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Juniper JN0-104 Sample Question Answers
Question # 1
What are two important steps when upgrading an SRX300 Series device? (Choose two.)
A. Verify that enough space exists to upload the software package. B. Clear all alarms. C. Reboot the device. D. Verify that the NETCONF protocol is enabled.
Answer: A,C
Explanation: Ref: Installing Software on SRX Series Devices | Junos OS | Juniper
Networks
“…
Example: Installing Junos OS Upgrade Packages on SRX Series Devices
…
Requirements
Before you begin:
• Verify the available space on the internal media.
…
Overview
By default, the request system software add package-name command uses the validate
option to validate the software package against the current configuration as a prerequisite
to adding the software package. This validation ensures that the device can reboot
successfully after the software package is installed. This is the default behavior when you
are adding a software package.
…”
Question # 2
By default, which Junos directory contains the primary syslog file?
A. /var/syslog B. /var/home C. /var/log D. /var/tmp
Answer: C Explanation: Ref: Junos® OS Overview for Junos OS | Juniper Networks Page 23 “… • /var—This directory is located either on the hard drive (device wd2) or internal flash storage. It contains the following subdirectories:
…
• /log—Contains system log and tracing files.
…”
Question # 3
For the interface ge-1/2/3.4, what does "ge" represent?
A. SONET/SDH B. Gigabit Ethernet C Aggregated Ethernet D. GRE
Answer: B
Question # 4
You are asked to configure filter-based forwarding
Which routing-instance type would you use?
A. VRF B. virtual router C. non-forwarding D. forwarding
Answer: D
Question # 5
You suspect a duplicate MAC address on a subnet. You want to display the MAC, errors,
and statistics of the ge-O/0/0 interface.
Which command will accomplish this task?
A. show arp B. show interface ge-O/0/0 extensive C. show ethernet-switching table D. show interface terse
Answer: B
Question # 6
What does the commit check command do?
A. It validates the syntax of a candidate configuration without actually committing the configuration. B. It commits the configuration when a validation check succeeds. C. It schedules the commit to a future time. D. It adds a comment to the messages log.
Answer: A
Explanation: The commit check command allows you to validate the syntax of a candidate
configuration without actually committing the configuration. This is useful for validating the
syntax of a configuration before committing it to ensure that the configuration can be
applied without any errors. According to the Juniper Networks JNCIA-Junos study guide,
the commit check command validates the syntax of a candidate configuration without
actually committing the configuration.
Question # 7
Which two commands will provide the current configuration of the MX1-PE1 BGP group on
your router? (Choose two.)
A. user@router# show groups | display set | match MX1-PE1 B. user@router# show | display set | match MX1-PE1 C. user@router> show configuration | match set | match MX1-PE1 D. user@router> show configuration | dispalv set | match MX1-PE1
Answer: B,D
Question # 8
What is the name of the volume containing the software and files used for the day-to day
operation of a device using Junos with upgraded FreeBSD?
A. /var B. /active C. /junos D. /oam
Answer: C
Question # 9
Which two statements about the Junos OS are true? (Choose two.)
A. It uses a different software source code base for each platform. B. It supports Java for automation on all platforms. C. It supports XML for automation on all platforms. D. It uses the same software source code base for all platforms.
Answer: C,D
Question # 10
You enable unicast reverse path forwarding on the ge-0/0/1.0 interface A packet is
received on the ge-0/0/1.0 interface with a source address of 10.10.10.10. A route lookup
determines that the next hop for the 10.10.10.10 address is the ge-0/0/1.0 interface. In this
scenario which action is performed?
A. The packet is logged B. The packet is forwarded C. The packet is rejected D. The packet is discarded
The PFE receives which two tables from the RE? (Choose two.)
A. Layer 5 forwarding table B. Layer 2 forwarding table C. Layer 3 forwarding table D. Laver 4 forwardina table
Answer: B,C
Question # 12
A device receives a route update for network 172.19.0.0/16 from two different routing information sources.
In this scenario, which parameter will determine the active route?
A. the route learned from the next hop with the highest IP address B. the route learned with the lowest default route preference C. the route learned from the next hop with the lowest IP address D. the route with the lowest metric
Answer: D
Question # 13
Your Junos OS routers use a static route to provide connectivity to the management
network. You do not want this static route to be redistributed using a dynamic routing
protocol.
In this scenario, which static route configuration parameter will accomplish this task?
A. A. no-install B. B. no-retain C. C. no-resolve D. D. no-readvertise
Answer: C
Question # 14
You are troubleshooting a problem on your Junos device. You want to view the syslog
messages in real-time on your terminal. In this scenario, which command will accomplish this task?
A. monitor log messages B. monitor start messages C. show log messages D. show log traceoptions
Answer: B
Explanation: The "monitor start messages" command is used to display syslog messages
in real-time on the terminal. This command provides a convenient way to monitor system
events and troubleshoot problems on the device. The output of this command is sent to the
console and updates in real-time as new syslog messages are generated.
To use this command, you simply enter "monitor start messages" at the CLI prompt and the
syslog messages will be displayed on the terminal. To stop the display, you can press
"Ctrl+C".
Reference: Juniper Networks JNCIA-Junos Study Guide, Section 8.4 "Monitoring System
Log Messages"
Question # 15
Which two statements about login classes are correct? (Choose two.)
A. Login class permissions can be overridden for certain commands. B. Users can be members of multiple login classes. C. Login classes define access privileges for a user. D. There are no system-defined login classes.
Which two protocols use UDP to facilitate speed? (Choose two.)
A. OFTP B. TFTP C. SCP D. SNMP
Answer: B,D
Question # 17
Which statement about the Junos OS forwarding table is correct?
A. The forwarding table consolidates routes from multiple sources. B. The forwarding table is populated with active routes from the routing table C. The forwarding table is responsible for identifying and selecting active routes. D. The forwarding table is only stored on the Routing Engine.
Answer: B Explanation: Ref: Junos OS Routing and Forwarding Tables | Junos OS | Juniper Networks “Junos OS Routing and Forwarding Tables
…
A major function of the Junos OS routing protocol process is to maintain the Routing
Engine’s routing tables and use these tables to determine the active routes to network
destinations. The routing protocol process then installs these routes into the Routing
Engine’s forwarding table.
…”
Question # 18
What are three characteristics of Layer 2 switches? (Choose Three)
A. Layer 2 switches separates multicast domains. B. Layer 2 switches separates collision domains. C. Layer 2 switches forward traffic addressed to hosts that reside on the same collision domain. D. Layer 2 switches forward traffic addressed to hosts that reside on a different collision domain. E. Layer 2 switches forward broadcast traffic. Answer: B,D,E E. Layer 2 switches forward broadcast traffic.
Answer: B,D,E
Question # 19
Which set of IP addresses are in the same subnet?
A. 185.114.16.91/28 and 185.114.16.96/28 B. 185.114.16.77/28 and 185.114.16.82/28 C. 185.114.16.40/28 and 185.114.16.45/28 D. 185.114.16.59/28 and 185.114.16.82/28
Answer: C
Question # 20
Which two statements describe the functions of the Routing Engine (RE)? (Choose two.)
A. The RE will apply filters and routing policies when forwarding the packets to their final destination. B. The RE will calculate the best network path to each individual subnet based on input from various routing protocols and static routes. C. The RE will route or switch packets or frames out of the correct interface as quickly as possible. D. The RE will process management traffic to help monitor and manage the network device.
Answer: B,D
Question # 21
Which statement regarding transit traffic processing is correct?
A. Transit traffic is processed by both the control plane and forwarding plane. B. Transit traffic is only processed by the control plane. C. Transit traffic is only processed by the forwarding plane D. Transit traffic is not processed by the local device.
Answer: C
Question # 22
Which component is responsible for performing protocol updates and system
management?
A. forwarding tables B. Routing Engine C. bridging table D. Packet Forwarding Engine
Which three connection protocols allow you to gather operational information from the
Junos device? (Choose three.)
A. NETCONF B. Telnet C. XML D. JSON E. SSH
Answer: A,B,E
Question # 24
You loaded the factory-default configuration on your Junos device.
Which single element must be configured before a commit command will succeed?
A. An IPv4 address must be configured on the fxpO or emO interface. B. An IPv4 default route must be configured. C. A hostname must be configured. D. A root password must be configured.
Answer: D Explanation: Ref: Root Password | Junos OS | Juniper Networks “Root Password … When the device is powered on for the first time, it is ready to be configured. Initially, you log in as the user root with no password. You must configure a plain-text password for the root-level user (whose username is root) the first time you modify and commit the configuration. …”
Question # 25
What are two benefits of class of service (CoS)? (Choose two.)
A. CoS can increase the performance of a slow network. B. CoS can manage traffic congestion C. CoS can prioritize latency-sensitive traffic D. CoS can increase network bandwidth.
Answer: B,C Explanation: Ref: Benefits of CoS | Junos OS | Juniper Networks “Benefits of CoS … CoS features allow a Juniper Networks device to improve its processing of critical packets
while maintaining best-effort traffic flows, even during periods of congestion.
…
CoS dedicates a guaranteed minimum bandwidth to a particular service class by reducing
forwarding queue delays.
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