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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting Methodology & Tools | 15% | - Logging, monitoring & packet capture tools - Systematic troubleshooting approach - Junos CLI commands & diagnostic utilities |
| Topic 2: Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Topic 3: High Availability & Network Services | 15% | - DHCP, DNS, NTP & authentication services - Chassis cluster & redundancy groups - Graceful restart & non-stop routing |
| Topic 4: Control Plane Troubleshooting | 20% | - Control plane protection & DDoS mitigation - Protocol control messages & routing tables - Routing Engine operations & health |
| Topic 5: Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP |
| Topic 6: Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Hardware components & status monitoring - Boot process & system startup problems |
Juniper Junos Troubleshooting Sample Questions:
-- 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 is incompatible with the version running on the master.
- B. The synchronization failed because the Routing Engine models are different between the master and backup.
- C. The synchronization failed because the Junos OS version on the backup does not support GRES.
- D. The synchronization failed because the master Routing Engine cannot communicate with the backup Routing Engine.
Correct Answer: A 🗳️
In Junos, which process has its own internal task scheduler?
- A. mgd
- B. chassisd
- C. ppmd
- D. rpd
Correct Answer: D 🗳️
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.)
- A. The Flexible PIC Concentrator (FPC) in slot 6 is online and working.
- B. The Flexible PIC Concentrator (FPC) in slot 1 is not installed properly for this chassis.
- C. The Control Board in slot 0 has a missing CPU.
- D. The Control Board in slot 6 is online and working.
- E. The card in slot 3 is not supported by the chassis.
Correct Answer: A,B,E 🗳️
Which two tools will help determine the path of a routing loop? (Choose two.)
- A. routing table data
- B. traceoptions
- C. SNMP
- D. traceroute
Correct Answer: A,D 🗳️
Which three statements are true about performing an ISSU on a Junos device? (Choose three.)
- A. Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."
- B. Every PFE on each FPC downloads the new software from the backup RE.
- C. The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
- D. The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
- E. ksyncd synchronizes the kernel on the backup RE with the master RE.
Correct Answer: B,D,E 🗳️
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