Operational Monitoring and Maintenance

A network engineer notices that a device is not sending SNMP traps to the NMS. Which operational command should be used to verify SNMP configuration?

A network administrator is troubleshooting high CPU usage on a Juniper router. Which command helps identify which process is consuming the most CPU?

After a software upgrade, BGP sessions are not establishing. The engineer runs 'show bgp summary' and sees that all sessions are in Idle state. What is the most likely cause?

A junior engineer needs to collect a snapshot of the current system state, including routing tables, interfaces, and configuration, for a support ticket. Which command achieves this?

A network engineer wants to schedule a reboot of a Juniper device at 3:00 AM. Which command should be used?

A router is experiencing intermittent packet loss. The engineer runs 'show interfaces ge-0/0/0 extensive' and notices a high number of input errors but no output errors. What is the most likely cause?

An engineer needs to check the last time the configuration was changed. Which command provides this information?

A BGP session is flapping. The engineer runs 'show log messages' and sees 'BGP recv Notification' with error code 'Cease'. What does this indicate?

Which TWO statements are true about the 'show interfaces ge-0/0/0 extensive' command output?

Which THREE commands are used for operational monitoring of routing protocols?

Which TWO statements are correct about the 'monitor interface' command?

You are managing a Juniper MX router that serves as a BGP route reflector for multiple customer VPNs. The router has two routing engines (RE0 and RE1) in a graceful switchover (GRES) configuration. During a routine maintenance window, you need to upgrade the Junos OS from version 18.1R1 to 20.2R2. The upgrade must minimize traffic disruption. You have already staged the new image on both REs. Which sequence of commands ensures minimal impact?

You are troubleshooting an OSPF issue on a Juniper router. The router has a single interface ge-0/0/1 with IP 10.1.1.1/30 connected to a neighbor with IP 10.1.1.2/30. OSPF is configured area 0. The 'show ospf neighbor' command shows no neighbors. 'show interfaces ge-0/0/1 terse' shows the interface is up. 'show configuration protocols ospf' shows: area 0.0.0.0 { interface ge-0/0/1.0 { passive; } } What is the problem?

A network engineer notices that traffic to a critical server is being dropped intermittently. The server is reachable via a static route on the Juniper router. The engineer checks the routing table and sees the route is present. Which operational command should the engineer use next to isolate the issue?

Which THREE statements about the 'request system snapshot' command are true? (Choose three.)

Based on the exhibit, which protocol is enabled on interface ge-0/0/0.0?

You are the network administrator for a large enterprise with a Juniper MX480 router running Junos 18.2R3. The router has two Routing Engines (RE0 and RE1) in a graceful Routing Engine switchover (GRES) configuration. During a scheduled maintenance window, you need to upgrade the Junos OS to a newer version while minimizing traffic loss. The upgrade process requires a reboot of both REs. You have staged the software on both REs. Which sequence of commands should you use to perform the upgrade with minimal disruption?

Which TWO statements correctly describe the use of the 'monitor traffic' command in Junos?

Refer to the exhibit. A network engineer sees repeated 'PFE interrupt error' messages in the log for fpc0. What is the most likely impact and recommended action?

You are managing a Juniper MX240 router at a small ISP. The router has been operating normally for months. This morning, a customer reports intermittent packet loss on their connection, which is served by interface ge-0/0/2. You SSH into the router and run 'show interfaces ge-0/0/2 extensive'. The output shows input errors increasing rapidly, including CRC errors and frame errors. The interface is up/up. You also notice that the interface statistics show a high number of carrier transitions. The cable connecting the router to the customer's CPE was recently replaced by the customer's technician. What is the most likely cause of the errors and the correct action to resolve the issue?

Arrange the steps to configure OSPF on a Junos router in the correct order.

Arrange the steps to configure a DHCP server on a Junos router.

Match each Junos security feature to its description.

Match each Junos operational command for monitoring to its output.

An administrator notices that the routing table is not updating as expected. Which command should be used to verify the routing table contents?

To monitor interface traffic in real-time, which operational command is most appropriate?

A network engineer needs to check the system's disk space usage. Which command should be used?

After a software upgrade, a router fails to boot with the new image. The engineer suspects the image is corrupted. What is the recommended method to recover?

An administrator wants to verify that BGP neighbors are established. Which command provides a summary of all BGP peer sessions?

A technician is troubleshooting a connectivity issue and needs to see the path packets take to a remote host. Which Junos command is appropriate?

During a maintenance window, an engineer plans to replace a line card. Which command sequence is most appropriate to gracefully deactivate the card before removal?

An administrator observes that the router's CPU utilization is consistently high. Which command helps identify which process is consuming the most CPU?

A network engineer needs to verify the checksum of a downloaded Junos image before installation. Which command is used?

Which two commands can be used to display real-time interface information? (Choose two.)

Which two events typically trigger a change to the routing table? (Choose two.)

Which three steps are part of a typical software upgrade process on a Juniper device? (Choose three.)

Refer to the exhibit. An engineer notices that input drops are increasing. What is the most likely cause?

Refer to the exhibit. What is the most likely cause of the BGP session failure?

Refer to the exhibit. Which route will be used to forward traffic to 192.168.1.0/24?

A network administrator wants to see the current CPU load average over the last 1, 5, and 15 minutes on a Juniper device. Which command displays this information?

A technician notices that the /var partition is filling up on a Juniper device. Which action would be most appropriate to free up space while preserving critical logs?

A network operator needs to upgrade the Junos OS on the backup RE (re1) of a dual-RE system. Which procedure ensures that only the backup RE is upgraded and rebooted without affecting the forwarding plane?

Which command displays the status of all configured interfaces, including administrative and operational status?

A network engineer suspects a hardware issue on an interface. Which command provides the most detailed hardware error counters, including CRC errors, framing errors, and runts?

An operator wants to monitor the temperature and voltage sensors on a Juniper chassis. Which command displays current sensor readings?

A technician needs to view the last 50 log messages from the system log file. Which command accomplishes this?

Which command is used to verify that the current active configuration is the same as the candidate configuration?

During a network outage, a router is unresponsive via SSH. You have console access but the console displays 'Amnesiac (ttyd0)' prompt. What is the most likely cause and recovery action?

Which TWO commands can be used to monitor system log messages in real-time?

Which THREE statements are true about the commit operation on Junos?

Which TWO commands can be used to view the current routing table entries for IPv4 unicast routes?

Refer to the exhibit. An administrator notices the /var partition is nearly full. Which command can be used to safely reclaim disk space?

Refer to the exhibit. Based on the log messages, what is the most likely cause of the interface flapping?

Refer to the exhibit. Which interface has a physical layer connectivity problem?

An engineer needs to check the current system uptime on a Juniper device running Junos OS. Which command should they use?

A network administrator wants to view the current configuration that is actively running on a Juniper device. Which operational mode command should be used?

Which command displays the version of Junos OS currently running on the device?

A network engineer notices that the device is not accepting any configuration changes. The engineer suspects the configuration database is locked. Which command can be used to confirm if the configuration is locked and by which session?

A junior administrator wants to view only the operational state of interface ge-0/0/1, including its link status and protocol state. Which command should they use?

An administrator needs to verify the current time and time zone configured on the Juniper device. Which command should they use?

A network administrator is troubleshooting a routing issue and wants to view the routing table for a specific routing instance called 'VPN-A'. Which command should they use?

An engineer needs to check if the device has any pending changes that have not been committed. Which operational command should they run?

A network technician needs to clear all BGP sessions and force BGP to re-establish peering relationships. Which command should they use?

Which two commands display the IPv4 unicast routing table? (Choose two.)

Which two commands can be used to capture the current interface statistics and save them for later analysis? (Choose two.)

Which three commands can be used to view system log messages? (Choose three.)

Refer to the exhibit. Which interface(s) have a physical layer issue?

Refer to the exhibit. Based on the log output, what is the most likely issue with interface ge-0/0/1?

Refer to the exhibit. An engineer is trying to commit a configuration but receives a 'no space left on device' error. Which filesystem is most likely full?

A network administrator is troubleshooting high latency on a link. Which command provides real-time interface statistics?

A network engineer needs to analyze NTP synchronization status and offset. Which command provides detailed NTP peer information including delay, offset, and jitter?

After a configuration change, a router is not behaving as expected. The administrator wants to rollback to the previous configuration. Which command accomplishes this?

A technician needs to monitor routing table updates in real time. Which command provides continuous output of routing changes?

An administrator is asked to check the system log files for any error messages related to interface failures. Which command would be most efficient?

A network engineer is performing a software upgrade on an MX router. Before upgrading, which operational command should be used to verify the current software version and the upgrade file?

An administrator suspects that an interface is flapping but the router is remote and the connection is intermittent. The administrator wants to monitor the interface status without maintaining an SSH session. Which approach should be used?

A Juniper device is running out of disk space on the /var partition. Which command can be used to check disk usage?

Which TWO commands can be used to view the system log messages on a Juniper device? (Select two.)

Which THREE operational commands are used to monitor interface statistics and status? (Select three.)

Which TWO methods can be used to restore a previous configuration on a Juniper device? (Select two.)

Your company runs a Juniper MX480 router as the core gateway. The router has been experiencing intermittent connectivity issues with a remote site over a point-to-point OC3 link. Users report that the link goes down for a few seconds several times a day. You suspect that the issue might be related to physical layer errors or framing. You need to determine the cause and collect relevant data to present to the service provider. Which course of action should you take first?

You are a network administrator for a large enterprise. The Juniper EX4300 switch that serves as the distribution layer for the finance department is experiencing high CPU utilization. Users are complaining of slow network performance. You have accessed the switch via console and notice that the CPU load is consistently above 90%. You need to identify the process causing the high CPU usage. Which command should you use?

A Juniper SRX300 firewall is deployed at a branch office. The firewall's disk space on /var is critically low, causing logs to stop writing and system performance degradation. You need to free up space quickly without deleting logs (they are required for compliance). Which action should you take?

You are a junior network engineer tasked with upgrading the Junos OS on a pair of EX3400 switches that are in a Virtual Chassis. You have downloaded the new software image to the primary switch. Before performing the upgrade, you must verify the image's integrity and check the current version. Which sequence of commands should you use?

Which two commands can be used to monitor real-time interface statistics and errors on a Junos device?

A network administrator notices that the CPU utilization on an MX240 router has been consistently above 90% for the past hour. Users are reporting intermittent connectivity issues. The administrator logs in and runs 'show system processes extensive' which shows the Routing Protocol Daemon (rpd) consuming 70% of the CPU. Further investigation reveals that the router has over 5000 BGP prefixes from multiple peers. The administrator suspects that the high CPU is due to continuous route processing. What should the administrator do to immediately reduce CPU load while maintaining network stability?

A service provider has two MX routers (R1 and R2) connected via two separate physical links. Both links are in an aggregated Ethernet bundle (ae0). The ae0 interface is configured with LACP active on both sides. Recently, a fiber cut occurred on one of the member links, and the aggregated interface continued working. However, after the fiber was repaired, the network operator noticed that the restored link is not being re-added to the bundle. 'show lacp interfaces' indicates the link is in a 'detached' state. The operator checks 'show interfaces diagnostics optics' and finds that the optical parameters are normal. Which action should the operator take to restore the link to the bundle without affecting traffic?

An engineer needs to check for packet errors on an interface. Which two commands provide error counter information? (Choose two.)

Refer to the exhibit. A network administrator notices intermittent connectivity issues. Based on the log messages, what is the most likely cause?

A company runs Juniper MX routers in a data center. They have a monitoring server that polls SNMP every 5 minutes. Recently, the monitoring server reported that interface ge-0/0/1 on router R1 has been down for 3 hours, but the network operations center says that no alarms were triggered and the link appears up from their end. The administrator logs into R1 and runs 'show interfaces ge-0/0/1' and sees that the interface is up with no errors, but the output shows 'Last flapped: 3 hours ago', which matches the monitoring downtime. Further investigation reveals that the interface has been administratively disabled and re-enabled at that time by an automated script that was later rolled back. The monitoring server uses ifAdminStatus and ifOperStatus OIDs. Which action would most reliably prevent this false positive in the future?