4A0-C03 Practice Tests: Master the Nokia NRS II Composite Exam: IS-IS Version Exam in 2026

Preparing for the Nokia NRS II Composite Exam: IS-IS version (4A0-C03) exam can be smarter with DumpsBase. We offer the latest 4A0-C03 practice tests with 70 exam questions and answers, which streamline your learning process, ensuring you enter the examination room fully equipped to earn your certification.

What is Nokia 4A0-C03 Exam?

The 4A0-C03 Nokia NRS II Composite Exam: IS-IS version is a professional-level networking certification exam designed for engineers who want to earn the Nokia Network Routing Specialist II (NRS II) certification. It combines four separate written exams into a single composite exam, making it a more streamlined path toward NRS II certification:

1. 4A0-112 Nokia IS-IS Routing Protocol
2. 4A0-114 Nokia Border Gateway Protocol Fundamentals for Services
3. 4A0-103 Nokia Multiprotocol Label Switching (MPLS)
4. 4A0-104 Nokia Services Architecture

It focuses on Nokia Service Router (SR OS) technologies, routing protocols, MPLS-based service provider networks, and network service architectures.

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Free 4A0-C03 Practice Demo Questions

Below are 5 free demo questions to help you preview the practice tests:

Question 1:

In a Nokia SR OS VPRN (Layer 3 VPN) service, what is the primary technical purpose of the Route Distinguisher (RD)?
A. It dictates the import and export policies for the local VRF routing table.
B. It ensures that overlapping IP prefixes from different customers remain unique within the provider’s BGP core.
C. It determines the inner MPLS service label that is pushed onto the customer payload.
D. It prevents routing loops when acting as a Route Reflector in a hub-and-spoke topology.
Answer: B
Explanation:
RDs are pre-pended to IPv4/IPv6 addresses to create VPN-IPv4/VPN-IPv6 addresses, making non-unique customer IP prefixes globally unique within the MP-BGP core. Route Targets (RTs) handle the import/export policies (Option A).

Question 2:

When configuring an RSVP-TE LSP with CSPF (Constrained Shortest Path First) enabled, which of the following constraints CANNOT be natively evaluated by the CSPF algorithm?
A. Administrative groups (Color/Affinities)
B. Hop count limits
C. Available link bandwidth
D. LDP synchronization state
Answer: D
Explanation:
CSPF dynamically calculates paths across the TE topology database based on metrics like Bandwidth, Admin Groups (Colors), Hop Limits, and TE metrics. LDP synchronization is a local IGP interaction and is not a constraint evaluated by the CSPF algorithm.

Question 3:

In a BGP Route Reflector topology, how does a Route Reflector primarily prevent routing loops when reflecting routes to its clients?
A. By modifying the NEXT_HOP attribute to its own System IP address.
B. By utilizing the ORIGINATOR_ID and CLUSTER_LIST attributes.
C. By appending its own Autonomous System number to the AS_PATH attribute.
D. By setting the LOCAL_PREF attribute to zero for all reflected routes.
Answer: B
Explanation:
Route Reflectors use two specific BGP attributes for loop prevention within an AS: ORIGINATOR_ID (the Router ID of the router that originated the route into the local AS) and CLUSTER_LIST (a list of RR cluster IDs the route has passed through).

Question 4:

Which of the following are valid port encapsulation types supported on a Nokia Service Router for configuring Service Access Points (SAPs)? (Choose two)
A. Q-in-Q (qinq)
B. GRE (Generic Routing Encapsulation)
C. Null
D. IPsec
Answer: A, C
Explanation:
On SR OS, null, dot1q, and qinq are the standard Ethernet port encapsulations used to define how SAPs accept traffic. GRE and IPsec are tunnel protocols or SDP types, not physical port encapsulations for SAPs.

Question 5:

An IS-IS L1/L2 router receives a Level 1 LSP from an adjacent neighbor. How does it handle this LSP by default?
A. It translates the Level 1 LSP into a Level 2 LSP and floods it to the Level 2 backbone.
B. It floods the Level 1 LSP only within the local Level 1 area.
C. It forwards the LSP directly to the designated Level 2 Route Reflector.
D. It drops the LSP silently if the Attached (ATT) bit is not set.
Answer: B
Explanation:
In IS-IS, Level 1 LSPs are restricted to the local L1 area database. While an L1/L2 router will inject L1 routing information into the L2 backbone as leaf prefixes (route leaking), it does NOT flood the actual L1 LSP into the L2 area.

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