JN0-690 - Junos Troubleshooting
Go back to
Juniper
Example Questions
Which two statements are correct about the show ospf route and the show route protocols ospf commands? (Choose two.)
show ospf route displays the entries in the Open Shortest Path First (OSPF) routing table.
show route protocols ospf displays the route entries in the routing table that were learned through OSPF.
Which CLI command is used to restart a software process?
reboot
An OSPF neighbor is stuck in the Exchange state. Which condition would cause this to happen?
a mismatched MTU
You are asked to configure traceoptions to capture all general events for rpd. Which configuration statement accomplishes this task?
[edit routing-options]
[email protected]
# show traceoptions { file rpd_log; flag general; }
An interface on your Junos device reports a device-level flag of Loopback-detected. What is causing this flag to be reported?
The interface link layer received its own frames.
In the Junos OS, which type of file dumps the program's environment in the form of memory pointers, instructions, and register data to a file in the event of a panic or other serious malfunction?
backup file
You suspect that your router is missing the .0/24 routes for your local network. You first want to look for the routes on the control plane before troubleshooting the data plane. Which operational mode command should you issue?
show route
Which three commands will provide details about CPU utilization on a line card? (Choose three.)
show chassis fpc
request pfe execute target fpc1 command "show sched"
request pfe execute target fpc1 command "show thread"
Which two commands help to identify traffic drops due to oversubscription? (Choose two.)
show interfaces extensive
show interfaces queue
Which operational CLI command would you use to troubleshoot hardware-related problems?
show route
Which two tools would be used to troubleshoot BGP peering problems? (Choose two.)
traceoptions
the monitor traffic interface command
Given the example shown below: Emergency boot media > flash disk > _____ What is missing from the default boot list?
hard disk
Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)
You must enable nonstop active routing (NSR).
You must enable graceful Routing Engine switchover (GRES).
Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)
A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
A possible cause for an overworked rpd is excessive protocol tracing.
A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
Which command would be helpful in determining the time at which the protocols started?
show system uptime
Which CLI command applies the candidate configuration to the active configuration?
copy run start
What is the name of the routing protocol process on a Junos OS device?
cosd
Which two features would be deployed to prevent DoS attacks? (Choose two.)
ARP policer
loopback filter
Which two tools will help determine the path of a routing loop? (Choose two.)
traceroute
routing table data
You have configured and successfully committed the configuration for nonstop active routing (NSR). Which command would you use to determine if NSR is operating correctly?
Use the show task replication command on the master and the backup Routing Engines.
Using Virtual Router Redundancy Protocol (VRRP), you want to statically force the priorities of the master and backup routers. Which priority would you set on the master router?
254
Which CLI command would be used to verify the routing protocol daemon memory usage?
show system processes extensive
Which operational command would be used to display diagnostic data and alarms for 1/10/100 Gigabit Ethernet optical transceivers?
show interfaces diagnostics optics
Which three statements are correct about ARP related troubleshooting? (Choose three.)
Most devices that run the Junos OS allow you to specify a manual ARP entry.
The monitor traffic interface <interface-name> command can be used to watch ARP packets.
An individual ARP entry can be cleared using the clear arp hostname command.
A technician has reported an alarm on your device running the Junos OS. You suspect it is due to the temperature in the rack. Which two commands will confirm your suspicion? (Choose two.)
show chassis alarms
show chassis environment
Which operational CLI command would you use to display information about the system and software processes?
show route
You have been asked to troubleshoot an interface that is flapping. Which three tools would you use to isolate the cause? (Choose three.)
syslog messages
loopback interface testing
show interfaces
By default, in which table are OSPF routes stored on a Junos device?
inet.0
Which three steps are involved in troubleshooting any problem? (Choose three.)
Clearly define the problem.
Outline the expected behavior.
Isolate the problem.
Two neighboring routers running OSPF were configured with the same router ID by mistake. Which OSPF operational mode command would report the number of hello packets received with the local router's router ID?
show ospf statistics
Which two Junos OS commands are helpful in confirming whether an Object Identifier (OID) has recorded the correct data? (Choose two.)
show snmp mib get
show snmp mib walk
You are asked to provide an audit trail for all user activity on your Junos device. Which syslog configuration statement accomplishes this task?
user * { any emergency; } file messages { any notice; authorization info; } file interactive-commands { interactive-commands any; }
Which two statements are true regarding BGP path MTU discovery? (Choose two.)
BGP path MTU discovery provides the most efficient use of link bandwidth.
BGP path MTU discovery alleviates fragmentation problems.
Which two statements are true about firewall filters and policers? (Choose two.)
If an input firewall filter is configured on the same logical interface as a policer, the policer is executed first.
If an output firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
Which route would a packet destined to 192.168.14. take?
192.168.14.0/24 *[BGP/70]
A client has reported that they cannot establish an FTP connection to your Junos device. Which command would you use to diagnose the problem?
monitor traffic interface