JNCIA-JUNOS Junos OS Fundamentals — All Questions With Answers

Refer to the exhibit.

user@router> show configuration interfaces ge-0/0/0
unit 0 {
    family inet {
        address 10.0.0.1/30;
    }
}

user@router> show interfaces terse ge-0/0/0
Interface               Admin Link Proto    Local                 Remote
ge-0/0/0                up    up   inet     10.0.0.1/30

user@router> ping 10.0.0.2 count 1
PING 10.0.0.2 (10.0.0.2): 56 data bytes
^C
--- 10.0.0.2 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss

Refer to the exhibit.

user@router> show log messages | match "kernel"
Jan 10 10:00:00 router kernel: pid 1234 (rpd), uid 0, was killed: out of swap space
Jan 10 10:00:01 router kernel: pid 1235 (rpd), uid 0, was killed: out of swap space

Refer to the exhibit.
```
user@router> show route protocol static

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.1.0/24     *[Static/5] 00:10:00, metric 0
                    > to 192.168.1.1 via ge-0/0/0.0
10.0.2.0/24     *[Static/5] 00:10:00, metric 0
                    > to 192.168.1.2 via ge-0/0/0.0
192.168.1.0/24  *[Direct/0] 00:15:00, metric 0
                    > via ge-0/0/0.0
```

Refer to the exhibit.

user@router> show route protocol static

inet.0: 4 destinations, 4 routes (4 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

192.168.1.0/24     *[Static/5] 00:10:00, metric2 0
                    > to 10.0.0.1 via ge-0/0/0.0
                    [Static/5] 00:05:00, metric2 0
                      to 10.0.0.2 via ge-0/0/1.0

192.168.2.0/24     *[Static/5] 00:15:00, metric2 0
                    > to 10.0.0.1 via ge-0/0/0.0

Refer to the exhibit.

From the output of 'show system storage':
Filesystem       Size    Used    Avail   Use%   Mounted on
/dev/da0s1a      1.9G    1.2G    600M     66%   /
devfs            1.0K    1.0K      0B    100%   /dev
/dev/md0         1.5G    1.4G     42M     97%   /var
/dev/da0s1e      190M     34M    142M     19%   /config

Refer to the exhibit.

Configuration snippet:
system {
    syslog {
        file messages {
            any notice;
            authorization info;
        }
        file interactive-commands {
            interactive-commands any;
        }
    }
}

Refer to the exhibit.

From the output of 'show system commit':
0   2024-03-15 14:00:00 UTC by root via cli
1   2024-03-14 10:00:00 UTC by admin via cli
2   2024-03-13 08:00:00 UTC by root via cli

Refer to the exhibit.
user@router> show system commit
0   2025-03-20 10:15:23 UTC by admin via cli
1   2025-03-20 09:45:10 UTC by root via cli (confirmed)
2   2025-03-19 14:30:00 UTC by admin via cli

Refer to the exhibit.
set system syslog host 10.10.10.1 any any
set system syslog archive size 100k files 3

Refer to the exhibit.
user@router> show log messages | match "sshd"
Mar 20 10:20:00 router sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Mar 20 10:20:10 router sshd[1235]: Failed password for root from 192.168.1.100 port 22 ssh2
Mar 20 10:20:20 router sshd[1236]: Failed password for root from 192.168.1.100 port 22 ssh2

Refer to the exhibit.

root@router> show configuration interfaces 
ge-0/0/0 {
    unit 0 {
        family inet {
            address 192.168.1.1/24;
        }
    }
}

root@router> show interfaces ge-0/0/0 terse              
Interface               Admin Link Proto    Local                 Remote
ge-0/0/0                up    up   inet     192.168.1.1/24

Refer to the exhibit.

root@router> show log messages | match "login"
Jun 15 10:30:22 router login: LOGIN FAILED FOR user1 FROM 10.0.0.2
Jun 15 10:30:25 router login: LOGIN FAILED FOR user1 FROM 10.0.0.2
Jun 15 10:30:28 router login: LOGIN FAILED FOR user1 FROM 10.0.0.2

Refer to the exhibit.

root@router# show system syslog
user.info {
    file messages;
}
authorization {
    file interactive-commands;
}

root@router> show log messages | last 10
Jun 15 12:00:01 router xntpd[1234]: time reset +0.1 sec
Jun 15 12:05:00 router sshd[5678]: Accepted password for admin from 10.0.0.1 port 22

Refer to the exhibit.

user@router> show configuration interfaces ge-0/0/0
unit 0 {
    family inet {
        address 10.0.0.1/24;
    }
}

user@router> show interfaces terse ge-0/0/0
Interface               Admin Link Proto    Local                 Remote
ge-0/0/0                up    up   inet     10.0.0.1/24

user@router> monitor traffic interface ge-0/0/0 extensive
...
verbose output suppressed
...
PACKET: 0 received, 0 sent