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Exam Review

Key Facts: Nokia NRS I Exam

40

Exam Questions

Nokia 4A0-100 exam profile

90 min

Testing Time

Nokia 4A0-100 exam profile

$125 USD

Listed Exam Price

Nokia 4A0-100 exam profile

Pearson VUE

Written Test Delivery

Nokia SRC exam policy

3 years

Certification Validity

Nokia SRC recertification policy

The current Nokia 4A0-100 exam has 40 multiple-choice questions, 90 minutes of testing, and a listed price of $125 USD. Nokia’s public exam profile does not specify a passing score. The current OSPF-based version ends February 8, 2027; a blackout runs February 9-March 8, with revised SR OS and new SR Linux exams opening March 9, 2027.

Sample Nokia NRS I Practice Questions

Try these sample questions to review concepts for the Nokia NRS I exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which layer of the TCP/IP model is responsible for end-to-end delivery between application processes using ports?
A.Transport
B.Network
C.Data link
D.Application
Explanation: The transport layer (TCP and UDP) provides end-to-end delivery between application processes and uses port numbers to multiplex flows. The network layer handles host-to-host addressing with IP, the data link layer handles framing on a single segment, and the application layer hosts protocols like HTTP and DNS that ride on top of transport.
2How many usable host addresses are available in an IPv4 /27 subnet?
A.30
B.32
C.62
D.14
Explanation: A /27 subnet has 32 minus 27 equals 5 host bits, giving 2^5 = 32 total addresses. Subtract the network and broadcast addresses to get 30 usable hosts. /28 has 14 hosts, /26 has 62 hosts.
3Which protocol resolves an IPv4 next-hop address to a destination MAC address on an Ethernet segment?
A.ARP
B.DHCP
C.ICMP
D.DNS
Explanation: The Address Resolution Protocol (ARP) maps an IPv4 address on the local subnet to the corresponding Ethernet MAC address so the router or host can frame the packet. DHCP assigns IP addresses, ICMP is used for control messages like ping, and DNS resolves names to IP addresses.
4What is the size of a standard Ethernet frame's destination MAC address field?
A.6 bytes
B.4 bytes
C.8 bytes
D.2 bytes
Explanation: Ethernet MAC addresses are 48 bits, which is 6 bytes. Both the destination and source MAC fields in an Ethernet header are 6 bytes each. IPv4 addresses are 4 bytes, IPv6 are 16 bytes, and the EtherType field is 2 bytes.
5On an IPv4 router, which forwarding decision rule is used when multiple routes exist for the same destination?
A.Longest-prefix match
B.First match in the configuration order
C.Lowest interface index
D.Highest administrative distance
Explanation: Routers select the route with the most specific (longest) matching prefix when multiple entries cover a destination, regardless of how the route was learned. Configuration order, interface index, and administrative distance influence other choices but do not override longest-prefix match.
6Which OSI / TCP/IP layer is most associated with MAC addressing and Ethernet switching?
A.Data link
B.Network
C.Transport
D.Physical
Explanation: MAC addressing and Ethernet switching live at the data link layer (Layer 2). The network layer (Layer 3) deals with IP addressing, the transport layer with end-to-end ports, and the physical layer with cabling, signaling, and bit transmission.
7Which of the following is a private IPv4 address range reserved by RFC 1918?
A.10.0.0.0/8
B.172.32.0.0/12
C.192.169.0.0/16
D.224.0.0.0/4
Explanation: RFC 1918 reserves three private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. 172.32.0.0/12 is outside the 172.16-172.31 reserved range, 192.169.0.0/16 is outside the 192.168 reservation, and 224.0.0.0/4 is the IPv4 multicast range.
8Which IPv4 address class historically covered the range 128.0.0.0 through 191.255.255.255?
A.Class B
B.Class A
C.Class C
D.Class D
Explanation: Classful IPv4 used Class A 1-126, Class B 128-191, Class C 192-223, Class D 224-239 (multicast), and Class E 240-255 (experimental). Modern routing is classless (CIDR), but the NRS I blueprint still expects candidates to recognize the original ranges.
9What is the default Ethernet payload MTU usually assumed for end-to-end IPv4 packet transit on a standard LAN?
A.1500 bytes
B.1492 bytes
C.9000 bytes
D.576 bytes
Explanation: Standard Ethernet MTU is 1500 bytes, which is the default IP payload size assumed by most operating systems and routers. PPPoE reduces this to 1492, jumbo frames go up to 9000, and 576 is the IPv4 minimum reassembly buffer size, not the MTU.
10Which TCP feature allows two endpoints to detect dropped or out-of-order segments?
A.Sequence numbers
B.Port numbers
C.Window scaling option
D.TTL field
Explanation: TCP sequence numbers tag every byte so the receiver can detect missing or reordered segments and signal the sender via cumulative or selective acknowledgements. Port numbers identify endpoints, window scaling allows larger windows, and TTL is an IP header field unrelated to TCP ordering.

About the Nokia NRS I Exam

NRS I is Nokia’s entry-level Service Routing Certification. Passing the current 4A0-100 IP Networks and Services Fundamentals written exam earns the credential. Its course covers networking models, 7750 hardware and MD-CLI, Ethernet, IP, static routing, OSPF, basic BGP, MPLS/LDP, and VPN services.

Exam sponsor: Nokia / Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

40 questions

Time Limit

90 minutes

Passing Score

Not specified on public exam profile

Exam / Certification Fees

$125

Exam sponsor website

Reported exam pass rate: Not published. Nokia does not publish exam-level pass rates Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Networking and Services

Layered models, encapsulation, and control versus data plane functions.

Not published

Service Router Components and CLI

Router roles, 7750 components, boot sequence, and SR OS management using MD-CLI.

Not published

Ethernet

Medium access, switching, MAC addressing, VLANs, redundancy, and frame fields.

Not published

Internet Layer

Address planning, summarization, routed interfaces, forwarding, IP headers, and small-network connectivity.

Not published

Routing Basics

Static routes, OSPF, introductory BGP, and the components of the Internet.

Not published

Services

VPN choices, MPLS transport, LDP, service building blocks, and VPWS/VPLS/VPRN configuration.

Preparing for the Nokia NRS I Exam

What You Need to Know

  • Passing score: Not specified on public exam profile
  • Exam length: 40 questions
  • Time limit: 90 minutes
  • Exam / certification fees: $125 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Nokia NRS I: Suggested Study Strategy

1Use the current official module outline as a checklist; do not assign invented percentage weights.
2Practice MD-CLI candidate edits, compare, validation, commit, and configuration persistence.
3Calculate network boundaries, host ranges, and exact route summaries before checking an answer.
4Trace customer packets through SAP, service, transport label, and remote service demultiplexing.
5Separate link LDP transport labels, targeted-LDP pseudowire labels, and MP-BGP VPN labels.
6Use 40-question, 90-minute practice sessions as a pacing exercise; practice results do not guarantee a live-exam score.
7Confirm the applicable outline if testing during or after the February-March 2027 transition.

Frequently Asked Questions

What is the current Nokia NRS I exam format?

Nokia lists 40 questions, 90 minutes of testing, a 110-minute appointment including a 20-minute introductory survey, and English-language delivery for 4A0-100. Its public exam profile does not specify a passing score; confirm scoring requirements with Nokia rather than assuming the NRS II lab pass mark applies.

How much does 4A0-100 cost and where is it taken?

Nokia lists $125 USD for the exam. Pearson VUE delivers written exams online and at test centers where available. Check the appointment’s local pricing, identification rules, and delivery restrictions before booking.

Which topics belong to the current exam?

Nokia directs candidates to its course objectives and modules: networking models, 7750 hardware and MD-CLI management, Ethernet, Internet-layer operation, static routing, OSPF, introductory BGP, MPLS/LDP, and VPN service configuration. Nokia does not publish percentage weights for these modules.

Are there prerequisites for NRS I?

The 4A0-100 profile lists no mandatory prerequisites. Passing this written exam earns NRS I. Training is optional; binary arithmetic and basic Ethernet/IP knowledge are useful preparation.

How long is NRS I valid?

Nokia SRC certifications are valid for three years. NRS I can be renewed by retaking the active NRS I exam or passing another active SRC exam under Nokia’s recertification policy.

Is there a waiting period after failing the written exam?

Nokia states that failed written exams have no required retake waiting period and no limit on rewrites. This written-exam policy is different from the practical lab retake policy. Availability and registration charges still apply.

When does the NRS I exam change?

Nokia’s September 8, 2026 announcement keeps the current OSPF-based 4A0-100 available through February 8, 2027. The exam is unavailable February 9-March 8. Revised SR OS 4A0-100 and new SR Linux 4A0-S01 exams open March 9, 2027, adding IS-IS, Segment Routing, and EVPN content. Recheck the official outline for an appointment after the transition.