Nokia NRS II case studies
Nokia NRS II · Put your knowledge to work in context.
NRS II is the second tier of Nokia's routing and switching certification path, aimed at network engineers who design, deploy, and operate IP/MPLS networks built on Nokia service router platforms. Nokia describes its industry-recognized certification programs as a way to "build your technical expertise and enhance your professional standing," and the IP networks solution area is framed around building "scalable, secure, and adaptive networks." The exam is organized into four equally weighted domains: IP networks; IP routing, switching and aggregation; IP network automation; and IP network security. The Nokia NRS II case studies are 5 cases and about 2,277 words.
1IPv4 CGNAT port exhaustion at a regional broadband provider
A regional broadband provider serves 50,000 residential subscribers through a Nokia 7750 SR BNG running NAT44. The provider has only eight public IPv4 addresses left for CGNAT and currently uses dynamic NAT with a 1,024-port limit per subscriber.
529 words, about 3 min2Asymmetric BGP return path breaks a stateful firewall
A retail company runs OSPF area 0 across its headquarters and two data centers. Each data center has a pair of Nokia 7750 SR routers running iBGP with each other and eBGP to a different ISP.
512 words, about 3 min3Slow VPLS convergence after MC-LAG failover
A service provider aggregates 300 business customers through two Nokia 7750 SR routers, AGG-1 and AGG-2, configured as an MC-LAG pair. Access switches are dual-homed with LACP.
419 words, about 2 min4Model-driven automation across mixed SR OS releases
A network team manages 200 Nokia 7750 SR routers. 140 run SR OS 22.10 with MD-CLI enabled; 60 run 19.10 and use classic CLI.
433 words, about 2 min5Strict uRPF versus asymmetric ISP routing
A university has a 10 Gbps primary ISP link and a 1 Gbps backup ISP link. The border Nokia 7750 SR runs eBGP with both ISPs and receives about 1,200 prefixes.
384 words, about 2 min