Junos Troubleshooting Exam Objectives (Exam: JN0-691)

Troubleshooting Methodology
Identify the elements to build a framework for approaching troubleshooting Junos devices
General troubleshooting methodology
Broad troubleshooting steps
Identify tools that can be used to troubleshoot Junos devices
CLI
Craft interface
Logging
Traceoptions
Real-time monitoring
Core files
Port mirroring
Identify tools that can be used for device and network monitoring
SNMP
RMON
Sampling

Chassis Monitoring and Troubleshooting
Identify the concepts, tools and features used to monitor and troubleshoot chassis-related components of Junos devices
Chassis
RE and PFE components
Fans and power supplies
System
Storage and file system
Boot media and start-up sequence
System software
Backups
Given a scenario, demonstrate knowledge of how to monitor and troubleshoot the chassis and core system components of Junos devices
show commands
Logging

Control Plane Monitoring and Troubleshooting
Identify the concepts, tools and features used to monitor and troubleshoot the control plane of Junos devices
System processes
User processes
ARP
RIB/FIB
Given a scenario, demonstrate knowledge of how to monitor and troubleshoot the control plane of Junos devices
show commands
clear commands
monitor commands
Logging
Traceoptions

Data Plane Monitoring and Troubleshooting
Identify the concepts, tools and features used to monitor and troubleshoot the data plane of Junos devices
PFE issues
Ethernet interfaces
MTU issues
Link flapping
Forwarding table issues
PFE load balancing
Local vs. transit traffic
Firewall filters and policers
Given a scenario, demonstrate knowledge of how to monitor and troubleshoot the data plane of Junos devices
request commands
show commands
monitor commands
clear commands
Loopback testing

Layer 2 and Layer 3 Protocol Monitoring and Troubleshooting
Identify the concepts, tools and features used to monitor and troubleshoot Layer 3 protocols on Junos devices
Routing table information
Routing loops
OSPF neighbors
OSPF adjacencies
BGP peering and peer groups
BGP neighbor states
Identify the concepts, tools and features used to monitor and troubleshoot Layer 2 protocols on Junos devices
VLAN’s
bridging concepts
xSTP protocols
switching table
Given a scenario, demonstrate knowledge of how to perform basic monitoring and troubleshooting of Layer 3 protocols on Junos devices
show commands
clear commands
Traceoptions
Given a scenario, demonstrate knowledge of how to perform basic monitoring and troubleshooting of Layer 2 protocols on Junos devices
show commands
clear commands
Traceoptions

High Availability (HA) Monitoring and Troubleshooting
Identify the concepts, tools and features used to monitor and troubleshoot HA components for Junos devices
Graceful Routing Engine switchover (GRES)
Graceful restart (GR)
Nonstop active routing/bridging
Virtual router redundancy protocol (VRRP)
Link aggregation groups (LAG)
Unified in-service software upgrade (ISSU)
Given a scenario, demonstrate knowledge of how to perform monitoring and troubleshooting of HA features on Junos devices
monitor commands
show commands
request commands
QUESTION 2
Click the Exhibit button.
Which command removes only the ARP entries associated with the ge-0/0/0.0 interface?

A. clear arp | match ge-0/0/0.0
B. clear arp hostname”10.200.14.130|10.210.14.139|10.210.14.190″
C. C.clear arp | except “ge-0/0/3|ge-0/0/4.104|ge-0/0/5.105”
D. clear arp interface ge-0/0/0

Answer: A

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QUESTION 3
Which two statements are true about the Junos chassis daemon? (Choose two.)

A. You can parse the chassis daemon log to view the details and time lines for hardware events that have occurred.
B. Theshow log dcdcommand allows you to view chassis related events.
C. You cannot parse the chassis daemon log to view the details andtimelines for hardware events that have occurred.
D. Theshow log chassisdcommand allows you to view chassis related events.

Answer: A,D

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QUESTION 4
What are three categories of core files on a Junos device? (Choose three.)

A. PFE
B. Process
C. FPC
D. Kernel
E. PIC

Answer: B,D,E

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QUESTION 5
You must verify end-to-end connectivity within your network.
Which two troubleshooting tools meet this objective? (Choose two.)

A. ping
B. SNMP
C. traceroute
D. RMON

Answer: A,C

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