Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| Interface and Layer 2 Troubleshooting | - VLAN and switching issues - Interface status and error diagnosis |
| System Monitoring and Diagnostics | - Logs, traces, and system alarms - Performance and connectivity analysis tools |
| Routing Policy and Filter Issues | - Policy application and route selection - Filter evaluation and debugging |
| Layer 3 Routing Troubleshooting | - BGP troubleshooting - OSPF troubleshooting - Static routing and route lookup issues |
| Junos OS Fundamentals and Architecture | - Junos OS process architecture and components - System operation and maintenance basics |
Juniper Junos Troubleshooting Sample Questions:
1. You are asked to provide an audit trail for all user activity on your Junos device.
Which syslog configuration statement accomplishes this task?
A) user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
B) user * {
any any;
}
file messages {
any notice;
authorization info;
}
C) user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file audit-commands {
authorization any;
}
D) user * {
any any;
}
file messages {
any info;
authorization info;
}
2. 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 Layer 2 headers while calculating the MTU.
B) The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.
C) The first ping fails because the Junos OS takes into account ICMP and IP headers 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.
3. Which two statements are true about firewall filters and policers? (Choose two.)
A) If an input firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
B) If an output firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
C) If an output firewall filter is configured on the same logical interface as a policer, the policer is executed first.
D) If an input firewall filter is configured on the same logical interface as a policer, the policer is executed first.
4. An interface on your Junos device reports a device-level flag of Loopback-detected.
What is causing this flag to be reported?
A) The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.
B) The interface link layer received its own frames.
C) The link-layer protocol failed to successfully connect with the remote endpoint.
D) The interface was administratively disabled.
5. Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)
A) A possible cause for an overworked rpd is excessive protocol tracing.
B) Excessive protocol tracing can never be a cause for an overworked rpd.
C) A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
D) A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
E) A log for rpd scheduler slip is a common, harmless syslog and can be ignored.
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: C,D | Question # 3 Answer: B,D | Question # 4 Answer: B | Question # 5 Answer: A,C,D |
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