JN0-690 Online Practice Questions and Answers

Which CLI command applies the candidate configuration to the active configuration?

A. load

B. merge

C. copy run start

D. commit

Which operational command would be used to display diagnostic data and alarms for 1/10/100 Gigabit Ethernet optical transceivers?

A. show interfaces extensive

B. show interfaces diagnostics optics

C. show chassis alarms

D. show interfaces controller

Which command is useful in testing the correct operation of an SNMP configuration toward an NMS?

A. show snmp rmon

B. show snmp mib

C. show snmp v3

D. request snmp spoof-trap

What controls the CLI process?

A. chassis control daemon

B. management daemon

C. routing protocol process

D. device control daemon

An interface on your Junos device reports a device-level flag of Loopback-detected. What is causing this flag to be reported?

A. The link-layer protocol failed to successfully connect with the remote endpoint.

B. The interface was administratively disabled.

C. The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.

D. The interface link layer received its own frames.

Which two tools will help determine the path of a routing loop? (Choose two.)

A. traceroute

B. traceoptions

C. routing table data

D. SNMP

Click the Exhibit button.

-- Exhibit

user@router> show configuration system services | display inheritance ssh; telnet; -- Exhibit -

Referring to the exhibit, which two statements are true? (Choose two.)

A. Inbound FTP connections to the router would not work.

B. Outbound FTP connections initiated from the router would not work.

C. Inbound FTP connections to the router would work.

D. Outbound FTP connections initiated from the router would work.

Click the Exhibit button.

-- Exhibit -user@host> request system software add

...

WARNING: The /var filesystem is low on free disk space.

WARNING: This package requires 1 k free, but there

WARNING: is only 666502k available.

-- Exhibit -Which three commands are useful in identifying and addressing the cause of the lack of disk space? (Choose three.)

A. show chassis routing-engine

B. show system storage

C. show system directory-usage

D. request system software add validate

E. request system storage cleanup

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. Referring to the exhibit, which two statements are true? (Choose two.)The first ping fails because the do-not-fragment option is set.

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 ICMP and IP headers while calculating the MTU.

D. The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.

-- Exhibit -user@router> show system switchover Graceful switchover: On Configuration databasE. Ready Kernel databasE. Version incompatible Peer statE. Steady State -- Exhibit -

You have enabled graceful Routing Engine switchover (GRES). During verification, you switched mastership and all interfaces went down.

Referring to the output shown in the exhibit, why did the interfaces go down?

A. The synchronization failed because the Junos OS version on the backup is incompatible with the version running on the master.

B. The synchronization failed because the Junos OS version on the backup does not support GRES.

C. The synchronization failed because the Routing Engine models are different between the master and backup.

D. The synchronization failed because the master Routing Engine cannot communicate with the backup Routing Engine.