100+ Free Nokia NRS I Practice Questions

Pass your Nokia Network Routing Specialist I exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

Not published Pass Rate

100+ Questions

100% Free

1 / 100

Question 1

Score: 0/0

Which layer of the TCP/IP model is responsible for end-to-end delivery between application processes using ports?

Transport

Network

Data link

Application

to track

2026 Statistics

Key Facts: Nokia NRS I Exam

Exam Questions

Nokia 4A0-100 exam profile

75 min

Exam Duration

Nokia 4A0-100 exam profile

80%

Passing Score

Nokia SRC scoring policy

$125

Exam Fee (USD)

Pearson VUE Nokia pricing

Pearson VUE

Test Provider

Nokia SRC delivery partner

3 years

Credential Validity

Nokia SRC recertification policy

Nokia Network Routing Specialist I (NRS I) is a 60-question, 75-minute multiple-choice exam delivered through Pearson VUE for $125 USD. Candidates must score 80% or higher and the credential is valid for 3 years. The exam, code 4A0-100 (IP Networks and Services Fundamentals, formerly Scalable IP Networks), covers the TCP/IP layered model, Ethernet, IPv4 addressing, IP forwarding, OSPF, IS-IS, BGP, MPLS LDP and RSVP-TE, Layer 3 (VPRN, IES) and Layer 2 (VPLS, VLL) services, QoS basics, and Nokia SR OS CLI on the 7750 SR and 7705 SAR.

Sample Nokia NRS I Practice Questions

Try these sample questions to test your Nokia NRS I exam readiness. 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

The Nokia NRS I (exam 4A0-100, IP Networks and Services Fundamentals) is the entry credential of the Nokia Service Routing Certification (SRC) program. It validates fundamentals of TCP/IP, Ethernet, IPv4 addressing, packet forwarding, routing protocols (OSPF, IS-IS, BGP), MPLS tunnelling, and VPN services (VPRN, IES, VPLS, VLL) on Nokia 7750 SR and 7705 SAR routers running SR OS.

Questions

60 scored questions

Time Limit

75 minutes

Passing Score

80%

Exam Fee

$125 (Nokia / Pearson VUE)

Nokia NRS I Exam Content Outline

20%

TCP/IP, Ethernet, and IPv4 Fundamentals

TCP/IP layered model, Ethernet framing and switching, IPv4 addressing and subnetting, ARP, and the role of the data link and network layers.

20%

Packet Forwarding and Routing Protocols

IP forwarding, longest-prefix match, static routes, OSPF and IS-IS link-state operation, and BGP path selection in service-provider networks.

15%

MPLS and Label-Switched Paths

MPLS label structure, push/swap/pop and PHP behavior, LDP signaling, RSVP-TE LSPs, and the relationship between IGP, MPLS, and services.

20%

VPN Services on Nokia SR OS

Service architecture (SAP, SDP, customer), Layer 3 VPRN and IES services, Layer 2 VPLS, and point-to-point VLLs (Epipe, Apipe, Cpipe, Ipipe).

15%

Nokia SR OS CLI and Management

Classic CLI navigation, MD-CLI introduction, configuration and operational commands on the 7750 SR / 7705 SAR, and interpretation of show output.

10%

QoS, Multicast, and Network Resiliency

Forwarding classes, queues, policers and schedulers, IP multicast (PIM-SM, IGMP), and high-availability concepts on Nokia routers.

How to Pass the Nokia NRS I Exam

What You Need to Know

Passing score: 80%
Exam length: 60 questions
Time limit: 75 minutes
Exam fee: $125

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Nokia NRS I Study Tips from Top Performers

1Build muscle memory with Nokia SR OS classic CLI and MD-CLI: practice navigating configure, show, admin, and tools branches and reading 7750 SR command output.

2Drill the MPLS label lifecycle until push, swap, pop, and penultimate-hop popping are second nature - many NRS I scenario questions hinge on which router performs which label action.

3Lock in the difference between LDP (best-effort, IGP-shadow) and RSVP-TE (signaled, traffic-engineered) LSPs and understand when each is used as a service transport tunnel.

4Practice mapping a customer service end to end: customer + SAP on the access port + SDP across the MPLS core + matching service ID on the egress PE.

5Memorize which service is which: VPRN (Layer 3 IP-VPN), IES (Internet-facing Layer 3), VPLS (multipoint Layer 2), Epipe/Apipe/Cpipe/Ipipe (point-to-point Layer 2 VLLs).

6Be fluent in IS-IS Level 1 vs Level 2 areas, OSPF area types, and BGP IBGP-versus-EBGP behavior, including next-hop and full-mesh requirements.

7Know the SR OS forwarding-class model (NC, H1, EF, H2, L1, AF, L2, BE) and how queues, policers, and schedulers shape service traffic.

8Run timed full-length 60-question mock exams and review every wrong answer; target 85% or higher in practice before booking the live 4A0-100 attempt.

Frequently Asked Questions

What is on the Nokia NRS I exam?

Nokia NRS I (exam code 4A0-100, IP Networks and Services Fundamentals) tests fundamentals of TCP/IP, Ethernet, IPv4 addressing and subnetting, IP forwarding and routing (OSPF, IS-IS, BGP), MPLS label operations and signaling (LDP, RSVP-TE), Layer 3 services (VPRN, IES), Layer 2 services (VPLS, VLL: Epipe/Apipe/Cpipe/Ipipe), basic QoS, IP multicast, and the Nokia SR OS command line on the 7750 SR and 7705 SAR. It is the equivalent service-provider entry credential to Cisco CCNA, Juniper JNCIA, and Huawei HCIA.

How long is the exam and how many questions does it have?

Nokia NRS I is a 60-question multiple-choice exam with a 75-minute test time. The full Pearson VUE appointment is around 120 minutes because Nokia adds a 45-minute pre-exam tutorial covering the computer-based-test interface.

What is the passing score for NRS I?

Nokia requires an 80% score to pass NRS I. Treat that as a hard floor and aim higher in practice exams, since service-provider topics like MPLS label operations and VPRN/VPLS service modeling tend to drive most candidate failures.

How much does the NRS I exam cost?

The 4A0-100 exam fee is $125 USD per attempt, paid to Pearson VUE at registration. Optional Nokia self-paced or instructor-led training is sold separately and is not required to sit the exam.

How long is the NRS I credential valid?

Nokia SRC credentials, including NRS I, are valid for three years. To stay current, candidates must pass any current SRC exam (NRS I, NRS II, or a higher-level exam) within the three-year window or recertify by retaking 4A0-100.

Are there prerequisites for NRS I?

There are no formal prerequisites for NRS I, but candidates are expected to be comfortable with TCP/IP, IPv4 addressing, and Ethernet before sitting 4A0-100. Nokia recommends, but does not require, the IP Networks and Services Fundamentals self-paced or instructor-led course.