300-440 Question 110
Select 3An enterprise network is running OSPF as its routing protocol. One of the routers in the network is connected to an external network via static routing and redistributes these routes into the OSPF domain. Another router serves as a connection point between two different OSPF areas. A third router is located entirely within a single OSPF area. How would these routers be classified respectively within OSPF?
- A
The router redistributing static routes into OSPF is an ASBR.
- B
The router connecting two OSPF areas is an ABR.
- C
The router entirely within a single OSPF area is an Internal Router.
- D
The router redistributing static routes into OSPF is a Backbone Router.
- E
The router connecting two OSPF areas is an Internal Router.
Show answer and explanation
Correct answers: A, B, C
Explanation
In OSPF, routers are classified based on their role within the OSPF domain. An ASBR redistributes external routes into OSPF, an ABR connects two or more OSPF areas, and an Internal Router operates entirely within a single OSPF area. Understanding these classifications is critical for designing and troubleshooting OSPF networks.
- A. Correct.
Correct. A router redistributing routes from another routing domain into OSPF is classified as an Autonomous System Boundary Router (ASBR).
- B. Correct.
Correct. A router that connects two or more OSPF areas, including the backbone area (Area 0), is classified as an Area Border Router (ABR).
- C. Correct.
Correct. A router located entirely within a single OSPF area is classified as an Internal Router.
- D. Incorrect.
Incorrect. A Backbone Router is a router that participates in OSPF Area 0 (the backbone area). Redistributing routes does not classify a router as a Backbone Router.
- E. Incorrect.
Incorrect. A router that connects two OSPF areas is not an Internal Router but is instead classified as an Area Border Router (ABR).