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Juniper JN0-690 Exam Syllabus Topics:

Juniper Junos Troubleshooting Sample Questions:

Question 1

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 the CRC header while calculating the MTU.
B. The first ping fails because the Junos OS takes into account ICMP and IP headers while calculating the MTU.
C. The first ping fails because the Junos OS takes into account Layer 2 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.

Question 2

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 work.
C. Outbound FTP connections initiated from the router would not work.
D. Inbound FTP connections to the router would work.

Question 3

Which two commands help to identify traffic drops due to oversubscription? (Choose two.)

A. show interfaces queue
B. monitor traffic interface
C. show interfaces extensive
D. monitor interface traffic

Question 4

-- Exhibit -
[edit]
user@router# show interfaces
ge-1/1/2 {
gigether-options {
802.3ad ae0;
}
}
ge-1/1/3 {
gigether-options {
802.3ad ae0;
}
}
ae0 {
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
}
-- Exhibit -
You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:
[edit] user@router# run show interfaces ae0 error: device ae0 not found
Which command would you use to resolve this problem?

A. set chassis alarm ethernet link-down ignore
B. set chassis network-services ethernet
C. set interfaces ae0 aggregated-ether-options lacp active
D. set chassis aggregated-devices ethernet device-count 1

Question 5

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. request system storage cleanup
B. request system software add validate
C. show chassis routing-engine
D. show system storage
E. show system directory-usage

Solutions: