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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Layer 3 Routing Troubleshooting | - OSPF and IS-IS troubleshooting
|
| Topic 2: Troubleshooting Methodology and Tools | - Junos operational commands (ping, traceroute, monitor traffic)
|
| Topic 3: Layer 2 and Switching Troubleshooting | - VLAN and bridging issues
|
| Topic 4: VPN and Service Troubleshooting | - IPsec VPN issues
|
| Topic 5: Routing Policy and Firewall Filters | - Policy evaluation and debugging
|
| Topic 6: System Operations and Device Health | - Chassis and hardware status
|
Juniper Junos Troubleshooting Sample Questions:
Question 1
You have configured and successfully committed the configuration for nonstop active routing (NSR). Which command would you use to determine if NSR is operating correctly?
A. Use the show task replication command only on the master Routing Engine.
B. Use the show system synchronization command only on the master Routing Engine.
C. Use the show system synchronization command on the master and the backup Routing Engines.
D. Use the show task replication command on the master and the backup Routing Engines.
Question 2
Which two commands help to identify traffic drops due to oversubscription? (Choose two.)
A. monitor traffic interface
B. monitor interface traffic
C. show interfaces queue
D. show interfaces extensive
Question 3
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. hardware input drops
B. info cell drops
C. normal discard
D. fabric drops
Question 4
Which two statements are true regarding BGP path MTU discovery? (Choose two.)
A. BGP path MTU discovery alleviates fragmentation problems.
B. BGP path MTU discovery provides the most efficient use of link bandwidth.
C. BGP path MTU discovery can be enabled only for IBGP sessions.
D. BGP path MTU discovery must be configured on every router along the path.
Question 5
Click the Exhibit button.
-- Exhibit -
Slot 0 information: State Online Total CPU DRAM ---- CPU less FPC ---Start time 2012-07-07 03:21:00 UTC Uptime 27 minutes, 51 seconds Slot 1 information: State Present Reason --- Hardware Not In Right Slot --Slot 2 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:20:59 UTC Uptime 27 minutes, 52 seconds Slot 3 information: State Present Reason --- Hardware Not Supported --Total CPU DRAM 0 MB Slot 6 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:21:01 UTC Uptime 27 minutes, 50 seconds
-- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)
A. The card in slot 3 is not supported by the chassis.
B. The Control Board in slot 6 is online and working.
C. The Flexible PIC Concentrator (FPC) in slot 1 is not installed properly for this chassis.
D. The Control Board in slot 0 has a missing CPU.
E. The Flexible PIC Concentrator (FPC) in slot 6 is online and working.
Solutions:
| Question 1 Answer: D | Question 2 Answer: C,D | Question 3 Answer: A | Question 4 Answer: A,B | Question 5 Answer: A,C,E |
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