I always wanted to get an update every time I prepare for my test.
A study bundle only helps when it mirrors the real thing, and the Juniper Junos Troubleshooting materials at Prep4sureGuide recreate the JN0-690 exam's format and timing so your practice sessions feel like rehearsal, not guesswork.
| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos Troubleshooting |
| Exam Number: | JN0-690 |
| Related Certifications: | JNCIS-SEC JNCIP-SEC JNCIA-Junos |
| Certificate Validity Period: | 3 Years |
| Real Exam Qty: | 70 |
| Exam Price: | $200–$300 USD |
| Passing Score: | 65-70% |
| Exam Format: | Fill in the Blank, Drag and Drop, Multiple Choice |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Recommended Training: | Junos Troubleshooting (EDU-JUN-IJS) Introduction to Junos Operating System |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | ![]() |
| Exam Way: | In-person at Pearson VUE test centers; retired April 30, 2015, replaced by JN0-691 |
| Pre Condition: | Recommended: JNCIA-Junos certification or equivalent knowledge; working experience with Junos OS |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification.html |
| Section | Weight | Objectives |
|---|---|---|
| Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Troubleshooting Methodology & Tools | 15% | - Logging, monitoring & packet capture tools - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach |
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP |
| Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Boot process & system startup problems - Hardware components & status monitoring |
| Control Plane Troubleshooting | 20% | - Control plane protection & DDoS mitigation - Protocol control messages & routing tables - Routing Engine operations & health |
| High Availability & Network Services | 15% | - DHCP, DNS, NTP & authentication services - Chassis cluster & redundancy groups - Graceful restart & non-stop routing |
Which CLI command applies the candidate configuration to the active configuration?
Correct Answer: D 🗳️
Explanation: Only visible for Prep4sureGuide members. You can sign-up / login (it's free).
Click the Exhibit button.
-- Exhibit -
Slot 0 information: State Online Total CPU DRAM ---- CPU less FPC ---Start time 2012-07-07 03:21:00 UTC Uptime 27 minutes, 51 seconds Slot 1 information: State Present Reason --- Hardware Not In Right Slot --Slot 2 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:20:59 UTC Uptime 27 minutes, 52 seconds Slot 3 information: State Present Reason --- Hardware Not Supported --Total CPU DRAM 0 MB Slot 6 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:21:01 UTC Uptime 27 minutes, 50 seconds
-- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)
Correct Answer: A,B,E 🗳️
What controls the CLI process?
Correct Answer: A 🗳️
-- Exhibit -
[edit]
user@router# show interfaces
ge-1/1/2 {
gigether-options {
802.3ad ae0;
}
}
ge-1/1/3 {
gigether-options {
802.3ad ae0;
}
}
ae0 {
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
}
-- Exhibit -
You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:
[edit] user@router# run show interfaces ae0 error: device ae0 not found
Which command would you use to resolve this problem?
Correct Answer: C 🗳️
-- Exhibit -[edit] user@R1# run show interfaces ge-1/1/2 terse Interface Admin Link Proto Local Remote ge-1/1/2 up up ge-1/1/2.0 up up aenet --> ae0.0
[edit] user@R1# run show interfaces ge-1/1/3 terse Interface Admin Link Proto Local Remote ge-1/1/3 up up ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R1# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R1# show interfaces ae0
aggregated-ether-options {
lacp {
periodic slow;
system-priority 200;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
**************************************************************************
[edit]
user@R2# run show interfaces ge-1/1/2 terse
Interface Admin Link Proto Local Remote
ge-1/1/2 up up
ge-1/1/2.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ge-1/1/3 terse
Interface Admin Link Proto Local Remote
ge-1/1/3 up up
ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R2# show interfaces ae0
aggregated-ether-options {
lacp {
periodic fast;
system-priority 100;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
-- Exhibit --
You have configured a LAG and are now enabling LACP on the ae0 interface. You have configured and committed the configuration as shown in the exhibit. However, the exhibit also shows that the ae0 interface is now in the up/down state.
What must you do to resolve this problem?
Correct Answer: A 🗳️
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