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Juniper Junos Troubleshooting Sample Questions:

1. Which operational CLI command would you use to troubleshoot hardware-related problems?

A) show cli
B) show route
C) show system
D) show chassis

2. Given the example shown below:
Emergency boot media > flash disk > _____
What is missing from the default boot list?

A) PCMCIA card
B) LAN
C) USB
D) hard disk

3. You suspect that your router is missing the .0/24 routes for your local network. You first want to look for the routes on the control plane before troubleshooting the data plane.
Which operational mode command should you issue?

A) show arp
B) show route
C) show route forwarding-table
D) show route flow validation table

4. Which three steps are involved in troubleshooting any problem? (Choose three.)

A) Reboot the device.
B) Determine who made the changes.
C) Clearly define the problem.
D) Outline the expected behavior.
E) Isolate the problem.

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

Solutions: