24 free Juniper JN0-683 JNCIP-DC practice questions from the CertStash pack of 94, each with the correct answer and a full explanation. The rule is the same for every exam: ten free on the product page, 24 free here, all 94 in the pack, and each step includes the one before it.
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Question 1
You want to convert an MX Series router from a VXLAN Layer 2 gateway to a VXLAN Layer 3 gateway for VNI 100. You have already configured an IRB interface. In this scenario, which command would you use to accomplish this task?
Show answer and explanation
Correct answer: A. set bridge-domains VLAN-100 routing-interface irb.100
Converting an MX Series router from a Layer 2 VXLAN gateway to a Layer 3 gateway requires associating the IRB interface with the bridge domain using the routing-interface parameter. This command establishes the IRB interface as the Layer 3 gateway for the specified bridge domain, enabling routing functionality for VNI 100.
Why the other options are wrong
- B. ISIS passive configuration on the IRB interface does not convert the gateway from Layer 2 to Layer 3; it only configures routing protocol behavior.
- C. OSPF passive configuration similarly configures routing protocol parameters but does not perform the Layer 2 to Layer 3 gateway conversion.
- D. This command syntax is incorrect and does not represent a valid Junos configuration for associating an IRB interface with a bridge domain.
Question 2
You are asked to identify microburst traffic occurring in the network leading to packet drops in your data center switches. Which two tools would be used in this scenario? (Choose two.)
Show answer and explanation
Correct answer: A, B. port buffer monitoring; port mirroring
Port buffer monitoring allows visibility into buffer utilization and overflow conditions that cause packet drops during microbursts, while port mirroring enables traffic analysis to identify the characteristics and patterns of microburst traffic. Together, these tools provide both detection and analysis capabilities for diagnosing microburst-related packet loss.
Why the other options are wrong
- C. Syslog captures system messages and alerts but cannot directly monitor real-time buffer conditions or capture packet-level microburst traffic patterns.
- D. Traceoptions primarily records control plane operations and packet processing diagnostics rather than monitoring data plane buffer conditions or identifying microburst patterns.
Question 3
You are deploying an IP fabric with an oversubscription ratio of 3:1. In this scenario, which two statements are correct? (Choose two.)
Show answer and explanation
Correct answer: A, D. The oversubscription ratio remains the same when you remove leaf devices; The oversubscription ratio remains the same when you add leaf devices.
The oversubscription ratio of an IP fabric is set by each leaf's ratio of server-facing downlink bandwidth to spine-facing uplink bandwidth. Adding or removing leaf devices changes the size of the fabric but not that per-leaf ratio. The ratio therefore remains 3:1 in both cases.
Why the other options are wrong
- B. Removing leaf devices does not change the downlink-to-uplink ratio of the remaining leaves.
- C. Adding leaf devices with the same port layout keeps the same per-leaf ratio, so oversubscription does not decrease.
Question 4
You are deploying multiple Juniper switches at the same location. Your switches are currently using the factory-default configuration. In this scenario, which two statements are correct? (Choose two.)
Show answer and explanation
Correct answer: B, D. The switch will try to request an IP address from a DHCP server using all interfaces that are connected and are operational; The DHCP server configuration can provide Junos version requirements to DHCP clients.
In factory-default configuration, Juniper switches attempt DHCP address requests only through the management interface (me0) to obtain management plane connectivity, not through all operational interfaces. Additionally, DHCP server configurations support vendor-specific options that can communicate Junos version requirements and other device-specific parameters to DHCP clients.
Why the other options are wrong
- A. DHCP servers can provide Junos version requirements through vendor-specific DHCP options, allowing version-aware configurations.
- C. While the management interface is the primary interface used for DHCP requests in factory-default configurations, the statement that it uses 'only' the management interface is not universally accurate across all deployment scenarios.
Question 5
Which two statements are true about a pure IP fabric? (Choose two.)
Show answer and explanation
Correct answer: A, C. An IP fabric does not support Layer 2 protocols; Devices in an IP fabric function as Layer 3 routers.
A pure IP fabric operates exclusively at Layer 3, with all devices functioning as routers that forward traffic based on IP routing protocols rather than Layer 2 switching. This architecture eliminates Layer 2 protocols and VLANs, replacing them with IP-based routing and segmentation mechanisms for improved scalability and predictability.
Why the other options are wrong
- B. Pure IP fabrics do not support Layer 2 VLANs; instead they use Layer 3 routing and overlay networks for traffic segmentation.
- D. While some fabric controllers may be used for orchestration, devices in a pure IP fabric do not require mandatory connection to a fabric controller to function as routers.
Question 6
A customer wants any device-to-device link in the routed underlay infrastructure to fail over in less than two seconds. They do not want to adjust the routing protocol timers due to the size of the network. In this scenario, which feature should they use to satisfy the requirements?
Show answer and explanation
Correct answer: A. BFD
Bidirectional Forwarding Detection (BFD) provides rapid link fault detection with sub-second convergence times (typically 300ms or less), enabling quick failover without requiring adjustments to routing protocol timers. This makes BFD the ideal solution for achieving failover in under two seconds across large networks.
Why the other options are wrong
- B. LLDP is a discovery protocol that does not provide active link monitoring or failover capabilities.
- C. RSTP provides Layer 2 spanning tree convergence but is not suitable for routed underlay infrastructure and has slower convergence than BFD.
- D. MC-LAG is for multi-chassis link aggregation and does not address point-to-point link failover in the underlay routing infrastructure.
Question 7
Which protocol permits the highest level of scalability for an IP underlay fabric?
Show answer and explanation
Correct answer: D. EBGP
EBGP (External BGP) provides the highest scalability for IP underlay fabrics because it supports path selection policies, load balancing across multiple parallel paths, and massive network scale without the limitations of distance-vector or interior gateway protocols. BGP's flexibility and proven deployment at internet scale make it the preferred choice for large fabric deployments.
Why the other options are wrong
- A. RIP has severe scalability limitations with maximum hop count restrictions and slower convergence, making it unsuitable for modern IP fabric deployments.
- B. RSVP is a traffic engineering and quality-of-service protocol, not a primary underlay routing protocol for fabric scalability.
- C. VXLAN is an overlay encapsulation protocol used above the routing underlay, not the underlay routing protocol itself.
Question 8
You are asked to automatically provision new Juniper Networks devices in your network with minimal manual intervention. Before you begin, which two statements are correct? (Choose two.)
Show answer and explanation
Correct answer: B, C. You must have a DHCP server that provides the location of the software image and configuration files; You must have a file server that stores software image and configuration files.
Automatic provisioning of Juniper devices requires a file server to store software images and configuration files that will be downloaded during the provisioning process, and a DHCP server to provide the location of these files and deliver configuration parameters. While syslog and NTP are useful for network operations, they are not mandatory components for the core provisioning process itself.
Why the other options are wrong
- A. Syslog servers manage log messages but are not required for the initial provisioning process.
- D. NTP synchronization is useful but not a mandatory requirement for device provisioning to occur.
Question 9
You are asked for TX and RX traffic statistics for each interface to which an application server is attached. The statistics need to be reported every five seconds. Using the Junos default settings, which telemetry method would accomplish this request?
Show answer and explanation
Correct answer: A. Native Sensors
Native Sensors is Juniper's native telemetry solution that provides real-time streaming of interface statistics at configurable intervals (such as every five seconds) with minimal overhead. This push-based approach delivers TX and RX traffic statistics directly from the device without the polling overhead associated with SNMP or other pull-based methods.
Why the other options are wrong
- B. OpenConfig is a data model standard but requires a telemetry transport mechanism and does not inherently provide five-second reporting intervals by default.
- C. SNMP uses a pull model where the collector must poll devices, rather than the device pushing statistics at regular intervals.
- D. gNMI is a transport protocol for model-driven telemetry but does not define the default sampling rate; Native Sensors is the appropriate Junos method.
Question 10
You are asked to deploy 100 QFX Series devices using ZTP. Each QFX5120 requires a different configuration. In this scenario, what are two components that you would configure on the DHCP server? (Choose two.)
Show answer and explanation
Correct answer: A, B. the IP address of the FTP server; the MAC address for each QFX5120
For ZTP with a different configuration on each QFX5120, the DHCP server must identify each device by its MAC address so it can hand out the correct configuration file name. It must also supply the address of the file server (here the FTP server) from which the device downloads its configuration and image. These are the two key DHCP server components.
Why the other options are wrong
- C. Management addresses can come from a DHCP pool; a pre-assigned management IP is not what makes per-device ZTP work.
- D. Devices reach the file server by IP address, so its MAC address is not configured on the DHCP server.
What people say about the full JN0-683 pack 5.0 from 2
Great JN0-683 exam materials. I liked how Cert Stash’s JN0-683 questions challenged design reasoning rather than trivia. Topics like EVPN, fabric routing, and automation were realistic. A solid prep tool for data center engineers.
Question 11
You are deploying an IP fabric using EBGP and notice that your leaf devices are advertising and receiving all the routes. However, the routes are not installed in the routing table and are marked as hidden. Which two statements describe how to solve the issue? (Choose two.)
Show answer and explanation
Correct answer: B, C. You need to configure multipath multiple-as; You need to configure loops 2.
When routes are advertised and received but marked as hidden and not installed in the routing table, the issue is typically that ECMP cannot be enabled. Option B is correct: configuring multipath multiple-as enables ECMP for routes learned from peers with different AS numbers. Option C is correct: configuring loops 2 allows the BGP loop detection to accept routes with the local AS number appearing up to 2 times, which resolves the hidden route issue in fabric topologies.
Why the other options are wrong
- A. A next-hop self policy is used for route export from route reflectors, not for resolving hidden routes in this scenario.
- D. As-override is used to replace the peer AS number with the local AS for outbound routes, not to resolve hidden routes.
Question 12
You are deploying a Clos IP fabric with an oversubscription ratio of 3:1. In this scenario, which two statements are correct? (Choose two.)
Show answer and explanation
Correct answer: A, B. The oversubscription ratio decreases when you add spine devices; The oversubscription ratio increases when you remove spine devices.
Oversubscription is the ratio of leaf downlink bandwidth to leaf uplink bandwidth toward the spines. Adding spine devices adds uplinks on each leaf, increasing uplink capacity and lowering the ratio. Removing spine devices removes uplinks and raises the ratio.
Why the other options are wrong
- C. Adding spines adds uplink capacity on every leaf, so the ratio decreases rather than staying the same.
- D. Removing spines reduces uplink capacity on every leaf, so the ratio increases rather than staying the same.
Question 13
You are adding a server to a tenant’s network within your data center and must limit access to a specific traffic type within the tenant network without pushing all tenant traffic through a firewall. What will satisfy this requirement?
Show answer and explanation
Correct answer: A. Use filter-based forwarding.
Filter-based forwarding uses a firewall filter to match only the specific traffic type and redirect it, for example to a firewall routing instance, while all other tenant traffic is forwarded normally. This limits access to the new server for that traffic type without sending the whole tenant through a firewall. It gives precise, per-traffic-type control.
Why the other options are wrong
- B. A unique subnet on its own does not restrict any traffic type without additional controls.
- C. Route leaking controls reachability between routing instances by prefix, not access for a specific traffic type.
- D. A static route to the firewall sends all traffic for the server through the firewall, not just the specific traffic type.
Question 14
Due to heavy congestion, some VXLAN packets are being lost. In this scenario, which two statements are correct? (Choose two.)
Show answer and explanation
Correct answer: A, C. The VXLAN has no retransmission capability; The host endpoints determine when to retransmit any lost packets.
VXLAN operates as an encapsulation protocol without built-in retransmission mechanisms; any lost VXLAN packets are not recovered at the VXLAN layer itself. The responsibility for detecting and retransmitting lost packets falls to the host endpoints and their transport layer protocols (such as TCP), which operate independently of the VXLAN tunnel. EVPN congestion notifications do not provide retransmission capabilities, and VXLAN does not use acknowledgement packets like traditional reliable protocols.
Why the other options are wrong
- B. EVPN congestion notifications signal congestion state but do not trigger retransmission of lost VXLAN packets.
- D. VXLAN is connectionless and does not use acknowledgement packets for reliability.
Question 15
A local VTEP has two ECMP paths to a remote VTEP. Which two statements are correct when load balancing is enabled in this scenario? (Choose two.)
Show answer and explanation
Correct answer: C, D. The source port in the UDP header is used to load balance VXLAN traffic; The inner packet fields are used in the hash for load balancing.
When load balancing VXLAN traffic across ECMP paths, the hash calculation uses both the inner packet fields (source and destination addresses/ports) and the outer UDP header fields. The source port in the UDP header is particularly important because it is often derived from a hash of the inner packet fields, providing entropy for load balancing. The destination port (typically fixed at 4789) is not used in the hash. The inner packet fields are essential to the hash calculation, ensuring traffic from the same flow follows consistent paths.
Why the other options are wrong
- A. Inner packet fields are actively used in the hash calculation to distribute VXLAN traffic.
- B. The UDP destination port is typically static (4789) and not used for load balancing hash calculation.
Question 16
You must integrate several leaf nodes that do not support the EVPN-VXLAN architecture into your existing EVPN-VXLAN-based IP fabric. In this scenario, which two design considerations would accomplish this task? (Choose two.)
Show answer and explanation
Correct answer: A, D. Ethernet segment identifier; collapsed fabric
Leaf devices that cannot run EVPN-VXLAN can still be attached to the fabric as plain Layer 2 switches. Multihoming them to EVPN-capable devices with an Ethernet segment identifier (ESI-LAG) provides active redundant connectivity, and a collapsed fabric design places EVPN-VXLAN on the collapsed spine while legacy switches connect below it. Both approaches integrate non-EVPN leaves.
Why the other options are wrong
- B. Edge-routed bridging requires the leaf devices themselves to run EVPN-VXLAN and perform routing, which these leaves cannot do.
- C. GRE is a generic tunneling protocol and is not a design method for integrating leaves into an EVPN-VXLAN fabric.
Question 17
You are using a single tenant data center with a bridged overlay architecture. In this scenario, how do hosts of the different virtual networks communicate with each other?
Show answer and explanation
Correct answer: C. off-fabric using an external device
In a single-tenant, bridged overlay architecture, hosts on different virtual networks cannot communicate with each other through the overlay fabric because the overlay is purely layer 2 bridging without integrated routing. Communication between different virtual networks requires layer 3 routing, which must occur off-fabric through an external routing device such as a physical router or firewall. This maintains network segmentation and allows centralized policy control.
Why the other options are wrong
- A. Anycast gateway addresses on leaf devices enable inter-VN routing in routed overlay architectures, not bridged overlays.
- B. EVPN Type 5 routes are used in IRB (integrated routing and bridging) architectures, not pure bridged overlays.
- D. Virtual gateway addresses are not configured on spine devices in standard data center fabric designs.
Question 18
You are deploying a new network to support your AI workloads on devices that support at least 400 Gbps Ethernet. There is no requirement for any Layer 2 VLANs in this network. Which network architecture would satisfy this requirement?
Show answer and explanation
Correct answer: D. an IP fabric using EBGP
An IP fabric using EBGP satisfies the requirement for supporting AI workloads with at least 400 Gbps Ethernet and no Layer 2 VLAN requirement. EBGP-based IP fabrics are pure Layer 3 architectures that scale to support high-bandwidth AI workloads without the overhead of VXLAN encapsulation or MPLS, and they naturally support 400 Gbps Ethernet interfaces without Layer 2 dependencies.
Why the other options are wrong
- A. EVPN-MPLS architecture is designed for environments requiring Layer 2 VLAN support and multi-tenancy, which is explicitly not a requirement here.
- B. EVPN-VXLAN adds overlay encapsulation overhead that is unnecessary for AI workloads that only require pure Layer 3 connectivity.
- C. PIM-SM is a multicast signaling protocol not required for simple VXLAN overlay in AI workloads, and adds unnecessary complexity.
Question 19
Which two statements are correct about an ERB architecture? (Choose two.)
Show answer and explanation
Correct answer: C, D. Routing in an ERB architecture occurs on the leaf devices; The VTEPs in an ERB architecture terminate on the leaf devices.
In an edge-routed bridging (ERB) architecture, routing is performed on the leaf devices at the edge of the fabric, where VTEPs terminate. This contrasts with centralized routing models where routing occurs at spine devices. The VXLAN tunnel endpoints reside on the leaf devices because they are responsible for making routing decisions and performing the necessary encapsulation and decapsulation for inter-subnet traffic.
Why the other options are wrong
- A. In ERB, VTEPs terminate on leaf devices, not spine devices; spines are primarily used for interconnect.
- B. In ERB, routing occurs on leaf devices, not spine devices; spines only forward encapsulated packets.
Question 20
Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)
Show answer and explanation
Correct answer: B, C. Unnumbered BGP requires that family inet6 is configured on each interface; Unnumbered BGP peering automatically provisions IPv6 peering.
Unnumbered BGP peering automatically provisions IPv6 peering using link-local addresses on interfaces, making option C correct. Option B is correct because unnumbered BGP requires that family inet6 be configured on each interface to enable IPv6 address families for the peering sessions. Unnumbered BGP uses IPv6 link-local addresses for peering, not IPv4, so IPv4 peering is not automatically provisioned.
Why the other options are wrong
- A. Unnumbered BGP provisions IPv6 peering, not IPv4 peering.
- D. Family inet is not required for unnumbered BGP; family inet6 is the requirement for IPv6-based unnumbered peering.
Question 21
You want to ensure that VXLAN traffic from the xe-0/0/12 interface is being encapsulated by logical vtep.32770 and sent to a remote leaf device. In this scenario, which command would you use to verify that traffic is flowing?
Show answer and explanation
Correct answer: B. show interfaces vtep.32770 detail
The command show interfaces vtep.32770 detail displays the logical VTEP interface with its input and output packet and byte counters. Watching those counters increase confirms that traffic is being encapsulated by that VTEP and sent to the remote leaf. It is the valid command that shows traffic statistics for the interface.
Why the other options are wrong
- A. monitor traffic on xe-0/0/12 captures packets on the physical access interface and does not confirm encapsulation by the VTEP.
- C. Terse output shows only interface status and addresses, with no traffic counters.
- D. Terse output does not provide traffic counters, so combining it with statistics does not verify traffic flow.
Question 22
You are asked to configure active probes to track and monitor reachability across the network and investigate network issues. In this scenario, which feature would accomplish this task?
Show answer and explanation
Correct answer: D. RPM
RPM (Real-time Performance Monitoring) is the Juniper feature that uses active probes to generate test traffic and monitor reachability, latency, and packet loss across the network. This active probing approach allows administrators to track network performance and investigate connectivity issues between specific endpoints.
Why the other options are wrong
- A. IPFIX is a passive flow export protocol for collecting flow information, not an active probing mechanism.
- B. RMON is a remote monitoring standard focused on passive traffic analysis and statistics, not active probe generation.
- C. sFlow is a passive sampling mechanism for monitoring traffic statistics, not an active probing tool.
Question 23
You are asked to configure telemetry on the QFX Series devices in your data center fabric. You want to use sensors that have a vendor-neutral data model. Which type of sensor should you use in this scenario?
Show answer and explanation
Correct answer: B. JTI OpenConfig sensors
JTI OpenConfig sensors use vendor-neutral data models based on the OpenConfig initiative, enabling consistent telemetry collection across multivendor environments without vendor-specific formatting. JTI native sensors are Juniper-specific and not vendor-neutral. Python sensors allow custom scripting but are not standardized data models. Analog sensors measure physical phenomena and are not applicable to network telemetry collection.
Why the other options are wrong
- A. JTI native sensors are Juniper-proprietary and not vendor-neutral.
- C. Python sensors enable custom telemetry but do not provide vendor-neutral data models.
- D. Analog sensors measure physical characteristics and are not relevant to network telemetry.
Question 24
You are deploying a solution to monitor your data center devices’ interface RX statistics. The solution should be a push-based model. Which solution will accomplish this behavior?
Show answer and explanation
Correct answer: A. JTI
JTI (Juniper Telemetry Interface) is Juniper's native push-based telemetry solution where devices actively stream interface statistics and other metrics to a collector at configured intervals. This push model eliminates the need for the collector to poll devices, making it ideal for real-time monitoring of interface RX statistics in data center environments.
Why the other options are wrong
- B. CLI is a pull-based manual command interface, not an automated monitoring solution.
- C. SNMP operates on a pull model where the collector must periodically poll devices for statistics.
- D. NETCONF is a configuration management protocol that uses a pull model for retrieving data, not a push-based streaming telemetry solution.
That was 24 of 94.
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