How should I use these Protocol Independent Routing practice questions?

Read each scenario carefully and choose your answer before revealing the explanation. Then check why your choice was right or wrong. Repeat until the reasoning feels automatic.

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Yes — use the session launcher on this page to start a 10-, 20-, 30- or 50-question session drawn entirely from the Protocol Independent Routing domain.

JNCIS-ENT · topic practice

Protocol Independent Routing practice questions

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.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Editorial oversight:Johnson Ajibi· MSc IT Security, IEEE Senior Member

20 questionsDomain: Protocol Independent Routing

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What the exam tests

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.

Practice set

Protocol Independent Routing questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice

Review the full routing breakdown →

You need to create a virtual router routing instance to isolate traffic for a specific department. Which routing-instance type should you configure in the Junos configuration?

Trap 1: forwarding

A forwarding instance is used strictly for filter-based forwarding and does not run independent routing protocols.

Trap 2: no-structural-instance

This is not a valid Junos routing instance type.

Trap 3: l2vpn

An L2VPN instance is used for Layer 2 Virtual Private Networks.

Study all Protocol Independent Routing common traps →

A
forwarding
Why it fails: A forwarding instance is used strictly for filter-based forwarding and does not run independent routing protocols.
B
virtual-router
A virtual-router routing instance creates a separate routing table and protocol process, isolating the department's traffic from the master instance. Unlike VRF or VPLS types, it needs no interface-based RIB groups, satisfying the isolation requirement without extra configuration.
C
no-structural-instance
Why it fails: This is not a valid Junos routing instance type.
D
l2vpn
Why it fails: An L2VPN instance is used for Layer 2 Virtual Private Networks.

Protocol Independent Routing practice questions

What to know about Protocol Independent Routing

Common Protocol Independent Routing exam traps

Protocol Independent Routing questions

You need to create a virtual router routing instance to isolate traffic for a specific department. Which routing-instance type should you configure in the Junos configuration?

An administrator configures an aggregate route for 172.16.0.0/16. However, no contributing routes are present in the routing table. What is the default behavior of this aggregate route in Junos OS?

You are configuring an aggregate route and want to ensure that a discard next-hop is automatically applied when there are no contributing routes, preventing routing loops. Which configuration statement should you use under routing-options?

When configuring load balancing on a Junos device, you want to include Layer 4 source and destination ports in the hash calculation to achieve finer-grained load distribution. Which configuration statement achieves this under the forwarding-options hierarchy?

You are troubleshooting a load-balancing configuration across multiple equal-cost paths (ECMP) on a Juniper MX Series router. Traffic is hashing persistently onto only one link. Which action should you take to enable per-packet or per-flow load balancing across the ECMP paths?

What is the key difference between a 'discard' static route and a 'reject' static route in Junos OS?

You need to configure a static route that acts as a discard route, ensuring that any traffic destined for a specific unassigned subnet is silently dropped. Which configuration syntax should you use?

You are configuring a qualified next-hop for a static route in Junos to provide redundancy. Which parameter allows you to specify a secondary next-hop with a different preference value?

An engineer configures a static route pointing to an interface rather than an IP address. What potential issue can occur with interface-based static routes on multi-access Ethernet networks in Junos OS?

You configure an aggregate route and want to control which specific attributes or policies are applied when the aggregate is advertised by BGP. Which routing option is used to assign a specific contributing route tag or policy to an aggregate route?

You need to verify that load balancing is functioning properly across your core interfaces and wish to see the specific hash buckets assigned in the forwarding table. Which command should you execute?

You have configured load balancing across two uplinks using a routing policy. After committing the configuration, you notice that traffic is still exiting only via the primary link. What missing command under forwarding-options is necessary to activate the policy for forwarding table generation?

You want to configure load balancing across four distinct next-hops. By default, how many paths will Junos install into the forwarding table for ECMP if you configure a load-balancing policy without specifying path limits?

You need to isolate a set of interfaces into a separate routing table without running dynamic routing protocols inside that table. Which routing instance type should you deploy?

Which command verifies the interface bindings associated with a specific routing instance named 'engineering'?

Which TWO routing instance types support running dynamic interior routing protocols like OSPF and IS-IS within Junos OS? (Choose two)

An administrator is troubleshooting an aggregate route that is missing from the routing table. Which THREE conditions could cause an aggregate route to remain inactive? (Choose three)

Which TWO actions occur when a packet matches a static route configured with the 'reject' parameter? (Choose two)

Which TWO commands can be used to inspect static routes or verify their status in Junos OS? (Choose two)

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Frequently asked questions

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Study resources

Exam traps to avoid