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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Layer 2 and Switching Troubleshooting | - VLAN and bridging issues
|
| Topic 2: Routing Policy and Firewall Filters | - Policy evaluation and debugging
|
| Topic 3: VPN and Service Troubleshooting | - IPsec VPN issues
|
| Topic 4: System Operations and Device Health | - Chassis and hardware status
|
| Topic 5: Troubleshooting Methodology and Tools | - Junos operational commands (ping, traceroute, monitor traffic)
|
| Topic 6: Layer 3 Routing Troubleshooting | - BGP troubleshooting
|
Juniper Junos Troubleshooting Sample Questions:
Click the Exhibit button.
-- Exhibit -[edit] user@router# show interfaces
ge-1/1/2 {
vlan-tagging;
unit 100 {
vlan-id 100;
family inet {
address 192.168.0.1/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.10.10.1/32;
}
}
}
[edit]
user@router# show protocols ospf
area 0.0.0.0 {
interface ge-1/1/2.0 {
interface-type p2p;
metric 250;
}
interface lo0.0;
}
[edit]
user@router# run show ospf interface Interface State Area DR ID BDR ID Nbrs lo0.0 DR 0.0.0.0 10.10.10.1 0.0.0.0 0
[edit] user@router# -- Exhibit -
Referring to the exhibit, why does only the loopback interface appear in the show ospf interface output?
- A. The incorrect logical unit for the ge-1/1/2 interface is configured under the OSPF hierarchy.
- B. The ge-1/1/2 interface is configured under the wrong OSPF area.
- C. The interface-type is not configured properly on the ge-1/1/2 interface.
- D. The metric configured on ge-1/1/2 is not valid.
Correct Answer: A 🗳️
Which two commands help to identify traffic drops due to oversubscription? (Choose two.)
- A. monitor interface traffic
- B. show interfaces extensive
- C. show interfaces queue
- D. monitor traffic interface
Correct Answer: B,C 🗳️
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 software delete-backup command.
- B. Issue the request system storage cleanup command.
- C. Use file delete or the shell subsystem to remove files from the /var/tmp directory.
- D. Issue the rollback 0 command to clear the unneeded configurations on the router.
- E. Enter the shell subsystem and issue the rm -rf /junos command.
Correct Answer: A,B,C 🗳️
Which three commands will provide details about CPU utilization on a line card? (Choose three.)
- A. request pfe execute target fpc1 command "show thread"
- B. request pfe execute target fpc1 command "show sched"
- C. show chassis hardware
- D. request pfe execute target fpc1 command "show arp"
- E. show chassis fpc
Correct Answer: A,B,E 🗳️
Click the Exhibit button.
-- Exhibit -user@R1> show pfe statistics traffic Packet Forwarding Engine traffic statistics:
Input packets: 47593914461368 2 pps Output packets: 28805646 3 pps Packet Forwarding Engine local traffic statistics: Local packets input : 36278104324
Local packets output : 2
Software input control plane drops : 0
Software input high drops : 0
Software input medium drops : 0
Software input low drops : 0
Software output drops : 0
Hardware input drops : 191367536738 Packet Forwarding Engine local protocol statistics:
HDLC keepalives : 0
ATM OAM : 0
Frame Relay LMI : 0
PPP LCP/NCP : 0
OSPF hello : 3883169
OSPF3 hello : 0
RSVP hello : 1440704
LDP hello : 4782297
BFD : 0
IS-IS IIH : 0
LACP : 0
ARP : 765512
ETHER OAM : 0
Unknown : 1897610 Packet Forwarding Engine hardware discard statistics:
Timeout : 0
Truncated key : 0
Bits to test : 0
Data error : 0 Stack underflow : 0 Stack overflow : 0 Normal discard : 191367536738 Extended discard : 0 Invalid interface : 0 Info cell drops : 191367536738 Fabric drops : 191367536738
Packet Forwarding Engine Input IPv4 Header Checksum Error and Output MTU Error statistics: Input Checksum : 0 Output MTU : 0
-- Exhibit -
Referring to the exhibit, which counter indicates a possible denial of service attack?
- A. hardware input drops
- B. info cell drops
- C. normal discard
- D. fabric drops
Correct Answer: A 🗳️
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