Nokia NRS I Certification – Actual Exam
Questions & Answers with Rationales
Network Routing Specialist I | 2026/2027
Version 100% Correct | Pass Guaranteed
Q01 What is the default administrative distance of a static route on Nokia SR OS?
Answer: 5
Rationale: On Nokia SR OS (formerly Alcatel-Lucent TiMOS), the default administrative
distance for static routes is 5, which is lower than OSPF (10), IS-IS (15), and BGP (170/200),
making static routes preferred over learned routes by default.
Q02 Which command is used to display the current routing table on Nokia SR OS?
Answer: show router route-table
Rationale: The command show router route-table displays the active IPv4 routing table. Use
show router 6 route-table for IPv6.
Q03 A static route is configured with the command: static-route 10.10.10.0/24 next-hop
192.168.1.1 What is the default preference (administrative distance) of this route?
Answer: 5
Rationale: When no preference is explicitly specified, Nokia SR OS assigns the default static
route preference of 5.
Q04 Which command configures a static route with an administrative distance of 10?
Answer: static-route 10.10.10.0/24 next-hop 192.168.1.1 preference 10
, Rationale: The preference keyword is used to manually set the administrative distance (lower
value = higher priority).
Q05 What is the purpose of a floating static route?
Answer: To provide backup routing when a dynamic route is lost
Rationale: A floating static route has a higher administrative distance (lower priority) than the
primary dynamic route. It becomes active only when the better route is withdrawn.
Q06 Which command shows all static routes configured on the router, including inactive ones?
Answer: show router static-route
Rationale: This command displays the full static route database, including routes that are not
currently active due to better routes or unresolved next-hops.
Q07 A static route is configured with blackhole next-hop. What happens to packets matching
this route?
Answer: Packets are silently discarded
Rationale: Blackhole routing drops packets without sending ICMP unreachable messages (used
for DDoS mitigation or route summarization).
Q08 Which command configures a blackhole static route for prefix 172.16.0.0/16?
Answer: static-route 172.16.0.0/16 black-hole
Rationale: The black-hole keyword specifies the next-hop type as a null interface, silently
dropping matching traffic.
Q09 A static route next-hop is not resolvable. What is the status of the route in the route table?
Answer: The route is inactive / not installed
Questions & Answers with Rationales
Network Routing Specialist I | 2026/2027
Version 100% Correct | Pass Guaranteed
Q01 What is the default administrative distance of a static route on Nokia SR OS?
Answer: 5
Rationale: On Nokia SR OS (formerly Alcatel-Lucent TiMOS), the default administrative
distance for static routes is 5, which is lower than OSPF (10), IS-IS (15), and BGP (170/200),
making static routes preferred over learned routes by default.
Q02 Which command is used to display the current routing table on Nokia SR OS?
Answer: show router route-table
Rationale: The command show router route-table displays the active IPv4 routing table. Use
show router 6 route-table for IPv6.
Q03 A static route is configured with the command: static-route 10.10.10.0/24 next-hop
192.168.1.1 What is the default preference (administrative distance) of this route?
Answer: 5
Rationale: When no preference is explicitly specified, Nokia SR OS assigns the default static
route preference of 5.
Q04 Which command configures a static route with an administrative distance of 10?
Answer: static-route 10.10.10.0/24 next-hop 192.168.1.1 preference 10
, Rationale: The preference keyword is used to manually set the administrative distance (lower
value = higher priority).
Q05 What is the purpose of a floating static route?
Answer: To provide backup routing when a dynamic route is lost
Rationale: A floating static route has a higher administrative distance (lower priority) than the
primary dynamic route. It becomes active only when the better route is withdrawn.
Q06 Which command shows all static routes configured on the router, including inactive ones?
Answer: show router static-route
Rationale: This command displays the full static route database, including routes that are not
currently active due to better routes or unresolved next-hops.
Q07 A static route is configured with blackhole next-hop. What happens to packets matching
this route?
Answer: Packets are silently discarded
Rationale: Blackhole routing drops packets without sending ICMP unreachable messages (used
for DDoS mitigation or route summarization).
Q08 Which command configures a blackhole static route for prefix 172.16.0.0/16?
Answer: static-route 172.16.0.0/16 black-hole
Rationale: The black-hole keyword specifies the next-hop type as a null interface, silently
dropping matching traffic.
Q09 A static route next-hop is not resolvable. What is the status of the route in the route table?
Answer: The route is inactive / not installed
