Prepare Smarter for the JN0-280 Exam with Our Free and Accurate JN0-280 Exam Questions – Updated for 2025.

At Cert Empire, we are dedicated to delivering the most reliable and up-to-date exam questions for students preparing for the Juniper JN0-280 Exam. To make preparation easier, we’ve made sections of our JN0-280 exam resources free for everyone. You can practice as much as you like with Free JN0-280 Practice Test.

Get JN0-280 Exam Dumps

Juniper JN0-280 Free Exam Questions

Disclaimer

Please keep a note that the demo questions are not frequently updated. You may as well find them in open communities around the web. However, this demo is only to depict what sort of questions you may find in our original files.

Nonetheless, the premium exam dumps files are frequently updated and are based on the latest exam syllabus and real exam questions.

1 / 60

In Junos OS, what does the command show security flow session display?

The routing session table for incoming and outgoing traffic

The number of active VPN sessions and the corresponding encryption status

A snapshot of all policies applied to the device, including security rules and actions taken

Information about active sessions, including the source/destination IP addresses and the current session state

2 / 60

What is the primary role of the "Virtual Router" in Junos OS when using Layer 3 VPN configurations?

To assign Layer 3 addresses to virtual routers in a multi-VPN environment

To isolate and maintain separate routing tables for each VPN, enabling multi-tenancy

To provide Layer 3 forwarding capabilities for secure communication between different devices

To ensure that only Layer 3 VPN traffic is forwarded through the device, blocking all other traffic

3 / 60

In Junos OS, what happens if a firewall filter is applied to an interface, and the filter matches traffic with a discard action?

The firewall filter drops the traffic and generates a log message

The firewall filter will log the dropped traffic but allow it through

The firewall filter drops the traffic but silently forwards it to the next hop

The firewall filter generates a deny message and drops the traffic without logging

4 / 60

When configuring an SRX device with a custom security policy, which of the following is a critical element to ensure the policy works as intended?

Configuring route redistribution within the security policy for each interface

Ensuring the security zones are correctly defined and interfaces assigned to the correct zones

Ensuring the interface has the correct IP address for source/destination matching

Assigning the policy to a routing instance to determine where traffic is forwarded

5 / 60

In Junos OS, when configuring an interface to operate in “Layer 2” mode, which of the following statements is true?

The interface must be assigned a unique IP address to function correctly

The interface can participate in routing protocols such as OSPF and BGP

The interface acts as a bridge, forwarding traffic based on MAC addresses

The interface is configured as part of a routing instance and can be used to forward traffic to multiple subnets

6 / 60

In Junos OS, what is the purpose of the "spanning-tree" protocol?

To ensure that IP addresses are distributed evenly across multiple routers

To prevent network congestion by controlling the number of active interfaces

To allow switches to detect and block redundant network paths to avoid broadcast storms

To enable Layer 2 VPNs and ensure that traffic is encapsulated before it is sent across the network

7 / 60

When configuring an SRX firewall to permit only specific types of traffic, which of the following should be done first?

Set up the security zones before creating any policy rules

Create a default deny policy to block all traffic and then specify exceptions

Set up a routing policy to prioritize specific types of traffic

Configure the policy rules to allow inbound traffic from all networks

8 / 60

In a Juniper SRX device, which statement is true about zones in a security policy?

Zones only exist in transparent mode configurations

Zones are used to define the logical structure of routing protocols

Zones allow you to group multiple interfaces for applying common security policies

Zones represent logical separation of broadcast domains within a single security policy

9 / 60

Which of the following best describes the purpose of the "load balancing" feature in Junos OS?

It enables faster routing decisions by caching frequently accessed routes

It is used to configure link aggregation between switches to improve throughput

It optimizes the routing of multicast traffic within a network by duplicating the packet across multiple paths

It distributes incoming and outgoing traffic across multiple paths to optimize network performance and redundancy

10 / 60

What is the primary function of the "security policies" in Junos OS?

To enforce routing policies for external connections

To manage the interface configurations on the device

To define rules that control the traffic flow between security zones

To specify the encryption protocols used for secure communication

11 / 60

When configuring a Juniper SRX device to use IPSec VPN, which of the following is a mandatory step?

Configuring the IKE policy and proposal for phase 1 negotiation

Setting up a routing instance specifically dedicated to VPN traffic

Configuring the static route pointing to the destination network for the VPN

Enabling the ESP (Encapsulating Security Payload) protocol globally for the entire device

12 / 60

In Junos OS, what is the purpose of the "interface reth" configuration in an SRX cluster?

It is used to create redundant interfaces for the firewall policies

It combines two physical interfaces into a single logical interface for higher bandwidth

It is used to configure the routing instance for the internal network in the SRX firewall

It represents a logical interface used for HA (High Availability) communication between SRX devices in a cluster

13 / 60

Which of the following commands is used to check the BGP status and adjacency on a Juniper router?

Show route bgp

Show protocol bgp

Show bgp neighbors

Show ip bgp status

14 / 60

What is the purpose of the "nat" feature on Juniper SRX devices?

It allows secure communications between two remote sites via a GRE tunnel

It prevents unauthorized access to the network by blocking all incoming traffic

It provides VPN services for remote clients to access the internal network securely

It modifies the source or destination address of IP packets to ensure correct routing through firewalls

15 / 60

In Junos OS, when configuring a routing instance for a VPN, which of the following statements is true?

A routing instance can only be used for Layer 3 VPNs and not for Layer 2 VPNs

Each routing instance can have its own independent routing table and policies for forwarding traffic

The routing instance must be configured with a dedicated interface and a separate management VLAN

The routing instance automatically supports VRRP (Virtual Router Redundancy Protocol) when configured

16 / 60

Which of the following is the primary function of the Juniper "commit check" command in the context of configuration changes?

It checks for syntax errors in the configuration file and automatically fixes them

It commits the configuration changes, but only in a staging environment for testing

It verifies that all interfaces are up and operational before committing any configuration changes

It simulates the configuration changes to ensure they are valid and will not disrupt the network when committed

17 / 60

When configuring a Juniper SRX device in transparent mode, which of the following statements about the device’s interfaces is true?

Transparent mode interfaces must have a Layer 3 interface IP to participate in routing

Transparent mode interfaces cannot be assigned IP addresses; they simply forward traffic between VLANs

Transparent mode interfaces use virtual routing to determine how traffic is forwarded between devices

In transparent mode, the device is essentially a bridge and does not require IP addressing on its interfaces

18 / 60

In Junos OS, which of the following commands is used to verify the status and health of a Juniper firewall's security policies?

Show policy-status

Show security policies

Show firewall policy status

Show security flow session

19 / 60

In the Junos OS, which of the following is true about the behavior of routing policies applied under the policy-options hierarchy?

Routing policies are applied globally and cannot be modified per protocol or interface

Routing policies can influence the selection of routes based on metrics, filters, and other defined criteria

Routing policies in Junos OS are used exclusively for managing VPN tunnel establishment and encryption

Routing policies are applied only to external routes and do not affect internal routes within the same Autonomous System

20 / 60

Which of the following is the correct use case for implementing a Layer 3 VPN on a Juniper SRX device?

To provide secure remote access to branch offices via SSL VPN

To enable routing between two networks over a public infrastructure with the use of MPLS

To create an isolated virtual network within the device using the concept of "logical systems."

To establish direct IPsec tunnels between two sites, bypassing the need for traditional routing.

21 / 60

In Junos OS, what is the primary function of the "fpc" in the context of SRX devices?

It manages firewall policies and configurations on the device

It is used to configure routing protocols like OSPF and BGP on the device

It refers to the Forwarding Plane Card, responsible for packet processing and forwarding in hardware

It is a virtual component used for distributing traffic load across multiple physical interfaces

22 / 60

Which of the following statements is true about the use of Virtual Chassis technology in Junos OS?

Virtual Chassis is used to combine multiple SRX devices into a single logical routing instance

Virtual Chassis configuration requires all devices in the group to be of the same hardware model and software version

Virtual Chassis supports the creation of multiple virtual routers per chassis for segmentation of traffic

Virtual Chassis allows the combination of up to 10 devices, providing redundancy and scaling for large networks

23 / 60

When configuring BGP route aggregation in Junos OS, which of the following statements is true regarding the aggregation process?

Route aggregation in BGP always results in the advertisement of the most specific prefix

BGP route aggregation requires manual configuration of the aggregation policy on each eBGP peer

BGP aggregation combines multiple routes with the same prefix and identical AS paths into a single route

When an aggregate route is created, all underlying detailed routes are completely removed from the routing table

24 / 60

In Junos OS, when configuring a network with two OSPF routers, which condition must be met for the routers to establish an OSPF adjacency?

The OSPF router IDs must be manually configured to match each other

The OSPF process ID must be the same on both routers for adjacency to form

OSPF must be configured with the same area ID but can have different network types

The interfaces must have matching MTU (Maximum Transmission Unit) values to establish adjacency

25 / 60

When configuring an SRX device in a HA (High Availability) cluster with multiple active zones, which of the following statements is true regarding the synchronization of policies across the cluster?

Synchronization of security policies requires configuring the HA policy synchronization settings separately

Only the primary SRX device stores the security policies; the backup device needs to be manually configured

Policies are synchronized automatically between devices as long as they are part of the same security zone

The synchronization of policies between the two devices requires a dedicated management interface to communicate

26 / 60

In the Junos OS, what happens if a router's BGP session becomes idle due to a failure to maintain a BGP keepalive?

The router will stop accepting any new BGP updates until the session is re-established

The router will attempt to re-establish the BGP session by sending an explicit "connect" request

The router will automatically update its routing table, replacing BGP routes with alternative routes from other routing protocols

The router will transition the BGP session to a "paused" state and continue routing without disruption

27 / 60

When configuring MPLS (Multiprotocol Label Switching) on a Juniper device, which of the following conditions must be met for MPLS LDP (Label Distribution Protocol) to function correctly?

All routers in the MPLS network must be running OSPF

The LDP session must be manually configured with a list of neighbors

LDP can only operate between routers that are part of the same OSPF area

MPLS must be enabled globally, and LDP must be configured to distribute labels for MPLS forwarding

28 / 60

When implementing a Juniper SRX device in a DMZ (demilitarized zone) network, which of the following security policies is critical to ensure proper functionality?

Allow only the necessary inbound traffic from external networks to the DMZ services while blocking all others

Allow all inbound and outbound traffic between internal and external networks

Enable the SRX device to permit all traffic between the DMZ and the internal network, with no restrictions

Deny all traffic to and from the DMZ for maximum security, relying solely on external firewalls for protection

29 / 60

In Junos OS, which of the following statements about BGP (Border Gateway Protocol) configuration is correct when using the set policy-options policy-statement command to filter routes?

The policy-statement command can only be used in conjunction with internal BGP (iBGP) sessions

The policy-statement command applies a metric value to BGP routes, overriding the default behavior

The route filtering policy is applied to incoming or outgoing BGP routes based on the defined conditions

Policy-statement commands are used exclusively for controlling the redistribution of BGP routes between different Autonomous Systems

30 / 60

When configuring a Juniper SRX device for transparent mode, which of the following statements is accurate regarding the device's functionality?

Transparent mode requires the SRX device to participate in Layer 2 forwarding and VLAN tagging

Transparent mode can only be used for VPN tunnel termination, and not for general network security

In transparent mode, the SRX device acts as a router and forwards packets between subnets based on Layer 3 information

The SRX device does not require any routing protocols to function in transparent mode, as it simply passes traffic between interfaces

31 / 60

A customer has two SRX devices that must work together in a high-availability (HA) configuration. The customer also wants to ensure that the active firewall performs session synchronization with the backup device. Which Junos feature should be used?

Virtual Router Redundancy Protocol (VRRP)

Clustered firewall session synchronization

Stateful failover

Active/Passive redundancy

32 / 60

Which of the following is true regarding the Junos OS concept of "logical systems"?

Logical systems are primarily used to implement Layer 3 VPN services in large-scale enterprise networks

Logical systems allow the creation of virtual routers, but they require a separate physical chassis for each instance

Each logical system is a completely independent instance of Junos OS, with its own configuration, routing table, and services

Logical systems can only be used in virtual chassis configurations and cannot be applied to standalone devices

33 / 60

Which of the following configurations is required for enabling Multicast in a Juniper router using PIM (Protocol Independent Multicast)?

The router must be configured to support the Anycast RP (Rendezvous Point)

PIM must be enabled globally and configured for each interface that participates in multicast routing

The router must be configured with an explicitly defined multicast forwarding table

The interface must be manually configured for IGMP (Internet Group Management Protocol)

34 / 60

When configuring a Juniper SRX device for IPsec VPN, which scenario would require the use of the "ike policy" command in the configuration?

When defining the pre-shared key for the IPsec tunnel

When setting the tunnel's source and destination IP addresses

When specifying the encryption algorithms to use for the tunnel

When configuring the VPN's authentication mechanism and the key exchange method

35 / 60

In a Junos OS configuration, when implementing a route filter using the policy-options statement, which of the following conditions will result in the route being accepted by the filter?

The route's prefix matches a defined policy but has a metric higher than the configured value

The route's AS path matches the defined regular expression and is preferred over other routes

The route's prefix matches the defined policy and the next-hop IP address matches the configured value

The route's AS path does not match the defined regular expression, but the metric is lower than the configured value

36 / 60

In which scenario would you typically configure a NAT policy on a Juniper SRX device?

When establishing a link-state database for OSPF

When configuring VLANs for internal network segmentation

When translating private IP addresses to public addresses for outbound traffic

When routing protocols need to be redistributed between two different areas

37 / 60

Which of the following is true about Juniper’s Dynamic VPN?

Dynamic VPN is intended for client-based VPN connectivity, where users connect to the network through a VPN gateway

It is a solution designed for setting up a static IPsec VPN between two devices

Dynamic VPN only supports IPsec and does not include any SSL or HTTPS capabilities

Dynamic VPN can only be used for site-to-site connections and not for remote access

38 / 60

In Juniper SRX devices, what is the main purpose of security zones?

To encrypt traffic between different devices within the same virtual private network

To ensure all routing protocols work efficiently between different physical locations

To map security policies to specific interfaces, allowing different trust levels to be assigned to each

To provide segmentation between different security policies within the same virtual system

39 / 60

Which of the following is a limitation of Virtual Chassis technology in Junos OS?

It only supports a maximum of 8 devices in a single chassis

Virtual Chassis does not support redundancy or failover between devices

It cannot support Layer 3 routing protocols across the devices in the chassis

All devices in the Virtual Chassis must be of the same model and hardware configuration

40 / 60

Which feature of Junos OS allows the network administrator to assign multiple IP addresses to a single physical interface?

IP Aliasing

Subnetting

Virtual Routers

Logical interfaces (also known as units)

41 / 60

When configuring an OSPF area on a Juniper router, what is the default OSPF area type?

Stub

Backbone

Normal

NSSA (Not So Stubby Area)

42 / 60

Which of the following would cause a VRRP virtual router to transition to the master state?

The backup router's interface is down

The master router sends a "Virtual Router Advertisement" (VRA)

The priority of the backup router is higher than that of the master

The master router fails to send "Advertisement" packets within the configured interval

43 / 60

In the Junos OS, which command will display the interface status, IP addresses, and statistics?

Show ip address

Show interface

Show system status

Show interfaces terse

44 / 60

What does the Juniper J-Series platform primarily focus on?

Acting as a comprehensive security solution for mid-size businesses

Delivering efficient service aggregation for service provider networks

Supporting virtualized networking environments in cloud-based infrastructures

Providing high-throughput, low-latency routing for large enterprise networks

45 / 60

Which of the following statements accurately describes the function of a Juniper SRX Series device in a network?

SRX Series devices can only function as routers and do not provide any firewall capabilities

SRX Series devices only support Layer 3 routing and do not support Layer 2 switching

The SRX Series device is a multi-functional device that provides routing, switching, and security services

The SRX Series device only functions as a firewall and cannot support routing protocols

46 / 60

You are creating an IP fabric underlay and want to use OSPF as your routing protocol. In this scenario, which statement is correct?

All spine devices must use the same router ID

All leaf devices must be configured in separate OSPF areas

Interface speeds should be the same throughout the fabric to ensure that all links are utilized

All leaf and spine devices must be the same model to ensure the proper load-balancing behavior

47 / 60

What is the default route preference of a static route in the Junos OS?

48 / 60

MACsec provides protection against which two types of threats? (Choose two.)

Hashing attacks, Man-in-the-middle attack

Data decryption, Hashing attacks

Playback attacks, Data decryption

Man-in-the-middle attack, Playback attacks

49 / 60

You want to minimize topology disruptions in your network when the rpd process restarts on a device. Which service would accomplish this task?

Virtual Chassis

Graceful restart (GR)

Link aggregation groups

Bidirectional Forwarding Detection (BFD)

50 / 60

Which statement is correct about member interfaces when creating a LAG?

Member interfaces must all be allocated on the same PFE

The interface's MTU settings must match on all member interfaces

The interface's duplex settings and link speed must be the same on all member interfaces

Member interfaces must all be allocated on the same chassis when using a Virtual Chassis

51 / 60

Within your router, you want to verify that you are learning routes from a remote BGP peer at IP address 10.10.100.1. Which command would satisfy the requirement?

show route advertise-protocol bgp 10.10.100.1

show route receive-protocol bgp 10.10.100.1

show route protocol bgp table inet.0 10.10.100.1

show route protocol bgp source-gateway 10.10.100.1

52 / 60

When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)

The port is disabled, No logging takes place

It drops the packet, The port is disabled

It causes Layer 2 loops, It drops the packet

No logging takes place, It causes Layer 2 loops

53 / 60

What information in the Ethernet header is used to populate the bridging table?

Type

Protocol

Source address

Destination address

54 / 60

Which statement is correct about an IRB interface?

An IRB interface switches traffic within the same VLAN

An IRB interface trunks together VLANs on different switches

An IRB interface is a physical Layer 3 interface that connects VLANs together

An IRB interface is a Layer 3 interface that can be used to route between VLANs

55 / 60

You want to enable a Junos device to support aggregated Ethernet interfaces. In this scenario, which configuration hierarchy would you use?

[edit system]

[edit chassis]

[edit interfaces]

[edit switch-options]

56 / 60

What is the primary purpose of an IRB Layer 3 interface?

To provide port security

To provide load balancing

To provide a default VLAN ID

To provide inter-VLAN routing

57 / 60

Which Junos OS routing table stores IPv6 addresses?

inet6.0

inet.0

inet.6

inet0.6

58 / 60

Which statement is correct about aggregate routes?

The default next hop is resolve

The default next hop is discard

The default next hop is reject

The default next hop is readvertise

59 / 60

When troubleshooting an OSPF neighborship, you notice that the router stopped at the ExStart state. What is the cause of this result?

The priority is set to 255

There is an MTU mismatch

There is an area ID mismatch

There is an interval timing mismatch

60 / 60

Leaf and spine data centers are used to better accommodate which type of traffic?

East-west

North-west

North-east

South-east

Your score is

The average score is 0%

By Wordpress Quiz plugin

Free JN0-280 Practice Test – 2025 Updates

Prepare Smarter for the JN0-280 Exam with Our Free and Accurate JN0-280 Exam Questions – Updated for 2025.

Disclaimer

[email protected]

Helpful links

top Vendors

Contact Us

[email protected]

FLASH OFFER

avail $6 DISCOUNT on YOUR PURCHASE