Eligibility rules do change from time to time, so confirm the current requirements before you register on the official exam page.
Registration for the Juniper Junos Troubleshooting exam goes through the official channels below.
As for the delivery format, the exam is taken Proctored; available at Pearson VUE test centers or via OnVUE online proctoring.
Juniper Networks points candidates toward the following training options for Juniper Junos Troubleshooting.
Course work builds the foundation; question practice makes it stick. The 135 practice questions in the ActualCollection JN0-691 package let you rehearse each topic under exam-style pressure before the real thing.
Yes. ActualCollection offers a free PDF demo of the Juniper Junos Troubleshooting material so you can judge the question quality and format before spending anything. After purchase, your license includes 365 days of free updates, and if you want to keep receiving updates after that period, renewals are available at a 50% discount.
If you take the Juniper Junos Troubleshooting exam within 60 days of your purchase and do not pass, ActualCollection backs you with a 100% money-back guarantee. The claim must match the exam your product covers: attempts taken within 3 days of purchase are not eligible (that is too little preparation time), and neither are downloaded-but-unused products, free materials, or expired orders. The candidate name must match the payer name, and you need to submit a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Prefer not to refund? You can swap instead and receive two other exam products of equal value for free while keeping the update service on your original purchase.
Delivery itself is instant: your files are downloadable right away and emailed to you within one minute of payment. If nothing arrives within 2 hours, contact customer service. There is no limit on how many computers you may install the software on.
The official Juniper Junos Troubleshooting syllabus is organized into 5 domains. Key areas include Routing Protocol Troubleshooting (20%), Troubleshooting Methodology (20%), and Chassis and Hardware Troubleshooting (20%). The complete, up-to-date topic list appears in the exam topics section above; work through it line by line and flag anything you cannot yet explain in your own words.
Juniper Junos Troubleshooting Sample Questions:
Question 1
Which two features would be deployed to prevent DoS attacks? (Choose two.)
A. Bidirectional Forward Detection (BFD)
B. loopback filter
C. ARP policer
D. periodic packet management (PPM)
Question 2
Click the Exhibit button.
-- Exhibit -=================== Bootstrap installer starting =================== Initialized the environment Routing engine model is RE-S-1800x4 Discovered that flash disk = ad0 , hard disk = ad1 mount: /dev/ad1s1f : Invalid argument ERROR: mount_partition: Mount /dev/ad1s1a /mnt failed You are now in a debugging subshell (you may not see a prompt)... # -- Exhibit -
During the boot of your MX480, you see the output shown in the exhibit. Which three statements are true? (Choose three.)
A. You must swap the Routing Engine over to the backup slot to get it to boot properly.
B. Running fsck on the partition might resolve the boot problem.
C. The boot failed because one of the file systems is in an inconsistent state.
D. The Routing Engine cannot mount the partition to complete booting.
E. The boot failed because a USB drive has been inserted into the device.
Question 3
Click the Exhibit button.
-- Exhibit --
[edit]
user@router# show interfaces
ge-1/1/2 {
vlan-tagging;
unit 100 {
vlan-id 100;
family inet {
address 192.168.0.1/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.10.10.1/32;
}
}
}
[edit]
user@router# show protocols ospf
area 0.0.0.0 {
interface ge-1/1/2.0 {
interface-type p2p;
metric 250;
}
interface lo0.0;
}
[edit]
user@router# run show ospf interface
Interface State Area DR ID BDR ID Nbrs
lo0.0 DR 0.0.0.0 10.10.10.1 0.0.0.0 0
[edit]
user@router#
-- Exhibit -
Referring to the exhibit, why does only the loopback interface appear in the show ospf interface output?
A. The metric configured on ge-1/1/2 is not valid.
B. The ge-1/1/2 interface is configured under the wrong OSPF area.
C. The incorrect logical unit for the ge-1/1/2 interface is configured under the OSPF hierarchy.
D. The interface-type is not configured properly on the ge-1/1/2 interface.
Question 4
Which route would a packet destined to 192.168.14. take?
A. 192.168.14.0/24 *[BGP/100]
B. 192.168.64.0/21 *[Direct/0]
C. 192.168.14.0/24 *[BGP/70]
D. 192.168.14.0/24 *[BGP/200]
Question 5
-- Exhibit -
user@router> show system switchover
Graceful switchover: On
Configuration databasE.Ready
Kernel databasE.Version incompatible
Peer statE.Steady State
-- Exhibit -
You have enabled graceful Routing Engine switchover (GRES). During verification, you switched mastership and all interfaces went down.
Referring to the output shown in the exhibit, why did the interfaces go down?
A. The synchronization failed because the Junos OS version on the backup does not support GRES.
B. The synchronization failed because the Junos OS version on the backup is incompatible with the version running on the master.
C. The synchronization failed because the Routing Engine models are different between the master and backup.
D. The synchronization failed because the master Routing Engine cannot communicate with the backup Routing Engine.
Solutions:
| Question 1 Answer: B,C | Question 2 Answer: B,C,D | Question 3 Answer: C | Question 4 Answer: C | Question 5 Answer: B |
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