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JNCIS-ENT · domain

Protocol Independent Routing

This domain covers Junos routing that is not tied to a single dynamic protocol: static and aggregate routes, filter-based forwarding, routing instances, and route validity conditions. Questions present configuration or show-route scenarios and ask why a route is inactive or traffic is misrouted.

37 questions11 easy15 medium11 hard

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What this domain covers

What to know about Protocol Independent Routing

Be able to read a Junos routing table and configuration and explain why a static, aggregate, or filter-based forwarding route is or is not active. The key is verifying next-hop resolution and, for aggregates, the presence of contributing routes before expecting installation.

Static route activation using qualified-next-hop, preference, and resolve/retain options

Aggregate and generated route behavior, including contributing routes and discard next-hops

Filter-based forwarding with firewall filters and virtual-router routing instances

Recursive next-hop resolution and tracked objects or RPM ping tests for route validity

Watch out for

Common Protocol Independent Routing exam traps

  • ▸Assuming an aggregate route is active without a contributing more-specific route, or forgetting that aggregate routes are inactive until a contributor exists.
  • ▸Applying the firewall filter for filter-based forwarding without the routing-instance action or on the wrong interface direction.
  • ▸Expecting a static route with an indirect next-hop to install when the recursive next-hop is unresolvable in inet.0.

Question index

All Protocol Independent Routing questions (37)

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1

When configuring a routing instance of type 'virtual-router', which THREE characteristics apply? (Choose three)

Hard
2

You need to ensure that traffic entering interface ge-0/0/1 is forced into a specific forwarding routing instance named 'corp-fwd', regardless of the destination IP address in the packet header. Which configuration steps must you perform?

Medium
3

You have configured a qualified next-hop for a static route to 10.1.1.0/24 with a primary next-hop of 192.168.1.1 and a qualified next-hop of 192.168.1.2. Both next-hops are reachable. Under what condition will the qualified next-hop be used?

Hard
4

An engineer needs to configure a static IPv4 route on a Juniper Networks MX Series router pointing traffic destined for 192.168.100.0/24 to next-hop 10.0.0.1. Which configuration accomplishes this task?

Easy
5

An engineer is configuring a static route with multiple qualified next hops to provide load balancing and redundancy. Which TWO statements are true regarding qualified next hops in Junos? (Choose two.)

Medium
6

You need to configure filter-based forwarding (FBF) to route traffic from a specific subnet (192.168.1.0/24) through an alternate next-hop gateway. Which components are required to implement this successfully?

Medium
7

You are configuring a virtual router routing instance on a Juniper device to isolate traffic for a specific department. Which routing-instance type should you select?

Easy
8

You are configuring Filter-Based Forwarding (FBF) on an interface. You apply a firewall filter that matches specific source addresses and uses 'then routing-instance' as an action. What must be configured in that target routing instance to ensure return traffic is handled correctly?

Medium
9

An administrator configures filter-based forwarding. The firewall filter uses the action 'then routing-instance custom-vr'. Where must the custom-vr routing instance be defined for the filter to accept this configuration without committing errors?

Hard
10

Which routing-instance type is specifically designed to support Layer 3 VPNs (L3VPNs) utilizing BGP as the-peering protocol and MP-BGP for VPN route distribution?

Easy
11

An administrator has configured a forwarding-type routing instance to perform filter-based forwarding. Which configuration statement is mandatory under the routing-instances hierarchy to properly define this instance type?

Hard
12

What is the primary function of a Junos routing instance of type 'forwarding'?

Easy
13

Which TWO attributes distinguish direct routes from static routes in Junos OS? (Choose two)

Medium
14

You are troubleshooting an aggregate route that is not being advertised to BGP peers. You verify that contributing routes are active in the routing table. What command should you use to check if the aggregate route itself is successfully generated and active in the local routing table?

Medium
15

Which statement best describes the behavior of a local route in Junos OS?

Easy
16

You have configured a static route with a next-hop of 10.0.0.1 and a preference of 10. Another static route to the same destination has a next-hop of 10.0.0.2 and a preference of 5. Both next-hops are reachable. Which route will be active in the routing table?

Medium
17

You want to ensure that a static route is only installed in the routing table when a specific tracked object or ping test succeeds. Which Junos feature should you pair with the static route?

Medium
18

An engineer configures multiple static routes to the same destination with different preference values. When all paths are up, how does Junos select which route is active in the routing table?

Hard
19

Which TWO parameters can be modified within a static route configuration to control path selection and backup behavior? (Choose two)

Medium
20

An engineer configures an aggregate route for 172.16.0.0/16 on a Junos device. However, the aggregate route is not active in the routing table. What is the primary requirement for an aggregate route to become active?

Hard
21

An administrator configures a static route with a next-hop that points to an indirect (recursive) address. What condition must be met for this static route to become active in the inet.0 routing table?

Hard
22

When configuring load balancing in Junos OS, which THREE header fields can be included in the hashing algorithm to compute the ECMP path? (Choose three)

Hard
23

Which command is used to display all configured static routes along with their active/inactive status in Junos?

Easy
24

An administrator wants to configure load balancing across multiple static routes. Which THREE configuration elements are required to successfully implement ECMP load balancing for static routes in Junos? (Choose three)

Hard
25

Which TWO statements accurately describe the behavior and characteristics of a routing instance of type 'forwarding'? (Choose two)

Medium
26

What is the default preference value for a direct route in Junos OS?

Easy
27

An administrator implements filter-based forwarding and applies a firewall filter on the ingress interface. However, traffic matching the filter is dropped rather than routed to the alternate routing instance. Upon investigation, what is the most likely cause of this issue?

Hard
28

You are configuring a static route to a destination and want to ensure that the route is not redistributed into OSPF. Which configuration statement should you use?

Medium
29

An engineer is configuring static routes in Junos OS and wants to ensure high availability. Which TWO features can be implemented with static routes to achieve path redundancy? (Choose two)

Medium
30

Which command allows you to inspect the active forwarding table entries and verify next-hops on a Junos router?

Easy
31

When configuring a routing instance of type 'virtual-router', what is required to allow communication between the virtual router instance and the default routing instance?

Easy
32

By default, what is the Junos routing protocol preference value assigned to static routes?

Easy
33

When configuring Filter-Based Forwarding (FBF), which THREE components are absolutely mandatory for successful operation? (Choose three)

Hard
34

Which Junos routing instance type is best suited when you want to run MPLS L3VPNs on a Provider Edge (PE) router?

Easy
35

You have configured multiple static routes to the same destination with different preference values. When does Junos install a static route into the forwarding table (FIB)?

Medium
36

You are configuring a static route on a Junos device to a remote network reachable via a point-to-point interface. After committing, you notice the route appears in the routing table but is marked as hidden. Which of the following is the most likely cause?

Medium
37

You need to configure a static floating route that will only become active if the primary dynamic route learned via OSPF fails. Which configuration parameter must be adjusted to achieve this behavior?

Medium

Frequently asked questions

What does the Protocol Independent Routing domain cover on the JNCIS-ENT exam?
Be able to read a Junos routing table and configuration and explain why a static, aggregate, or filter-based forwarding route is or is not active. The key is verifying next-hop resolution and, for aggregates, the presence of contributing routes before expecting installation.
How many questions are in this domain?
This page lists all 37 Protocol Independent Routing questions in the JNCIS-ENT question bank. The actual exam draws from this domain proportionally to its weighting in the official exam blueprint.
What is the best way to practise this domain?
Start with a short focused session (10 questions) to identify gaps, then work through explanations. Repeat with a longer session once the weak areas feel solid.
Can I practise only Protocol Independent Routing questions?
Yes — the session launcher on this page filters questions to this domain only. Choose any session length for inline explanations and scoring.
Juniper Networks Enterprise Routing and Switching, Specialist (JNCIS-ENT, JN0-352) (JNCIS-ENT) Protocol Independent Routing Practice Questions