Deck 1: Junos, Associate (JNCIA-Junos)

Question 1

You are connected to your Junos device using an SSH connection to the fxp0 interface. No other interfaces are currently configured beyond their default settings. You commit a configuration that makes the fxp0 interface unreachable from your management network. In this scenario, how would you re-establish communication with the device?

A) Connect to the console of the device.
B) Establish an SSH connection to the loopback interface.
C) Power off and power on the device.
D) Unplug the network cable and plug it back in.

Answer 1

Connect to the console of the device.

Question 2

Referring to the exhibit, which logical interface is able to forward IP traffic?

A) ge-0/0/2.0
B) ge-0/0/0
C) ge-0/0/1.0
D) ge-0/0/2

Answer 2

ge-0/0/1.0

Question 3

When multiple users are editing the configuration on a Junos device, what is the default behavior when a user issues a commit command?

A) All valid configuration changes made by all users will take effect.
B) The user's configuration changes are committed; other users' configuration changes are still pending.
C) The user will receive an error message disallowing a commit of the configuration.
D) The user's configuration changes are committed; other users will be exited from configuration mode.

Answer 3

All valid configuration changes made by all users will take effect.

Question 4

You are considering an upgrade from 19.1R1 and want to ensure that only bug fixes are included. Which two software versions should you consider in this situation? (Choose two.)

A) 19.3R1-S1
B) 19.3R2
C) 19.1R3
D) 19.1R1-S2

Question 5

Which two statements describe IPv4 default behavior for BGP? (Choose two.)

A) All active BGP routes are exported to configured EBGP neighbors.
B) All BGP routes are exported to configured EBGP neighbors.
C) All BGP routes are imported into the inet4.0 routing table.
D) All BGP routes are imported into the inet.0 routing table.

Question 6

What are two modes of unicast reverse path forwarding? (Choose two.)

A) strict
B) high
C) low
D) loose

Question 7

You notice that the terms in your firewall filter are not in the correct order. What would solve this problem?

A) Use the next term action to force an evaluation of the next term. Use the next term action to force an evaluation of the next term.
B) Use the insert command to reorder the terms within the filter. insert command to reorder the terms within the filter.
C) Use the count parameter to ensure that the terms are evaluated correctly. count parameter to ensure that the terms are evaluated correctly.
D) Use the reject action to change the action of the filter. reject action to change the action of the filter.

Question 8

Which two statements describe PFE functions? (Choose two.)

A) The PFE stores a local copy of the Layer 2 and Layer 3 forwarding tables.
B) The PFE provides access to the CLI and J-Web.
C) The PFE stores the master copy of the Layer 2 and Layer 3 forwarding tables.
D) The PFE implements rate limiting using policers.

Question 9

Which command displays all IPv4 routes in the default routing instance?

A) show route table inet.1
B) show route table inet6.0
C) show route table inet.2
D) show route table inet.0

Question 10

What are two services performed by the Packet Forwarding Engine? (Choose two.)

A) to process transit traffic
B) to handle processes that control the device's interfaces
C) to maintain the routing tables
D) to implement stateless firewall filtering

Question 11

Which command will show files stored in the /var/home/lab directory?

A) lab@router> file show
B) lab@router> file list
C) [edit] lab@router# rollback ? [edit]
D) lab@router> ls

Question 12

Which two statements are true regarding dynamic routing? (Choose two.)

A) Participating devices dynamically learn routing information from each other.
B) Dynamic routing requires more administrative overhead than static routing.
C) Dynamic routing allows a device to automatically reroute traffic around a failure.
D) Dynamic routing is used when absolute control of routing parameters is necessary.

Question 13

Which statement is true about the orlonger route-filter match type?

A) All routes within the specified prefix that are longer than or equal to the given prefix are considered a match.
B) All routes within the specified prefix that are longer or equal to the given prefix up to a defined acceptable prefix length are considered a match.
C) All routes within the specified prefix that are longer than the given prefix up to a defined acceptable prefix length are considered a match.
D) All routes within the specified prefix that are longer than the given prefix are considered a match.

Question 14

What are two benefits realized by the disaggregated Junos OS? (Choose two.)

A) There is increased flexibility to use different control plane versions.
B) The Junos VM becomes hardware-independent and can be deployed on any hypervisor without modification.
C) The architecture facilitates programmability through provisioning the control plane, the data path, and the platform APIs.
D) The platform drivers and forwarding engine are removed from the control plane to increase performance.

Question 15

Referring to the exhibit, which parameter at the end of the command would provide information for troubleshooting purposes?

A) no-timestamp
B) extensive
C) print-ascii
D) no-resolve

Question 16

Which command verifies configuration syntax without applying the changes?

A) commit confirmed
B) commit check
C) commit comment
D) commit and-quit

Question 17

What is the purpose of the discard action of a firewall filter?

A) The system silently drops the packet.
B) The system evaluates the next term in the policy.
C) The system drops the packet and logs the entry.
D) The system drops the packet and sends an ICMP message.

Question 18

By default, which character indicates the UNIX shell prompt?

A) #
B) %
C) $
D) >

Question 19

Which two commands would you use to reset the candidate configuration to the active configuration? (Choose two.)

A) rollback 0
B) rollback 2
C) rollback 1
D) rollback

Question 20

Referring to the exhibit, which command will cause this event message?

A) request system halt
B) request system logout
C) request system recover
D) request system commit

Question 21

When a system process encounters an error, how does the Junos OS protect other processes from being impacted?

A) Each process operates in its own shared memory space.
B) The Junos OS executes only one process at a time.
C) Each routing protocol runs as an individual process.
D) The Junos OS executes multiple processes simultaneously.

Question 22

You configured the route filter shown in the exhibit. In this scenario, which IP addresses would term-One accept?

A) IP addresses that are part of the 172.35.0.0/16 network only.
B) IP addresses that are part of the 172.35.0.0/16 network and IP addresses that are in the 172.35.0.0/16 and 172.36.0.0/16 subnets.
C) IP addresses that are in a subnet of 172.35.0.0/16 network, but not IP addresses that are part of the 172.35.0.0/16 network itself.
D) IP addresses that are part of the 172.35.0.0/16 network and IP addresses that are in subnets of 172.35.0.0/16 network.

Question 23

Which next-hop interface will be used to reach the 10.21.14.16 destination as shown in the exhibit?

A) ge-0/0/0.0
B) ge-0/0/2.0
C) ge-0/0/1.0
D) ge-0/0/3.0

Question 24

What is responsible for processing multicast transit traffic?

A) control plane
B) management plane
C) RE
D) PFE

Question 25

What are three functions of the RE? (Choose three.)

A) to monitor the chassis
B) to maintain the forwarding tables
C) to implement policing
D) to enforce stateless firewall filters
E) to manage the PFE

Question 26

Referring to the exhibit, what does the number inside the square brackets represent?

A) route preference
B) metric
C) protocol reference number
D) local preference

Question 27

Which account is used to access a Junos device in a factory-default configuration?

A) root
B) admin
C) lab
D) juniper

Question 28

What is an "X" release of the Junos OS?

A) a standard feature release
B) a feature velocity release
C) a special feature release
D) a feature beta release

Question 29

Which parameter would you use to prohibit the redistribution of a static route used for management traffic?

A) discard
B) passive
C) reject
D) no-readvertise

Question 30

Which two conditions must exist in a Junos device for traffic to transit the device to a specific destination? (Choose two.)

A) A routing table entry for that destination must exist.
B) A firewall filter must exist to allow traffic to reach that destination.
C) A forwarding table entry for that destination must exist.
D) A routing policy must be in place on the device.

Question 31

Which two keystrokes are used to auto-complete commands? (Choose two.)

A) Esc
B) Spacebar
C) Tab
D) End

Question 32

What information would you find using the CLI help function? (Choose two.)

A) Junos technical publications
B) explanation of traceoption events
C) tip for the day
D) explanation of specific system log error messages

Question 33

Referring to the exhibit, which command was issued to generate the output?

A) show chassis environment
B) show chassis hardware
C) show chassis routing-engine
D) show chassis fpc

Question 34

Referring to the exhibit, which statement is correct when traffic is received from 10.10.10.4?

A) The traffic is counted and rejected.
B) The traffic is only accepted.
C) The traffic is counted and accepted.
D) The traffic is only rejected.

Question 35

Which keystroke is used to auto-complete user-defined variables?

A) End
B) Spacebar
C) Tab
D) Home

Question 36

Referring to the exhibit, which two statements are correct? (Choose two.)

A) The memory utilization is 28%.
B) The memory utilization is 72%.
C) The 15 minute CPU load average is 99%.
D) The CPU kernel utilization is 1%.

Question 37

What does the output of the show route forwarding-table command display?

A) the Packet Forwarding Engine's routing table
B) the inactive entries in the Routing Engine's routing table
C) the routing protocol databases in the Routing Engine
D) the Routing Engine's forwarding table

Question 38

Which configuration parameter on a Junos device modifies the default next-hop resolution behavior of a static route?

A) resolve
B) no-readvertise
C) passive
D) preference

Question 39

Which command displays the output shown in the exhibit?

A) show chassis hardware
B) show chassis temperature-thresholds
C) show chassis alarms
D) show chassis environment

Question 40

Referring to the exhibit, what is the expected behavior for login attempts from users that receive a reject form from both the RADIUS and TACACS+ servers?

A) Users are prompted for a local authentication password.
B) Users are not prompted for a local authentication password.
C) Users are prompted for the root authentication password.
D) Users are granted limited access to the device using a guest account.

Question 41

Which three statements describe OSPF? (Choose three.)

A) OSPF uses a distance-vector algorithm to calculate routing cost.
B) OSPF calculates the best path to each destination.
C) OSPF is a link-state IGP.
D) OSPF must operate between different autonomous systems.
E) OSPF uses areas to incorporate hierarchy and to allow for scalability.

Question 42

You are considering an upgrade from 19.1R1 and want to ensure that only bug fixes are included. Which two software versions should you consider in this situation? (Choose two.)

A) 19.3R1-S1
B) 19.3R2
C) 19.1R3
D) 19.1R1-S2

Question 43

By default, which character indicates the UNIX shell prompt?

A) #
B) %
C) $
D) >

Question 44

What would you use as a network tool to open a secure terminal connection from a device running Junos OS to another device?

A) SSH
B) HTTPS
C) RDP
D) telnet

Question 45

Which two statements describe a routing policy? (Choose two.)

A) Attribute changes applied to export policies always affect the local routing table.
B) Routing policies are used to choose which routes are sent to neighbors using dynamic routing protocols.
C) Active and inactive routes are available for export from the routing table.
D) A routing policy allows you to control the flow of information into the routing table.

Question 46

A Junos device is in a factory-default configuration and no host name is set. What is used in place of a host name in this scenario?

A) router
B) amnesiac
C) Junos
D) user

Question 47

While working on a Junos device, you receive the message shown in the exhibit. In this scenario, what should you do to stop the shutdown process?

A) Issue the request system power-off in 0 command. Issue the request system power-off in 0 command.
B) Issue the clear system commit command. clear system commit
C) Issue the request system halt in 0 command. request system halt in 0
D) Issue the clear system reboot command. clear system reboot

Question 48

Referring to the exhibit, what will be the result?

A) The device will boot in single-user mode at the operational prompt.
B) The device will boot in multi-user mode at the configuration prompt.
C) The device will boot into single-user mode at the shell prompt.
D) The device will boot into multi-user mode at the shell prompt.

Question 49

What is the default location of the primary syslog file on Junos devices?

A) /var/log/
B) /var/tmp/
C) /var/home/
D) /var/db/

Question 50

A Junos device is configured with multiple routing protocols to the same destination prefix. By default, which route will be active in the forwarding table?

A) an OSPF route
B) an IS-IS route
C) a BGP route
D) a static route

Question 51

Referring to the exhibit, which command will change the 172.16.10.1/24 IP address to 172.16.100.1/24 IP address?

A) copy interfaces ge-0/0/2 unit 0 family inet address 172.16.10.1/24 to address 172.16.100.1/24
B) rename interfaces ge-0/0/2 unit 0 family inet address 172.16.10.1/24 to address 172.16.100.1/24
C) set interfaces ge-0/0/2 unit 0 family inet address 172.16.100.1/24
D) insert interfaces ge-0/0/2 unit 0 family inet address 172.16.10.1/24 before address 172.16.100.1/24

Question 52

Referring to the exhibit, which statement is true?

A) Traps are sent to 10.21.15.180.
B) Traps are allowed from 10.21.15.180.
C) Traps are sent to 10.21.15.16.
D) Traps are allowed from 10.21.15.16.

Question 53

How would you change the display so that 40 lines will be displayed in the terminal program when you are logged into a Junos device?

A) Issue the set cli screen-length 40 command from operational mode. Issue the set cli screen-length 40 command from operational mode.
B) Set the display options in your terminal program.
C) Issue the set cli screen-length 40 command from configuration mode. command from configuration mode.
D) Set the window size of your terminal program.

Question 54

In which directory are traceoption files stored by default?

A) /var/tmp/
B) /var/log/
C) /var/db/
D) /var/home/

Question 55

You have entered the command show log messages | match "error|kernel|panic" . Which statement is correct regarding the keywords error , kernel , and panic in the output?

A) The output will contain all messages from the file except the ones that contain at least one of the three defined keywords.
B) The output will contain all messages from the file that contain at least one of the three defined keywords.
C) The output will contain all messages from the file except the ones that contain all three defined keywords.
D) The output will contain all messages from the file that contain all three defined keywords.

Question 56

Which command verifies configuration syntax without applying the changes?

A) commit confirmed
B) commit check
C) commit comment
D) commit and-quit

Question 57

Given the configuration shown below: set system authentication-order [ tacplus ] Which two statements are correct? (Choose two.)

A) If the TACACS+ server is not available, the local user database is checked.
B) If the TACACS+ server is available and rejects the username/password provided, the user is not allowed to access the device.
C) If the TACACS+ server is not available, the user is not allowed to access the device.
D) If the TACACS+ server is available and rejects the username/password provided, the local password database is checked.

Question 58

Which command produced the output shown in the exhibit?

A) show interfaces filters
B) show interfaces terse
C) show interfaces summary
D) show interfaces extensive

Question 59

Which command is used to load the rescue configuration?

A) load replace rescue
B) load merge rescue
C) rollback rescue
D) rollback

Question 60

Which statement is true about the longer route-filter match type?

A) All routes within the specified prefix that are longer than or equal to the given prefix are considered a match.
B) All routes within the specified prefix that are longer or equal to the given prefix up to a defined acceptable prefix length are considered a match.
C) All routes within the specified prefix that are longer than the given prefix up to a defined acceptable prefix length are considered a match.
D) All routes within the specified prefix that are longer than the given prefix are considered a match.

Question 61

You are connected to your Junos device using an SSH connection to the fxp0 interface. No other interfaces are currently configured beyond their default settings. You commit a configuration that makes the fxp0 interface unreachable from your management network. In this scenario, how would you re-establish communication with the device?

A) Connect to the console of the device.
B) Establish an SSH connection to the loopback interface.
C) Power off and power on the device.
D) Unplug the network cable and plug it back in.

Question 62

Depending on the device type, Junos is built upon which two OS kernels? (Choose two.)

A) NetBSD
B) FreeBSD
C) Linux
D) OpenBSD

Question 63

You notice that the terms in your firewall filter are not in the correct order. What would solve this problem?

A) Use the next term action to force an evaluation of the next term. Use the next term action to force an evaluation of the next term.
B) Use the insert command to reorder the terms within the filter. insert command to reorder the terms within the filter.
C) Use the count parameter to ensure that the terms are evaluated correctly. count parameter to ensure that the terms are evaluated correctly.
D) Use the reject action to change the action of the filter. reject action to change the action of the filter.

Question 64

Referring to the exhibit, what information is provided about the route to 192.168.47.0/24? (Choose two.)

A) There are two active routes to 192.168.47.0/24.
B) There is a single active route to 192.168.47.0/24.
C) There are two next hops available to 192.168.47.0/24.
D) There is a single next hop available to 192.168.47.0/24.

Question 65

Referring to the exhibit, which dynamic routing protocol would be used for this topology?

A) IGMPv3
B) RIPng
C) RIP
D) OSPFv2

Question 66

Which command will show files stored in the /var/home/lab directory?

A) lab@router> file show
B) lab@router> file list
C) [edit] lab@router# rollback ? [edit]
D) lab@router> ls

Question 67

When multiple users are editing the configuration on a Junos device, what is the default behavior when a user issues a commit command?

A) All valid configuration changes made by all users will take effect.
B) The user's configuration changes are committed; other users' configuration changes are still pending.
C) The user will receive an error message disallowing a commit of the configuration.
D) The user's configuration changes are committed; other users will be exited from configuration mode.

Question 68

Routing policies contain which two types of statements? (Choose two.)

A) then
B) from
C) default
D) and

Question 69

What are two configurable physical interface properties? (Choose two.)

A) protocol family
B) address
C) MTU
D) link mode

Question 70

Referring to the exhibit, which command will cause this event message?

A) request system halt
B) request system logout
C) request system recover
D) request system commit

Question 71

How does the PFE determine how to forward transit traffic?

A) The PFE determines network destinations itself based on the RE's routing table.
B) The PFE uses the forwarding table provided by the RE.
C) The PFE performs a destination lookup based on its own routing table.
D) The PFE uses the routing table provided by the RE.

Question 72

Which two statements are true about the default behavior of Junos routing policies? (Choose two.)

A) Routing policies control the flow of routing information going to and from the forwarding table.
B) Routing policies control the flow of routing information going to and from the routing table.
C) Routing policies can export active and inactive routes.
D) Routing policies can export only active routes.

Question 73

What is the purpose of the load merge command?

A) to look for a replace tag in the configuration you load
B) to combine the current configuration with the configuration you load
C) to add or delete variables from the configuration based on the contents of a specified patch file
D) to completely overwrite the current configuration with the configuration you load

Question 74

Which statement is true about the orlonger route-filter match type?

A) All routes within the specified prefix that are longer than or equal to the given prefix are considered a match.
B) All routes within the specified prefix that are longer or equal to the given prefix up to a defined acceptable prefix length are considered a match.
C) All routes within the specified prefix that are longer than the given prefix up to a defined acceptable prefix length are considered a match.
D) All routes within the specified prefix that are longer than the given prefix are considered a match.

Question 75

Which command displays all IPv4 routes in the default routing instance?

A) show route table inet.1
B) show route table inet6.0
C) show route table inet.2
D) show route table inet.0

Question 76

Which two features are implemented on the Packet Forwarding Engine? (Choose two.)

A) firewall filters
B) chassis management
C) class of service
D) routing protocol updates

Question 77

Which two statements describe PFE functions? (Choose two.)

A) The PFE stores a local copy of the Layer 2 and Layer 3 forwarding tables.
B) The PFE provides access to the CLI and J-Web.
C) The PFE stores the master copy of the Layer 2 and Layer 3 forwarding tables.
D) The PFE implements rate limiting using policers.

Question 78

What are two services performed by the Packet Forwarding Engine? (Choose two.)

A) to process transit traffic
B) to handle processes that control the device's interfaces
C) to maintain the routing tables
D) to implement stateless firewall filtering

Question 79

Which two commands would you use to reset the candidate configuration to the active configuration? (Choose two.)

A) rollback 0
B) rollback 2
C) rollback 1
D) rollback

Question 80

Which parameter of the monitor traffic command should be used with caution when considering storage space on a Junos device?

A) write-file
B) layer2-headers
C) extensive
D) detail