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Frequently Asked Questions
Juniper JN0-480 Sample Question Answers
Question # 1
Exhibit.
Which two statements ate correct about the information shown in the exhibit? (Choose two.)
A. The system is fully managed by Juniper Apstra. B. The device shown is a generic system. C. Four physical interfaces exist in a LAG facing the leaf pair. D. The physical ports are not part of the LAG.
Answer: B,C
Explanation: According to the Juniper documentation1, a generic system is a device that is not managed by Juniper Apstra and does not have a specific role or type assigned to it.
A generic system can be used to represent a server, a firewall, a load balancer, or any
other device that is not part of the fabric. In the exhibit, the device shown is a generic
system, as indicated by its role, system type, and management level. Therefore, the correct
answer is B. The device shown is a generic system.
According to the Juniper documentation2, a LAG is a link aggregation group that bundles
multiple physical interfaces into a single logical interface. A LAG can provide increased
bandwidth, redundancy, and load balancing for the network traffic. In the exhibit, the device
shown has four physical interfaces that are part of a LAG, as indicated by their description
and li_type. The LAG is facing the leaf pair, which are the two switches that connect to the
device. Therefore, the correct answer is C. Four physical interfaces exist in a LAG facing
the leaf pair. References: Generic Systems (Datacenter Design), Form LAG | Apstra 4.1 |
Juniper Networks
Question # 2
When an agent installation is successful, devices are placed into which state using the Juniper Apstra Ul?
A. IS-MAINT B. OOS-READY C. OOS-QUARANTINED D. IS-ACTIVE
Answer: C
Explanation: When an agent installation is successful, devices are placed into the Out of
Service Quarantined (OOS-QUARANTINED) state using the Juniper Apstra UI. This state
means that the device is not yet managed by Apstra and has not been assigned to any
blueprint. The device configuration at this point is called Pristine Config. To make the
device ready for use in a blueprint, you need toacknowledge the device, which changes its
state to Out of Service Ready (OOS-READY)12. References:
Managing Devices
AOS Device Configuration Lifecycle
Question # 3
Which statement is true when onboarding a Juniper Networks device using a JuniperApstra ZTP server?
A. The Device Key lo be used can be set In the dhcpd.conf file on the ZTP server. B. The State can be set In the ztp.Json file on the ZTP server. C. The Management IP address cannot be predetermined. D. The Hostname will be the serial-number of the device.
Answer: B
Explanation: The ztp.Json file on the Apstra ZTP server contains the configuration
parameters for each device that is onboarded using ZTP. One of the parameters is the
State, which can be one of the following values: init, ready, in_progress, done, error,
or disabled. The State indicates the current status of the device in the ZTP process. For
example, if the State is ready, it means that the device is ready to be onboarded by the
Apstra ZTP server. If the State is done, it means that the device has completed the ZTP
process and is managed by the Apstra server. The State can be manually set or changed
in the ztp.Json file to control the behavior of the device during ZTP. For more information,
see Apstra ZTP Configuration File. References:
Apstra ZTP Configuration File
Apstra ZTP Introduction
Configure Apstra ZTP
Question # 4
What is the purpose of an interface map in Juniper Apstra?
A. An interface map associates a logical device with a device profile. B. An interface map specifies a connection between the interfaces of two devices. C. An interface map specifies the number of ports and the port speeds of a logical device D. An interface map specifies the connections between racks in a template.
Answer: B
Explanation: According to the Juniper documentation1, an interface map is a configuration
template that maps interfaces between logical devices and physical hardware devices (represented with device profiles) while adhering to vendor specifications. An interface map
specifies a connection between the interfaces of two devices, such as a leaf and a spine, a
leaf and a server, or a leaf and an external gateway. An interface map can also specify port
transformations, such as breaking out a 40 GbE port into four 10 GbE ports, or disabling
unused ports. An interface map can be used to achieve the intended network configuration
rendering and to enable features such as LAG, ESI-LAG, or MLAG. Therefore, the correct
answer is B. An interface map specifies a connection between the interfaces of two
You are installing a Juniper Apstra server in your data center. You have multiple users thatwill be expected to configure, manage, and carry out operational tasks in your data center.You have decided to implement remote user authentication for the role-based accesscontrol of your Apstra server.In this scenario, which three methods are supported? (Choose three.)
A. TACACS+ B. LDAP C. RADIUS D. SAML E. Auth0
Answer: A,B,C
Explanation: To implement remote user authentication for the role-based access control of
your Apstra server, you can use one of the following methods: TACACS+, LDAP, or
RADIUS. These are the protocols that Juniper Apstra supports to authenticate and
authorize users based on roles assigned to individual users within an enterprise. You can
configure the Apstra server to use one or more of these protocols as the authentication
sources and specify the order of preference. You can also configure the Apstra server to
use local user accounts as a fallback option if the remote authentication fails. The other
options are incorrect because:
D. SAML is wrong because SAML (Security Assertion Markup Language) is not a
supported protocol for remote user authentication for the role-based access control
of your Apstra server. SAML is an XML-based standard for exchanging
authentication and authorization data between different parties, such as identity
providers and service providers. SAML is commonly used for web-based single
sign-on (SSO) scenarios, but it is not compatible with the Apstra server.
E. Auth0 is wrong because Auth0 is not a protocol, but a service that provides
authentication and authorization solutions for web and mobile applications. Auth0
is a platform that supports various protocols and standards, such as OAuth,
OpenID Connect, SAML, and JWT. Auth0 is not a supported service for remote
user authentication for the role-based access control of your Apstra
server. References:
User Authentication Overview
[Juniper Apstra] Authentication and Authorization Debugging1
Authenticate User (API)
Configure Apstra Server
Question # 6
In the case of IP Clos data center five-stage fabric design, what are two rotes of the superspines? (Choose two.)
A. Super spines are used to interconnect two different data center pods. B. Super spines connect to all spine devices within the five-stage architecture. C. Super spines are used to connect leaf nodes within a data center pod. D. Super spines are always connected to an external data center gateway.
Answer: A,B
Explanation: In the case of IP Clos data center five-stage fabric design, the super spines
are the devices that provide the highest level of aggregation in the network. They have two
main roles:
Super spines are used to interconnect two different data center pods. A pod is a
cluster of leaf and spine devices that form a 3-stage Clos topology. A 5-stage Clos
topology consists of multiple pods that are connected by the super spines. This
allows for scaling the network to support more devices and bandwidth.
Super spines connect to all spine devices within the five-stage architecture. The
spine devices are the devices that provide the second level of aggregation in the
network. They connect to the leaf devices, which are the devices that provide
access to the end hosts. The super spines connect to all the spine devices in the
network, regardless of which pod they belong to. This provides any-to-any
connectivity between the pods and enables optimal routing and load balancing.
The following two statements are incorrect in this scenario:
Super spines are used to connect leaf nodes within a data center pod. This is not
true, because the leaf nodes are connected to the spine nodes within the
samepod. The super spines do not connect to the leaf nodes directly, but only
through the spine nodes.
Super spines are always connected to an external data center gateway. This is not
true, because the super spines are not necessarily involved in the external
connectivity of the data center. The external data center gateway is a device that
provides the connection to the outside network, such as the Internet or another
data center. The external data center gateway can be connected to the super
spines, the spine nodes, or the leaf nodes, depending on the design and the
Which two statements about VXLAN VNIs are correct? (Choose two.)
A. VNIs can have over 16 million unique values. B. VNIs identify a collision domain. C. VNIs identify a broadcast domain D. VNIs are alphanumeric values.
Answer: A,C
Explanation: VXLAN VNIs are virtual network identifiers that are used to identify and
isolate Layer 2 segments in the overlay network. VXLAN VNIs have the following
characteristics:
VNIs can have over 16 million unique values. This is because VXLAN VNIs are 24-
bit fields that can range from 4096 to 16777214, according to the VXLAN
standard1. This allows VXLAN to support a large number of Layer 2 segments and
tenants in the network.
VNIs identify a broadcast domain. This is because VXLAN VNIs are used to group
the end hosts that belong to the same Layer 2 segment and can communicate with
each other using VXLAN tunnels. The VXLAN tunnels are established using the
VTEP information that is distributed by EVPN. The VTEPs are VXLAN tunnel
endpoints that perform the VXLAN encapsulation and decapsulation. The VXLAN
tunnels preserve the Layer 2 semantics and support the broadcast, unknown
unicast, and multicast traffic within the same VNI2.
The following two statements are incorrect in this scenario:
VNIs identify a collision domain. This is not true, because VXLAN VNIs do not
identify a collision domain, which is a network segment where data packets can
collide with each other. VXLAN VNIs identify a broadcast domain, which is a
network segment where broadcast traffic can reach all the devices. Collision
domains are not relevant in VXLAN networks, because VXLAN uses MAC-in-UDP
encapsulation and IP routing to transport the Layer 2 frames over the Layer 3
network1.
VNIs are alphanumeric values. This is not true, because VXLAN VNIs are numeric
values, not alphanumeric values. VXLAN VNIs are 24-bit fields that can range from
4096 to 16777214, according to the VXLAN standard1. Alphanumeric values are
values that contain both letters and numbers, such as ABC123 or 1A2B3C.
References:
Virtual Extensible LAN (VXLAN) Overview
EVPN LAGs in EVPN-VXLAN Reference Architectures
Question # 8
Within Managed Devices in the Juniper Apstra Ul, you notice that several devices have theOOS-Quarantined status. The devices cannot be added to any blueprint. Which actionwould solve this problem?
A. Acknowledge the device. B. Fix the hardware issues with the quarantined devices. C. Install the agent, even though connectivity is established. D. Upload a new pristine configuration.
Answer: A
Explanation: When an agent installation is successful, devices are placed into the Out of
Service Quarantined (OOS-QUARANTINED) state using the Juniper Apstra UI. This state
means that the device is not yet managed by Apstra and has not been assigned to any
blueprint. The device configuration at this point is called Pristine Config. To make the
device ready for use in a blueprint, you need to acknowledge the device, which is a manual
action that confirms the device identity and ownership. Acknowledging the device changes
its status to Out of Service Ready (OOS-READY)12. References:
Managing Devices
AOS Device Configuration Lifecycle
Question # 9
Juniper Apstra has indicated an anomaly with respect to cabling.What are two ways to remediate the issue? (Choose two.)
A. Manually edit the cabling map. B. Redeploy the errant device. C. Set the invalid ports to a disabled state. D. Have Apstra autoremediate the cabling map using LLDP.
Answer: A,D
Explanation: A cabling anomaly is an issue that occurs when the physical connections
between the devices in the data center fabric do not match the expected connections
based on the Apstra Reference Design. A cabling anomaly can cause problems such as
incorrect routing, suboptimal traffic flow, or device isolation. To remediate the issue, you
can use one or both of the following methods:
Manually edit the cabling map. This allows you to override the Apstra-generated cabling and specify the correct connections between the devices. You can use the
Apstra UI or the Apstra CLI to edit the cabling map and apply the changes to the
fabric12.
Have Apstra autoremediate the cabling map using LLDP. This allows Apstra to
collect LLDP data from the devices and use it to update the cabling map
automatically. LLDP is a protocol that allows devices to exchange information
about their identity, capabilities, and neighbors. Apstra can use the LLDP data to
detect and correct any cabling errors in the fabric34. References:
Edit Cabling Map (Datacenter)
Import / Export Cabling Map (Datacenter)
LLDP Overview
Anomalies (Service)
Question # 10
Which statement is correct about the Juniper Apstra Rendered configuration?
A. It is built at commit time and stored in a MySQL database. B. It is stored in a NoSQL database and incrementally updated. C. It is dynamically tendered at commit time. D. It is rendered from the graph database and stored locally.
Answer: C
Explanation: The Juniper Apstra Rendered configuration is the configuration that is
generated from the staged blueprint and applied to the devices in the network. The
Rendered configuration is dynamically rendered at commit time, which means that it is created on the fly based on the latest changes and validations in the blueprint. The
Rendered configuration is not stored in any database, but it can be viewed in the Apstra UI
or downloaded as a file. The Rendered configuration reflects the desired state of the
network as defined by the intent of the blueprint. The other options are incorrect because:
A. It is built at commit time and stored in a MySQL database is wrong because the
Rendered configuration is not stored in any database, let alone a MySQLdatabase.
Apstra uses a graph database to store the network topology and configuration
data, not a relational database like MySQL.
B. It is stored in a NoSQL database and incrementally updated is wrong because
the Rendered configuration is not stored in any database, let alone a NoSQL
database. Apstra uses a graph database to store the network topology and
configuration data, not a non-relational database like NoSQL. The Rendered
configuration is not incrementally updated, but dynamically rendered at commit
time.
D. It is rendered from the graph database and stored locally is wrong because the
Rendered configuration is not rendered from the graph database, but from the
staged blueprint. The graph database stores the network topology and
configuration data, but the Rendered configuration is generated from the blueprint,
which is a logical representation of the network design and intent. The Rendered
configuration is not stored locally, but it can be downloaded as a file if
needed. References:
Config Rendering in Juniper Apstra
AOS Device Configuration Lifecycle
Configlets (Datacenter Design)
Question # 11
Which fabric type should be chosen in a template to create a five-stage Clos?
A. collapsed B. circuit switched C. rack-based D. pod-based
Answer: D
Explanation: According to the Juniper documentation1, a five-stage Clos architecture
allows for large-scale topologies with an additional aggregation layer that interconnects
multiple pods into a single fabric. A pod is a group of racks that share the same spine
devices. A rack is a group of leaf devices that connect to the same servers. To create a
five-stage Clos network using Juniper Apstra, you need to choose the pod-based fabric
type in the template creation wizard. This will allow you to specify the number of pods,
planes, spines, and leaves for your network design. Therefore, the correct answer is D.
What are two system-defined user roles that are available in Juniper Apstra? (Choose two.)
A. authorized B. root C. viewer D. user
Answer: C,D
Explanation: Juniper Apstra provides four system-defined user roles that are available in
the Apstra GUI environment. They are: administrator, device_ztp, viewer, and user1. Based
on the web search results, we can infer the following statements:
viewer: This role includes permissions to only view various elements in the Apstra
system, such as blueprints, devices, design, resources, external systems,
platform, and others. Users with this role cannot create, edit, or delete any
element12.
user: This role includes permissions to view and edit various elements in the
Apstra system, such as blueprints, devices, design, resources, external systems,
platform, and others. Users with this role cannot create or delete any element12.
authorized: This is not a system-defined user role in Juniper Apstra. It is a term
used to describe users who have been authenticated by an external system, such
as LDAP, Active Directory, TACACS+, or RADIUS3.
root: This is not a system-defined user role in Juniper Apstra. It is a term used to
describe the superuser account on a Linux system, which has full access to all
commands and files. Creating a user in the Apstra GUI does not provide that use access to the Apstra platform via SSH. To access the Apstra platform via SSH,
you must create a local Linux system user4. References:
User / Role Management Introduction
User/Role Management (Platform)
AAA Providers
User Profile Management
Question # 13
In the Juniper Apstra Ul. which three resources are assigned under the Resources menu?(Choose three.)
A. VTEP pools B. ASN pools C. VNI pools D. logical device pools E. IP address pools
Answer: B,C,E
Explanation: In the Juniper Apstra UI, the Resources menu allows you to create and
manage global and local resources that are used for various elements of the network
design and configuration. The Resources menu includes the following three types of
resources that can be assigned to the network devices and virtual networks:
ASN pools: These are pools of autonomous system numbers (ASNs) that are used
for the underlay routing protocol (EBGP) between the leaf and spine devices. You
can create ASN pools with either 2-byte or 4-byte ASNs, and assign them to the
logical devices in the blueprint.
VNI pools: These are pools of virtual network identifiers (VNIs) that are used for
the overlay network (VXLAN) between the end hosts. You can create VNI pools
with a range of VNIs, and assign them to the virtual networks in the blueprint.
IP address pools: These are pools of IPv4 or IPv6 addresses that are used for
various purposes in the network, such as the loopback addresses for the devices,
the IP prefixes for the virtual networks, the host IP addresses for the end hosts,
and the gateway IP addresses for the IRB interfaces. You can create IP address
pools with a range of IP addresses, and assign them to the logical devices and virtual networks in the blueprint.
The following two types of resources are not assigned under the Resources menu:
VTEP pools: These are not resources that can be created or assigned by the user.
VTEPs are VXLAN tunnel endpoints that are automatically generated by the
Apstra server based on the loopback IP addresses of the devices. VTEPs are
used as the source and destination IP addresses for the VXLAN tunnels in the
overlay network.
Logical device pools: These are not resources that can be created or assigned by
the user. Logical device pools are groups of logical devices that share the same
role, interface map, and resource assignments in the blueprint. Logical device
pools are used to simplify the network design and configuration by applying the
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