JNCIS ENT OSPF Routing Configuration

1. Which OSPF neighbor state indicates that bidirectional communication has been established?

Init

Exstart

Two-Way

Exchange

2. What is the primary advantage of using OSPF areas in large networks?

Reduces hello interval overhead

Decreases memory and CPU by limiting LSA flooding scope

Eliminates the need for a backbone area

Increases routing protocol convergence speed

Submit

4. Which OSPF area type prevents the import of external (Type 5) LSAs?

Standard area

Transit area

Stub area

Backbone area

Submit

6. In Junos, what is the default priority value used in OSPF DR/BDR election?

0

1

50

128

7. Which OSPF parameter must match on both sides of an adjacency for neighbors to form?

Router ID

Interface cost

Network mask

Priority value

Submit

9. In OSPF, Type 3 LSAs are generated by which router type?

Backbone routers

Area Border Routers (ABR)

Autonomous System Border Routers (ASBR)

Internal routers

10. What is the maximum number of equal-cost paths OSPF can load-balance across by default in Junos?

2

4

8

16

11. In OSPF, what is the default administrative distance (AD) value for routes learned from internal routers?

90

100

110

120

Submit

13. What is the OSPF cost formula when using default reference bandwidth?

Cost = Bandwidth / Reference Bandwidth

Cost = Reference Bandwidth / Bandwidth

Cost = Bandwidth × Reference Bandwidth

Cost = Reference Bandwidth - Bandwidth

14. Which command in Junos configures the OSPF area type as totally stubby?

Set protocols ospf area stub

Set protocols ospf area totally-stub

Set protocols ospf area no-summary

Set protocols ospf area restrict-summary

15. In OSPF configuration, what does the dead interval represent?

Time before a neighbor is declared down

Time between hello packets

Time to recalculate SPF

Time to flush old LSAs

16. What is the primary function of a Designated Router (DR) in OSPF?

Generate all LSAs for the network

Act as a central point for adjacency on multiaccess networks

Maintain the OSPF routing table

Calculate shortest path first tree

17. Which LSA type is flooded throughout an entire OSPF autonomous system?

Type 1

Type 2

Type 4

Type 5

18. In Juniper Junos, the OSPF reference bandwidth is used to calculate interface costs. What is the default reference bandwidth?

10 Mbps

100 Mbps

1 Gbps

10 Gbps

19. What is the default OSPF hello interval (in seconds) for broadcast networks?

5

10

15

30

20. Which OSPF area type does not accept summary LSAs from the backbone area?

Stub

Totally stubby

NSSA

Transit

JNCIS ENT OSPF Routing Configuration Quiz

1. Which OSPF neighbor state indicates that bidirectional communication has been established?

2.

What first name or nickname would you like us to use?

2. What is the primary advantage of using OSPF areas in large networks?

3. In OSPF configuration, the ____ is a unique 32-bit identifier that must be manually configured or derived from interface addresses.

4. Which OSPF area type prevents the import of external (Type 5) LSAs?

5. OSPF uses the ____ algorithm to calculate the shortest path tree to all known destinations.

6. In Junos, what is the default priority value used in OSPF DR/BDR election?

7. Which OSPF parameter must match on both sides of an adjacency for neighbors to form?

8. The OSPF ____ defines the collection of routers and links that share the same link-state information.

9. In OSPF, Type 3 LSAs are generated by which router type?

10. What is the maximum number of equal-cost paths OSPF can load-balance across by default in Junos?

11. In OSPF, what is the default administrative distance (AD) value for routes learned from internal routers?

12. In OSPF, a router becomes a ____ when it is elected to manage LSA flooding on a multiaccess segment.

13. What is the OSPF cost formula when using default reference bandwidth?

14. Which command in Junos configures the OSPF area type as totally stubby?

15. In OSPF configuration, what does the dead interval represent?

16. What is the primary function of a Designated Router (DR) in OSPF?

17. Which LSA type is flooded throughout an entire OSPF autonomous system?

18. In Juniper Junos, the OSPF reference bandwidth is used to calculate interface costs. What is the default reference bandwidth?

19. What is the default OSPF hello interval (in seconds) for broadcast networks?

20. Which OSPF area type does not accept summary LSAs from the backbone area?