JN0-690 Online Practice Questions and Answers

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

A. Reboot the device.

B. Clearly define the problem.

C. Outline the expected behavior.

D. Determine who made the changes.

E. Isolate the problem.

Which two Junos OS commands are helpful in confirming whether an Object Identifier (OID) has recorded the correct data? (Choose two.)

A. show snmp mib get

B. show snmp statistics

C. show snmp v3

D. show snmp mib walk

Given the example shown below:

Emergency boot media > flash disk > _____

What is missing from the default boot list?

A. LAN

B. USB

C. PCMCIA card

D. hard disk

What controls the CLI process?

A. chassis control daemon

B. management daemon

C. routing protocol process

D. device control daemon

Which three statements are correct about ARP related troubleshooting? (Choose three.)

A. Most devices that run the Junos OS allow you to specify a manual ARP entry.

B. The monitor traffic interface command can be used to watch ARP packets.

C. There are no default ARP policers on any devices running the Junos OS.

D. An individual ARP entry can be cleared using the clear arp hostname command.

E. The clear arp command also clears the IPv6 neighbor cache.

You are asked to provide an audit trail for all user activity on your Junos device. Which syslog configuration statement accomplishes this task?

A. user * {any any;}file messages {any notice;authorization info;}

B. user * {any any;}file messages {any info;authorization info;}

C. user * {any emergency;}file messages {any notice;authorization info;}file interactive-commands {interactive-commands any;}

D. user * {any emergency;}file messages {any notice;authorization info;}file audit-commands {authorization any;}

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

A. [edit routing-options]user@router# show traceoptions {file rpd_log;flag general;}

B. [edit routing-instances]user@router# show traceoptions {file rpd_log;flag general;}

C. [edit forwarding-options]user@router# show traceoptions {file rpd_log;flag general;}

D. [edit protocols]user@router# show traceoptions {file rpd_log;flag general;}

Two neighboring routers running OSPF were configured with the same router ID by mistake. Which OSPF operational mode command would report the number of hello packets received with the local router's router ID?

A. show ospf route

B. show ospf log

C. show ospf statistics

D. show ospf io-statistics

Click the Exhibit button.

-- Exhibit -user@router> show chassis environment

Class Item Status Measurement Power Power Supply A OK Power Supply B Absent Temp FPC 0 OK 28 degrees C / 82 degrees F FPC 1 OK 27 degrees C / 80 degrees F Power Supply A OK 22 degrees C / 71 degrees F Power Supply B Absent SSB 0 OK 30 degrees C / 86 degrees F Backplane OK 22 degrees C / 71 degrees F Routing Engine 0 OK 26 degrees C / 78 degrees F Routing Engine 1 Testing Fans Rear Fan OK Spinning at normal speed Front Upper Fan OK Spinning at normal speed Front Middle Fan OK Spinning at normal speed Front Bottom Fan OK Spinning at normal speed Misc Craft Interface OK -- Exhibit -

Referring to the exhibit, which two statements are true about the chassis? (Choose two.)

A. Power Supply B is not installed in the system.

B. Power Supply B is installed in the system but has failed.

C. Routing Engine 1 has failed.

D. Routing Engine 1 is installed in the system but is still initializing.

Click the Exhibit button.

-- Exhibit -user@host > show chassis craft-interface

Front Panel System LEDs: Routing Engine 0 1

OK * . Fail . * Master * .

Front Panel Alarm Indicators:

Red LED . Yellow LED * Major relay . Minor relay *

Front Panel FPC LEDs: FPC 0 1 2 3 4 5 6 7 8 9

Red . . . . . . . . . . Green * * . . . . . . * *

CB LEDs: CB 0 1

Amber . .

Green * *

PS LEDs:

PS 0 1 2 3 4 5 6 7 8

Red . . . . . . . . . Green . . . . * * * * *

Fan Tray LEDs: FT 0 1 2 3 Red . . . . Green * * * *

Front Panel SFB LEDs: SFB 0 1 2 3 4 5 6 7

Red . . . . . . . . Green * * * * * * * *

Front Panel Chassis Info: Chassis Number 0x0 Chassis Role S -- Exhibit -

Referring to the exhibit, which statement is true?

A. Routing Engine 1 is OK, the red LED is lit, and the major alarm relay is on.

B. Routing Engine 1 has failed, yellow LED is lit, and the minor alarm relay is on.

C. Routing Engine 1 is OK, the red LED is lit, and the minor alarm relay is on.

D. Routing Engine 1 has failed, yellow LED is lit, and the major alarm relay is on.

Click the Exhibit button. -- Exhibit -user@R1> show route 2.2.2.2

user@R1> show route forwarding-table destination 2.2.2.2

Routing table: default.inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 2.2.2.2/32 user 1 17.1.1.2 ucst 642 9 xe-1/1/0.0

-- Exhibit -

Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

A. R1 will discard the packet.

B. R1 will forward the packet.

C. R1 will redirect the packet to the Routing Engine.

D. R1 will reject the packet.

Click the Exhibit button. -- Exhibit -user@R1> show route forwarding-table destination 2.2.2.2

user@R1> show route 2.2.2.2

inet.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both

2.2.2.2/32 *[OSPF/10] 2w3d 22:19:41, metric 1 > to 17.1.1.2 via xe-1/1/0.0

-- Exhibit -

Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

A. R1 will discard the packet.

B. R1 will forward the packet.

C. R1 will redirect the packet to the Routing Engine.

D. R1 will reject the packet.

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 traffic with destination address 5.5.5.5.

B. R1 will drop all OSPF packets.

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

D. R1 will accept telnet traffic.

E. R1 will drop all BGP packets.

-- Exhibit -user@router> show system switchover Graceful switchover: On Configuration databasE. Ready Kernel databasE. Version incompatible Peer statE. Steady State -- Exhibit -

You have enabled graceful Routing Engine switchover (GRES). During verification, you switched mastership and all interfaces went down.

Referring to the output shown in the exhibit, why did the interfaces go down?

A. The synchronization failed because the Junos OS version on the backup is incompatible with the version running on the master.

B. The synchronization failed because the Junos OS version on the backup does not support GRES.

C. The synchronization failed because the Routing Engine models are different between the master and backup.

D. The synchronization failed because the master Routing Engine cannot communicate with the backup Routing Engine.

-- Exhibit -

[edit]

user@router# show interfaces

ge-1/1/2 {

gigether-options {

802.3ad ae0;

}

}

ge-1/1/3 {

gigether-options {

802.3ad ae0;

}

}

ae0 {

unit 0 {

family bridge {

interface-mode trunk;

vlan-id-list 100;

}

}

}

-- Exhibit -

You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:

[edit] user@router# run show interfaces ae0 error: device ae0 not found

Which command would you use to resolve this problem?

A. set interfaces ae0 aggregated-ether-options lacp active

B. set chassis alarm ethernet link-down ignore

C. set chassis network-services ethernet

D. set chassis aggregated-devices ethernet device-count 1