10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The NRS I exam has 40 questions and runs 90 minutes.
These 10 free NRS I questions are organized by exam domain, so you can see how each part of the Nokia Network Routing Specialist I blueprint is tested. Reveal the answer and explanation under each question.
A workstation at 10.38.6.25/24 sends off-subnet traffic through router 10.38.6.1. It opens a connection to a server at 198.51.100.40. No address translation or tunneling is involved. For an IPv4 packet transmitted toward the server, what destination IP address and destination Ethernet MAC address does the workstation use, respectively?
Correct answer: B - Server IP address; router's LAN MAC address.
On an SR OS router using MD-CLI, auto-config-save is false. In an exclusive configuration session, an engineer changes an interface description, runs validate successfully, and then runs /admin save without errors. No commit has occurred. What remaining sequence makes the edited description active and saves it at the configured startup location?
Correct answer: A - Commit the candidate, then run /admin save.
A switch has ports 1, 2, and 3 in VLAN 40 and port 4 in VLAN 50. The switch maintains a separate MAC forwarding table for each VLAN. All four ports are forwarding, and no filtering or flood suppression is configured. A unicast frame enters port 1 in VLAN 40. Its destination MAC is learned on port 4 in VLAN 50, but there is no entry for that MAC in VLAN 40. Where should the switch send the frame?
Correct answer: C - Ports 2 and 3 only.
An Ethernet link is operating at 1,000 Mbit/s full duplex. During the same monitoring interval, transmit traffic averages 720 Mbit/s and receive traffic averages 680 Mbit/s. A dashboard adds the readings and raises a "140% utilization" alarm. No frame errors or queue drops were recorded. What conclusion belongs in the operations handover?
Correct answer: B - Assess each direction separately; their sum does not establish link overload.
Immediately after a second Ethernet link is enabled between two access switches, customers in their shared VLAN lose connectivity. The switches report rapid source-MAC moves between the links and repeated copies of broadcast frames. Neither link is controlled by spanning tree, and the links are not members of a LAG. Independent management access remains available. What should the on-call engineer do first to contain the outage?
Correct answer: A - Disable the newly added link to break the Layer 2 loop.
The following IPv4 routes are installed on a Nokia router. Every next hop is resolved and usable, and no policy-based routing applies. 0.0.0.0/0 - static, preference 5, next hop 192.0.2.1 10.72.0.0/16 - static, preference 5, next hop 192.0.2.2 10.72.18.0/24 - OSPF, preference 10, next hop 192.0.2.3 10.72.18.128/25 - BGP, preference 170, next hop 192.0.2.4 Which next hop receives a packet addressed to 10.72.18.173?
Correct answer: D - 192.0.2.4
A site owns 10.24.8.0/24. Existing networks occupy 10.24.8.0/26 and 10.24.8.128/25. A new VLAN needs addresses for 45 workstations and one router interface; no other addresses must be reserved. Which proposed router address and prefix provide enough usable addresses without overlapping either existing network?
Correct answer: D - 10.24.8.70/26
The two usable BGP advertisements for an IPv4 prefix differ as follows: West: LOCAL_PREF 180; AS-path length 3. East: LOCAL_PREF 120; AS-path length 1. On this Nokia router, both next hops are reachable and all other best-path selection criteria are equal. Which path wins the comparison?
Correct answer: B - West wins because LOCAL_PREF is compared before AS-path length.
Two unrelated customers buy connectivity between their branch offices. Each customer uses different subnets at its own sites, but the two customers reuse the same address ranges. The provider must route between each customer's sites while keeping the customers' routing tables separate. Choose the service architecture that satisfies both requirements.
Correct answer: C - Separate VPRNs, with an independent routing table for each customer.
A transit MPLS router receives a packet with transport label 16040 on top of service label 24017. Its label-forwarding table contains these entries: Incoming 16040 -> outgoing 16092, interface core-2 Incoming 24017 -> outgoing 24088, interface core-3 Both entries specify label replacement, not popping or adding a label. Select the label stack, top to bottom, on the forwarded packet.
Correct answer: A - 16092, 24017
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