Nokia 4A0-113 OSPF case studies
Nokia 4A0-113 OSPF · Put your knowledge to work in context.
The Nokia 4A0-113 exam tests OSPF knowledge in a Nokia service router context, and it is most useful to network engineers, design staff, and operations staff who deploy or support IP/MPLS networks built on Nokia SR OS. It is a focused routing exam rather than a general networking survey: expect questions on how OSPF forms adjacencies, how the link-state database is built from the different LSA types, how SPF chooses paths, how areas and summarization keep large topologies manageable, and how authentication and troubleshooting are handled. The Nokia 4A0-113 OSPF case studies are 5 cases and about 3,665 words.
1ExStart Stall and Silent Hellos on a Shared Metro VLAN
Three Nokia SR OS routers share VLAN 100 on a metro Ethernet switch: R1 (10.10.0.1/29), R2 (10.10.0.2/29) and R3 (10.10.0.3/29). All three sit in area 0.0.0.1 with hello 10, dead 40 and no authentication.
724 words, about 4 min2Sixty Branch Areas, One Firewall, and a Memory Budget
A campus hub router R-HQ is the area 0 ABR for 60 branch areas, area 1 through area 60. Each branch has one SR OS access router with three /24 user LANs and a /30 link to R-HQ.
763 words, about 4 min3Virtual Link Behind a Stub Area
R-A is a backbone router in area 0. R-B is an ABR between area 0 and area 5.
749 words, about 4 min4Two Equal-Cost Paths, One Forwarding Next Hop
R1 sits in area 0 with two parallel paths to 10.20.0.0/16: via R2 at a cost of 20 and via R3 at a cost of 20. show router ospf routes 10.20.0.0/16 lists both next hops, but show router route-table 10.20.0.0/16 shows only the R2 next hop.
690 words, about 3 min5Externals Missing, Overload Left On, and a Stub in the Way
R-EDGE is a Nokia SR OS ASBR in area 0. It must inject 300 static routes and two connected /24s into OSPF; the statics point to a partner network reachable through a firewall on a separate VLAN.
739 words, about 4 min