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Juniper JN0-690 Exam Syllabus Topics:

SectionWeightObjectives
Layer 2 & Layer 3 Protocol Troubleshooting15%- OSPF, BGP, IS-IS & RIP
- Ethernet, VLAN, STP & LACP
- VRRP, BFD & high availability protocols
Data Plane & Interfaces Troubleshooting20%- Interface configuration, status & errors
- Forwarding table & packet flow analysis
- CoS, filters & policer issues
Control Plane Troubleshooting20%- Protocol control messages & routing tables
- Control plane protection & DDoS mitigation
- Routing Engine operations & health
Chassis & Hardware Troubleshooting15%- Power, cooling & FPC/PIC issues
- Boot process & system startup problems
- Hardware components & status monitoring
High Availability & Network Services15%- Chassis cluster & redundancy groups
- Graceful restart & non-stop routing
- DHCP, DNS, NTP & authentication services
Troubleshooting Methodology & Tools15%- Junos CLI commands & diagnostic utilities
- Systematic troubleshooting approach
- Logging, monitoring & packet capture tools

Juniper Junos Troubleshooting Sample Questions:

1. Which operational command would be used to display diagnostic data and alarms for 1/10/100 Gigabit Ethernet optical transceivers?

A) show interfaces diagnostics optics
B) show interfaces controller
C) show chassis alarms
D) show interfaces extensive


2. Which three statements are true about performing an ISSU on a Junos device? (Choose three.)

A) ksyncd synchronizes the kernel on the backup RE with the master RE.
B) Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."
C) The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
D) The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
E) Every PFE on each FPC downloads the new software from the backup RE.


3. Which CLI command would be used to verify the routing protocol daemon memory usage?

A) show route summary
B) show chassis routing-engine
C) show system processes extensive
D) show route detail


4. Which route would a packet destined to 192.168.14. take?

A) 192.168.14.0/24 *[BGP/70]
B) 192.168.14.0/24 *[BGP/100]
C) 192.168.14.0/24 *[BGP/200]
D) 192.168.64.0/21 *[Direct/0]


5. Which three steps are involved in troubleshooting any problem? (Choose three.)

A) Determine who made the changes.
B) Outline the expected behavior.
C) Clearly define the problem.
D) Isolate the problem.
E) Reboot the device.


Solutions:

Question # 1
Answer: A
Question # 2
Answer: A,C,E
Question # 3
Answer: C
Question # 4
Answer: A
Question # 5
Answer: B,C,D

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