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Juniper Junos Troubleshooting Sample Questions:

1. You are asked to configure traceoptions to capture all general events for rpd.
Which configuration statement accomplishes this task?

A) [edit routing-instances]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
B) [edit routing-options]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
C) [edit protocols]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
D) [edit forwarding-options]
user@router# show
traceoptions {
file rpd_log;
flag general;
}

2. You are notified about a router reboot event.
Which command would be helpful in determining the reason for the last reboot?

A) show system snapshot
B) show chassis craft-interface
C) show chassis routing-engine
D) show system reboot

3. 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

4. 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) normal discard
B) info cell drops
C) fabric drops
D) hardware input drops

5. Click the Exhibit button.
-- Exhibit -=================== Bootstrap installer starting =================== Initialized the environment Routing engine model is RE-S-1800x4 Discovered that flash disk = ad0 , hard disk = ad1 mount: /dev/ad1s1f : Invalid argument ERROR: mount_partition: Mount /dev/ad1s1a /mnt failed You are now in a debugging subshell (you may not see a prompt)... # -- Exhibit -
During the boot of your MX480, you see the output shown in the exhibit. Which three statements are true? (Choose three.)

A) You must swap the Routing Engine over to the backup slot to get it to boot properly.
B) The Routing Engine cannot mount the partition to complete booting.
C) The boot failed because one of the file systems is in an inconsistent state.
D) Running fsck on the partition might resolve the boot problem.
E) The boot failed because a USB drive has been inserted into the device.

Solutions: