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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Junos OS Fundamentals and Architecture | - System operation and maintenance basics - Junos OS process architecture and components |
| Topic 2: System Monitoring and Diagnostics | - Performance and connectivity analysis tools - Logs, traces, and system alarms |
| Topic 3: Layer 3 Routing Troubleshooting | - Static routing and route lookup issues - BGP troubleshooting - OSPF troubleshooting |
| Topic 4: Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| Topic 5: Interface and Layer 2 Troubleshooting | - VLAN and switching issues - Interface status and error diagnosis |
| Topic 6: Routing Policy and Filter Issues | - Filter evaluation and debugging - Policy application and route selection |
Juniper Junos Troubleshooting Sample Questions:
1. Click the Exhibit button.
-- Exhibit -user@router> show system processes extensive last piD. 4160; load averages: 0.13, 0.08, 0.07 up 2+02:47:50 21:13:39 120 processes: 17 running, 90 sleeping, 1 zombie, 12 waiting
Mem: 141M Active, 96M Inact, 517M Wired, 160M Cache, 112M Buf, 55M Free Swap:
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 1271 root 7 76 0 514M 63724K select 0 157.9H 280.42% flowd_octeon_hm 22 root 1 171 52 0K 16K RUN 0 43.3H 83.45% idlE. cpu0 4158 lab 1 78 0 49192K 16440K select 0 0:00 2.25% cli 1255 root 1 76 0 114M 17604K select 0 41:47 0.00% chassisd 24 root 1 -20 -139 0K 16K WAIT 0 18:50 0.00% swi7: clock 1293 root 1 76 0 12476K 6484K select 0 9:25 0.00% license-check 4159 root 1 76 0 38608K 5720K select 0 0:00 0.00% mgd
... 36 root 1 8 0 0K 16K usbevt 0 0:00 0.00% usb1 33 root 1 8 0 0K 16K usbevt 0 0:00 0.00% usb0 4160 root 1 77 0 24260K 1816K CPU0 0 0:00 0.00% top 1176 root 1 -8 0 0K 16K mdwait 0 0:00 0.00% md2 7 root 1 8 0 0K 16K - 0 0:00 0.00% thread taskq 1186 root 1 -8 0 0K 16K mdwait 0 0:00 0.00% md3 0 root 1 -8 0 0K 0K WAIT 0 0:00 0.00% swapper
-- Exhibit -
Referring to the exhibit, which Junos OS process was the last one to start?
A) flowd_octeon_hm
B) cli
C) top
D) swapper
2. Click the Exhibit button.
-- Exhibit -root@router> show system storage Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 742M 741M -6.6M 101% /junos/cf devfs 1.0K 1.0K 0B 100% /dev devfs 1.0K 1.0K 0B 100% /dev/ /dev/md0 494M 494M 0B 100% /junos /cf 742M 741M -6.6M 101% /junos/cf devfs 1.0K 1.0K 0B 100% /junos/dev/ procfs 4.0K 4.0K 0B 100% /proc /dev/bo0s3e 24M 108K 22M 0% /config /dev/bo0s3f 342M 110M 205M 35% /cf/var /dev/md1 168M 14M 141M 9% /mfs /cf/var/jail 342M 110M 205M 35% /jail/var devfs 1.0K 1.0K 0B 100% /jail/dev /dev/md2 39M 4.0K 36M 0% /mfs/var/run/utm /dev/md3 1.8M 4.0K 1.7M 0% /jail/mfs -- Exhibit -
Your device running the Junos OS has become slow and you obtain frequent errors when you try to make changes.
Referring to the exhibit, which three actions would resolve the problem? (Choose three.)
A) Issue the request system storage cleanup command.
B) Enter the shell subsystem and issue the rm -rf /junos command.
C) Issue the rollback 0 command to clear the unneeded configurations on the router.
D) Use file delete or the shell subsystem to remove files from the /var/tmp directory.
E) Issue the request system software delete-backup command.
3. Click the Exhibit button.
-- Exhibit -user@R1> show configuration interfaces xe-1/1/0 {
unit 0 { family inet {
address 17.1.1.1/24;
}
family mpls;
}
}
user@R1> ping 17.1.1.2 size 1473 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1473 data bytes
ping: sendto: Message too long
ping: sendto: Message too long
ping: sendto: Message too long
user@R1> ping 17.1.1.2 logical-system R1 size 1472 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1472 data bytes
1480 bytes from 17.1.1.2: icmp_seq=0 ttl=64 time=0.933 ms
1480 bytes from 17.1.1.2: icmp_seq=1 ttl=64 time=0.838 ms
1480 bytes from 17.1.1.2: icmp_seq=2 ttl=64 time=4.688 ms
-- Exhibit --
You are using the ping command to troubleshoot a suspected MTU problem.
A) The first ping fails because the Junos OS takes into account ICMP and IP headers while calculating the MTU.
B) The first ping fails because the Junos OS takes into account Layer 2 headers while calculating the MTU.
C) The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.
D) Referring to the exhibit, which two statements are true? (Choose two.) The first ping fails because the do-not-fragment option is set.
4. By default, in which table are OSPF routes stored on a Junos device?
A) inet.3
B) inet.0
C) inet.2
D) inet.1
5. Click the Exhibit button.
-- Exhibit -user@router> show system users
9:28PM up 2 days, 3:02, 2 users, load averages: 0.06, 0.13, 0.09 USER TTY FROM LOGIN@ IDLE WHAT lab u0 -9:13PM - -cli (cli) admin p0 10.210.15.30 9:45PM - -cli (cli) -- Exhibit -
Referring to the exhibit, which two statements are true? (Choose two.)
A) The admin user is connected through a console session.
B) The lab user's session will be cleared after issuing the command request system logout user lab.
C) The admin user is connected through a Telnet or SSH session.
D) Both user sessions will be cleared after issuing the command request system logout terminal.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A,D,E | Question # 3 Answer: A,D | Question # 4 Answer: B | Question # 5 Answer: B,C |



