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Juniper JN0-105 Sample Question Answers
Question # 1
What are two benefits when implementing class of service? (Choose two.)
A. Traffic congestion will be eliminated. B. The network will be faster. C. Traffic congestion can be managed. D. Latency-sensitive traffic can be prioritized.
Answer: C
Explanation: Class of Service (CoS) in Junos OS provides tools for managing traffic
congestion and ensuring that latency-sensitive traffic is given priority over less time-critical
data. By implementing CoS, network administrators can classify traffic into different priority
levels, apply scheduling policies to ensure that high-priority traffic is transmitted first, and
use congestion management techniques such as queue buffers and drop profiles. This
helps in maintaining the quality of service for critical applications, especially during periods
of high network congestion. However, CoS does not eliminate congestion entirely nor does
it inherently make the network faster; it provides a mechanism for better managing and
controlling traffic flows according to their importance and time sensitivity.
Question # 2
What are two physical interface properties? (Choose two.)
A. MAC address B. IP address C. routing protocols D. MTU
Answer: A,D
Explanation: Two physical interface properties in Junos OS include the MAC address (A)
and the Maximum Transmission Unit (MTU) size (D). The MAC address is a hardware
identifier for the network interface, while the MTU size determines the largest packet size
that the interface can transmit without needing to fragment the packet.
Question # 3
You have configured some interfaces on a Junos device; however, you have not yetcommitted the configuration.What happens if you issue the rollback 0 command in this scenario?
A. The messages.log file is deleted. B. The factory default configuration is loaded. C. The Junos device is rebooted. D. The interface changes you made are discarded.
Answer: D
Explanation:
Issuing the rollback 0 command in Junos OS will discard any uncommitted changes and
revert to the last committed configuration. This command effectively cancels any
configuration changes that have been made but not yet committed, ensuring that the
device returns to its previous stable state.
References:
"rollback 0 ...................................(rolls back the changes just made )" from Useful
Juniper Commands.txt.
Juniper official documentation: Rolling Back a Configuration.
Question # 4
You are configuring a firewall filter on a Juniper device.In this scenario, what are two valid terminating actions? (Choose two.)
A. 1 count B. 2discarD C. 3next term D. 4accept
Answer: B,D
Explanation: In Juniper firewall filter configurations, "discard" and "accept" are two valid
terminating actions for a term within a filter. The "discard" action drops the packet,
preventing it from reaching its intended destination, while the "accept" action allows the
packet to pass through the filter, proceeding to its next hop or destination. "Count" is a nonterminating
action that increments a counter every time a packet matches the term but
does not inherently determine the packet's fate. "Next term" directs the evaluation to
proceed to the next term in the filter for further processing, also a non-terminating action.
Question # 5
What is the protocol data unit (PDU) of the Data Link Layer?
A. segment B. byte C. frame D. bit
Answer: C
Explanation: In the OSI model, the Data Link Layer is responsible for node-to-node
delivery of data. It frames the packets received from the Network Layer and prepares them
for physical transmission. The Protocol Data Unit (PDU) for the Data Link Layer is called a
"frame." Frames encapsulate the network layer packets, adding a header and a trailer that
include the hardware addresses of the source and destination, among other things,
facilitating the data link layer services like frame synchronization, flow control, and error
checking.
Question # 6
Which two statements are correct about a Routing Engine? (Choose two.)
A. It processes CoS marked traffic. B. It forwards transit traffic. C. It processes management traffic. D. It maintains routing tables.
Answer: C,D
Explanation: The Routing Engine (RE) in Juniper Networks devices plays a pivotal role in
the control plane, handling tasks that are critical for the operation and management of the
network. One of its key functions is processing management traffic, which includes user
commands, system configuration, and monitoring operations. The RE also maintains
routing tables, which are essential for network routing decisions. These tables contain
network topology information and routing paths, which the RE uses to update the Packet
Forwarding Engine (PFE) so that it can forward packets appropriately. The RE does not
forward transit traffic or process Class of Service (CoS) marked traffic, as these tasks are
handled by the PFE.
Question # 7
In the Junos OS, which keyboard shortcut allows you to move to the start of the line?
A. Ctrl+a B. Ctrl+e C. Ctrl+w D. Ctrl+k
Answer: A
Explanation: In the Junos OS command-line interface (CLI), the keyboard shortcut Ctrl+a
is used to move the cursor to the start of the line. This is a common convention in many
command-line environments and text editors, providing a quick way to navigate to the
beginning of the current command or line of text without having to use the arrow keys. This
can be particularly useful for making quick edits to commands or for navigating long lines of
text more efficiently.
Question # 8
ExhibitExhibit[edit]root# set system host-name TEST_DEVICE [edit]root# commit[edit]'system’Missing mandatory statement: ’root-authentication’ error: commit failed: (missingmandatory statements) [edit] root#You are configuring a new device.Which action solves the error shown in the exhibit?
A. configuring a non-root username and password B. configuring a password for the root account C. loading the factory-default configuration D. reinstalling Junos
Answer: B
Explanation: The error message in the exhibit indicates that the root-authentication
statement is missing, which is mandatory for committing the configuration. In Junos OS, it
is required to set a password for the root account to commit any configuration changes.
This is a security measure to ensure that unauthorized users cannot access the device's
configuration mode. To solve the error shown in the exhibit, configuring a password for the
root account is necessary. This can be done by using the set system root-authentication
plain-text-password command, after which the user will be prompted to enter a new
password for the root account.
Question # 9
Which criteria does the Junos OS use to select an active route when two entries exist in therouting table?
A. the route with the lowest preference number B. the most recently learned dynamic route C. the route with the highest preference number D. the route with the highest metric
Answer: A
Explanation: In Junos OS, when two entries for the same destination exist in the routing
table, the route with the lowest preference number is selected as the active route. This
preference number, also known as the route preference or administrative distance, is used
to prioritize routes received from different routing protocols.
Question # 10
Exhibituser@router> show route 192.168.36.1inet.O: 5 destinations, 6 routes (5 active, 0 holddown, 0 hidden) + = Active Route, - = LastActive, * = Both192.168.36.1/32 *[Static/5] 00:00:31> to 10.1.1.2 via ge-0/0/10.0 [OSPF/IO] 00:02:21, metric 1 > to 10.1.1.2 via ge-0/0/10.0Referring to the exhibit, which route(s) will be selected by Junos for packet forwarding?
A. The OSPF route will be selected. B. The static route will be selected. C. The Junos OS randomly selects one route. D. The Junos OS selects both routes.
Answer: B
Explanation: Junos OS selects routes based on the route preference (also known as
administrative distance). Static routes typically have a lower route preference than OSPF
routes, meaning they are more preferred. Since the static route to 192.168.36.1/32 is
shown with a preference of 5, it will be selected over the OSPF route for packet forwarding,
assuming no other factors such as route filters or policies affect the routing decision.
Question # 11
Exhibit[edit system archival] user@router# show configuration {transfer-on-commit; archive-sites {"scp://[email protected] : /archive" password## SECRET-DATA"ftp://[email protected]:/archive" password "$9..."; ## SECRET-DATA.Referring to the exhibit, where are the configuration backup files stored?
A. Files are storedto the SCP site and the FTP site in a round-robinmanner. B. Files are storedto the SCP site and the FTP site simultaneously. C. Files are storedto any site as selected by Junos internally. D. Files are storedto the SCP site but if the transfer fails, then to theFTP site.
Answer: B
Explanation: In Junos OS, the archival configuration under [edit system] allows for the
automatic backup of configuration files to designated locations upon commit. When multiple
archive-sites are specified, as shown in the exhibit with both SCP and FTP sites listed, the
device does not choose between them or use them in a round-robin manner. Instead, it
attempts to transfer the configuration backup files to all specified sites simultaneously upon
each commit. This ensures redundancy and increases the likelihood that a backup will be
successfully stored even if one of the transfer methods or destinations fails.
Question # 12
You want to find out the chassis serial number of a Junos device.Which command would display this information?
A. show chassis environment B. show chassis hardware C. show chassis routing-engine D. show chassis location
Answer: B
Explanation: The show chassis hardware command in Junos OS displays detailed
information about the hardware installed in the device, including the chassis itself. This
command provides a list of all hardware components, their serial numbers, part numbers,
and version information. When looking for the chassis serial number specifically, this
command is the most direct and comprehensive way to retrieve that information, as it
includes the serial number of the chassis among the details provided.
Exhibit
[edit system archival] user@router# show configuration {
Which two statements apply to the Routing Engine functions? (Choose two.)
A. It responds to ping and traceroute commands. B. It maintains the routing tables. C. It does not process routing updates. D. It processes the transit traffic.
Answer: A,B
Explanation: The Routing Engine (RE) in Juniper Networks devices plays a critical role in
the control plane operations. One of its functions includes responding to network utility
commands like ping and traceroute, which are essential for diagnosing network
connectivity and path issues. Furthermore, the RE is responsible for maintaining the routing
tables, which contain information about network paths and destinations. These tables are
vital for making forwarding decisions but are distinct from the actual forwarding of packets, which is handled by the Packet Forwarding Engine (PFE).
Question # 14
Which two statements describe the result when you enter? at the command-line prompt? (Choose two.)
A. It lists the available commands and options. B. It lists tips for the help menu. C. It displays help about a text string contained in a statement. D. It displays summary information about the commands and options.
Answer: A,D
Explanation: When you enter ? at the command-line prompt in Junos OS, the system
provides assistance in two significant ways. Firstly, it lists the available commands and
options that can be used at the current point in the command hierarchy, aiding users in
understanding what commands they can execute next. Secondly, it displays summary
information about those commands and options, providing brief descriptions or additional
context that can help users understand the function of each command or option. This
feature is particularly useful for learning the command structure or for quick reference when
specific command syntax is forgotten.
Question # 15
Exhibit[edit]user@routerl set interfaces ge-0/1/2 unit 0 family inet address 172.16.101.1/24 [edit]user@router# commit checkconfiguration check succeeds[edit]user@router#You need to configure interface ge-0/1/2 with an IP address of 172.16.100.1/24. You haveaccidentally entered 172.16.101.1/24 as shown in the exhibit.Which command should you issue to solve the problem?
A. (edit] user@router# rollback 1 B. [edit] user@router# rollback 2 C. [edit] userOrouter# rollback 0 D. [edit] user@routeri rollback rescue
Answer: A
Explanation: If you've committed a configuration and then need to revert to the previous
configuration, the rollback command is used. Since the incorrect IP address has not been
committed, as indicated by the commit check command being successful, issuing
rollback 1 will undo the changes made in the current session, which includes the accidental entry of the IP address.
Question # 16
What will the request system configuration rescue save command do?
A. It saves the most recently committed configuration as the rescue configuration. B. It saves the candidate configuration as the rescue configuration. C. It saves a configuration version prior to the configuration most recently committed as the rescue configuration. D. It activates the rescue configuration.
Answer: A
Explanation: The request system configuration rescue save command in Junos OS saves
the most recently committed configuration as the rescue configuration. This rescue configuration can be used to recover the device if future configurations cause issues. It
ensures there is a stable, known-good configuration to fall back on, which is crucial in
network management and troubleshooting.
References:
"rescue : save configurations as the rescue: request system configuration save
.................( saves the current configs as a rescue configs )" from Useful Juniper
Commands.txt.
Juniper official documentation: Configuring and Activating a Rescue Configuration.
Question # 17
Which two addresses are included in an Ethernet frame header? (Choose two.)
A. source IP address B. source MAC address C. destination IP address D. destination MAC address
Answer: B,D
Explanation: An Ethernet frame header includes the source MAC address (B) and the
destination MAC address (D). These addresses are used to deliver the frame from one
Ethernet device to another directly connected Ethernet device on the same network
segment. Ethernet frames do not include IP addresses, as those are part of the IP packet
encapsulated within the Ethernet frame.
Question # 18
Which two addresses are included in an Ethernet frame header? (Choose two.)
A. source IP address B. source MAC address C. destination IP address D. destination MAC address
Answer: B,D
Explanation: An Ethernet frame header includes the source MAC address (B) and the
destination MAC address (D). These addresses are used to deliver the frame from one
Ethernet device to another directly connected Ethernet device on the same network
segment. Ethernet frames do not include IP addresses, as those are part of the IP packet
encapsulated within the Ethernet frame.
Question # 19
By default, how does the PFE manage unicast traffic destined for an existing forwarding table entry?
A. It sends the traffic through multiple ports toward its destination. B. It sends the traffic through one port toward its destination. C. It sends the traffic through the f xpl interface to the RE. D. It sends all traffic to the control plane for further processing.
Answer: B
Explanation: In a Juniper Networks device, the Packet Forwarding Engine (PFE) processes unicast traffic by forwarding it according to the existing entries in the forwarding
table. When the PFE encounters unicast traffic destined for an address that has a
corresponding entry in the forwarding table, it directs the traffic through a specific outgoing
interface or port toward its destination. This process is based on the most efficient path
determined by the routing protocols in use, ensuring that the packet reaches its intended
destination through a singular path, unless specific configurations such as load balancing
are in place.
Question # 20
What are two examples of exception traffic? (Choose two.)
A. transit packets B. routing updates C. log messages D. ping to the local device
Answer: B,C
Explanation: Exception traffic includes traffic that is not simply forwarded by the router but
requires special handling, such as routing updates (B) and log messages (C). These types
of traffic are processed by the router's control plane rather than just being forwarded
through the data plane.
Question # 21
Which type of device uses the destination IP address to forward packets?
A. Layer 3 router B. Layer 2 switch C. repeater D. hub
Answer: A
Explanation: A Layer 3 router forwards packets based on the destination IP address. It
operates at the network layer of the OSI model and uses routing tables to determine the
best path for packet delivery. Unlike Layer 2 switches, which forward packets based on
MAC addresses, routers handle logical addressing, making them crucial for inter-network
communication.
Reference:
Junos OS Documentation on Routing Fundamentals.
Question # 22
What does the user@router> clear log ospf-trace command accomplish?
A. Logging data into ospf-trace is stopped. B. Trace parameters are removed from the OSPF protocol configuration. C. Data in the ospf-trace file is removed and logging continues. D. The ospf-trace file is deleted.
Answer: C
Explanation: The clear log ospf-trace command on a Juniper Networks router is used
specifically to manage the contents of the log file named ospf-trace. Executing this
command clears or deletes the existing data within the ospf-trace log file but does not stop
the logging process. The router continues to log new OSPF-related events and data into
this file after the command is executed. This functionality is crucial for troubleshooting and
monitoring the OSPF (Open Shortest Path First) protocol's operation by allowing network
administrators to remove old or irrelevant log data while continuously capturing new events
without interruption.
Question # 23
You are asked to configure your device running Junos OS to automatically archive yourconfiguration upon commitIn this scenario, which two methods are supported by the Junos OS? (Choose two)
A. SCP B. RCP C. FTP D. HTTP
Answer: A,B
Explanation:
Junos OS supports multiple methods for automatically archiving configurations upon
commit. Two of the supported methods are SCP (Secure Copy Protocol) and RCP
(Remote Copy Protocol). These methods can be configured to save the configuration files
to a remote server automatically whenever a commit is made.
Reference: Juniper Networks Documentation on Configuration Archival
"You can configure Junos OS to automatically archive the configuration using protocols
such as SCP and RCP upon commit."
Question # 24
Which command displays all IPv6 routes in the default routing instance?
A. showroute table inet.0 B. showroute table inet6.1 C. showroute table inet.1 D. showroute table inet6.0
Answer: D
Explanation:
The show route table inet6.0 command displays all IPv6 routes in the default routing
instance. In Junos OS, the routing table for IPv6 addresses is referred to as inet6.0,
whereas inet.0 is used for IPv4 unicast routes. The other options do not correspond to the
correct IPv6 routing table.
References:
Juniper official documentation: Junos OS Routing Tables Overview.
Question # 25
Which component is considered part of the data plane?
A. the Routing Engine B. the Packet Forwarding Engine C. the power supply D. the fan tray
Answer: B
Explanation: The Packet Forwarding Engine (PFE) is an integral component of Juniper
Networks devices, responsible for the data plane operations. The data plane, also known
as the forwarding plane, is where the actual processing and forwarding of packets occur based on the routing and forwarding tables. The PFE executes the forwarding decisions
made by the Routing Engine (RE), handling all packet transmissions, including routing,
filtering, and switching packets towards their destination. This contrasts with the control
plane operations handled by the RE, which involve routing table maintenance, system
management, and control protocol processing.
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