About the Exam

This is a Nokia written exam covering IS-IS routing protocol topics within the Service Routing Certification program. It is one of the mandatory multiple-choice exams for the NRS II certification and also counts toward the SRA certification. Passing demonstrates knowledge of Nokia’s IS-IS routing protocol at the level required for those certification tracks.

Exam Topics

Introduction to Security25%
SR OS Management Plane Security25%
SR OS Control Plane Security25%
SR OS Data Plane Security25%

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Last updated July 17, 2026 at 8:49 PM

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QuestionQ1

Introduction to Security

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All routers in the diagram run an interior gateway protocol (IGP) and are configured with an ECMP value of 4. Router R5 advertises the prefix 192.168.3.0/24 through the IGP. Assuming every link has the same cost, how many entries for prefix 192.168.3.0/24 will be present in router R3’s routing table?

Explanation

R3 has two equal-cost shortest paths to 192.168.3.0/24, through R1 and through R2. Each path reaches R5 in two equal-cost links. Routes through R4 have a higher total cost, so they are not installed for ECMP. An ECMP limit of 4 is a maximum, not a requirement to install four paths.

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QuestionQ2

Introduction to Security

Which of these is a valid alternate representation of the IPv6 address 2001:0da8:0000:0000:0024:0000:4ab9:0300?

A 2001:0da8::0024:0000:4ab9:03
B 2001:da8::0:24::4ab9:300
C 2001:da8::24::4ab9:300
D 2001:da8::24:0:4ab9:300

Explanation

IPv6 notation permits omission of leading zeros within each hextet and replacement of one contiguous sequence of all-zero hextets with ::. The address therefore becomes 2001:da8::24:0:4ab9:300; only one :: may appear in an IPv6 address.

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QuestionQ3

Introduction to Security

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In the diagram, every router uses IS-IS as its routing protocol. The number beside each link represents that link's metric value.

Which path will traffic take from router R1 to router R7, and from router R7 to router R1?

A Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
B Router R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).
C Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).
D Router R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).

Explanation

Level 1 routers send traffic for destinations outside their area to the nearest attached L1/L2 router. R1 therefore selects R3 rather than R4, while R7 sends traffic to R6. In the Level 2 topology, R3 reaches R6 through R5 with a metric of 25, whereas R6 reaches area 49.0001 more cheaply through R4 (metric 10) than through R5 and R3 (metric 25). The resulting paths are R1-R3-R5-R6-R7 and R7-R6-R4-R2-R1.

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QuestionQ4

SR OS Control Plane Security

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In the diagram, all routers use IS-IS as the routing protocol. The number beside each link represents its metric value.

What path will traffic take from router R6 to router R3, and from router R3 to router R6?

A Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R2-R5-R6).
B Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R2-R5-R6).
C Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
D Router R6 to router R3 will follow (R6-R5-R7-R4-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).

Explanation

A Level 1 router forwards traffic destined outside its area to the nearest attached L1/L2 router. R6 therefore sends traffic through R5; R5 reaches R3 most efficiently through R2, for R6-R5-R2-R3. R3 selects R4 as its nearest L1/L2 router, and R4’s lowest-metric Level 2 path toward R5 is through R7, producing R3-R4-R7-R5-R6. Juniper IS-IS Overview

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QuestionQ5

Introduction to Security

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Static routing will be used for a network connecting a corporate head office and a branch office. The head office has many attached subnetworks, while the branch office has one subnetwork and one connection to the head office. Which configuration is most likely on the head-office and branch-office routers?

A The head office has a default route and the branch office has a specific static route.
B The head office and the branch offices both have specific static routes.
C The head office and the branch office both have default routes.
D The head office has a specific static route and the branch office has a default route.

Explanation

A branch router with one connection to the rest of the network is a stub router, so a default route can forward all traffic for nonlocal destinations toward the head office. The head-office router needs a specific static route to the branch subnet for return traffic. Cisco Networking Academy documentation likewise configures a default route on stub routers and specific routes on the upstream router for their internal networks.

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