Junos Troubleshooting (JN0-691) Free Practice Test

Question 1

What is a common cause for an OSPF peering session stuck in Exstart?

A. incorrect authentication

B. MTU mismatch

C. identical router IDs

D. subnet mismatch

Correct Answer: B

Question 2

Which CLI command is used to restart a software process?

A. commit

B. reload

C. reboot

D. restart

Correct Answer: C

Question 3

An engineer upgraded a router to an incorrect version of the Junos OS and performed the system snapshot function.
Which two actions would return the system to the original version? (Choose two.)

A. Reboot the router using the primary media and perform a system snapshot.

B. Rollback the Junos OS version and perform a system snapshot.

C. Reboot the router using the secondary media and perform a system snapshot.

D. Downgrade to the correct Junos OS version and perform a system snapshot.

Correct Answer: C,D

Question 4

-- Exhibit --
[edit]
user@R1# run show interfaces ge-1/1/2 terse
Interface Admin Link Proto Local Remote
ge-1/1/2 up up
ge-1/1/2.0 up up aenet --> ae0.0
[edit]
user@R1# run show interfaces ge-1/1/3 terse
Interface Admin Link Proto Local Remote
ge-1/1/3 up up
ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R1# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R1# show interfaces ae0
aggregated-ether-options {
lacp {
periodic slow;
system-priority 200;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
**************************************************************************
[edit]
user@R2# run show interfaces ge-1/1/2 terse
Interface Admin Link Proto Local Remote
ge-1/1/2 up up
ge-1/1/2.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ge-1/1/3 terse
Interface Admin Link Proto Local Remote
ge-1/1/3 up up
ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R2# show interfaces ae0
aggregated-ether-options {
lacp {
periodic fast;
system-priority 100;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
-- Exhibit --
You have configured a LAG and are now enabling LACP on the ae0 interface. You have configured and committed the configuration as shown in the exhibit. However, the exhibit also shows that the ae0 interface is now in the up/down state.
What must you do to resolve this problem?

A. Configure R2's LACP configuration as passive.

B. Configure R1's LACP configuration as active.

C. Configure both routers' ae0 LACP configuration to periodic fast.

D. Change the LACP system-priority of R1 to 300.

Correct Answer: B

Question 5

Click the Exhibit button.
-- Exhibit -
May 20 22:27:04.010297 OSPF rcvd Hello 192.168.0.2 -> 224.0.0.5 (ge-1/1/2.0 IFL 343
area 0.0.0.0)
May 20 22:27:04.010320 Version 2, length 44, ID 10.10.10.1, area 0.0.0.1
May 20 22:27:04.010342 checksum 0x166d, authtype 0
May 20 22:27:04.010365 mask 255.255.255.252, hello_ivl 10, opts 0x12, prio 128
May 20 22:27:04.010387 dead_ivl 40, DR 192.168.0.2, BDR 0.0.0.0
May 20 22:27:07.891698 OSPF periodic xmit from 192.168.0.1 to 224.0.0.5 (IFL
2684276180 area 0.0.0.0)
May 20 22:27:12.749988 OSPF packet ignored:area mismatch (0.0.0.1) from 192.168.0.2 on intf ge-1/1/2.0 area 0.0.0.0 May 20 22:27:12.750071 OSPF rcvd Hello 192.168.0.2 -> 224.0.0.5 (ge-1/1/2.0 IFL 343
area 0.0.0.0) May 20 22:27:12.750095 Version 2, length 44, ID 10.10.10.1, area 0.0.0.1 May 20 22:27:12.750116 checksum 0x166d, authtype 0 May 20 22:27:12.750139 mask 255.255.255.252, hello_ivl 10, opts 0x12, prio 128 May 20 22:27:12.750161 dead_ivl 40, DR 192.168.0.2, BDR 0.0.0.0 May 20 22:27:14.393182 OSPF rcvd Hello 192.168.0.2 -> 224.0.0.5 (ge-1/1/2.0 IFL 343
area 0.0.0.0) May 20 22:27:14.393262 Version 2, length 44, ID 10.10.10.1, area 0.0.0.0 May 20 22:27:14.393284 checksum 0x0, authtype 0 May 20 22:27:14.393307 mask 255.255.255.252, hello_ivl 50, opts 0x12, prio 128 May 20 22:27:14.393368 dead_ivl 200, DR 0.0.0.0, BDR 0.0.0.0 May 20 22:27:14.393399 OSPF packet ignored:our router ID received from 192.168.0.2 on
intf ge-1/1/2.0 area 0.0.0.0 -- Exhibit -
Referring to the exhibit, which two OSPF adjacency problems are present? (Choose two.)

A. hello interval mismatch

B. area number mismatch

C. duplicate router ID

D. area type mismatch

Correct Answer: B,C

Question 6

Click the Exhibit button.
-- Exhibit --
user@R1> show configuration interfaces lo0
unit 5 {
family inet {
filter {
input JUNOS;
}
address 5.5.5.5/32;
}
}
user@R1> show configuration firewall family inet filter JUNOS
term term1 {
from {
protocol tcp;
port [ telnet ftp ftp-data snmp ssh syslog http tacacs 64644 1024-65535 ];
}
then {
log;
accept;
}
}
term default {
then {
discard;
}
}
-- Exhibit --
Referring to the exhibit, which three statements are true? (Choose three.)

A. R1 will drop all non-TCP transit traffic.

B. R1 will drop all BGP packets.

C. R1 will drop all OSPF packets.

D. R1 will accept telnet traffic.

E. R1 will drop all traffic with destination address 5.5.5.5.

Correct Answer: B,C,D

Question 7

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;
}

Correct Answer: B

Question 8

Which three commands will provide details about CPU utilization on a line card? (Choose three.)

A. request pfe execute target fpc1 command "show thread"

B. request pfe execute target fpc1 command "show sched"

C. show chassis hardware

D. request pfe execute target fpc1 command "show arp"

E. show chassis fpc

Correct Answer: A,B,E

Question 9

Click the Exhibit button.
-- Exhibit -user@router> show system users 9:28PM up 2 days, 3:02, 2 users, load averages: 0.06, 0.13, 0.09 USER TTY FROM LOGIN@ IDLE WHAT lab u0 - 9:13PM - -cli (cli) admin p0 10.210.15.30 9:45PM - -cli (cli) -- Exhibit -
Referring to the exhibit, which two statements are true? (Choose two.)

A. Both user sessions will be cleared after issuing the command request system logout terminal.

B. The admin user is connected through a Telnet or SSH session.

C. The lab user's session will be cleared after issuing the command request system logout user lab.

D. The admin user is connected through a console session.

Correct Answer: B,C

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Juniper Junos Troubleshooting (JN0-691) Free Practice Test