Question 211 of 367 from exam 200-301-CCNA: Implementing and Administering Cisco Solutions

Question 211 of 367 from exam 200-301-CCNA: Implementing and Administering Cisco Solutions


Which statements describe the routing protocol OSPF? (Choose three.)



A. B. C. D. E. F.


The OSPF protocol is based on link-state technology, which is a departure from the Bellman-Ford vector based algorithms used in traditional Internet routing protocols such as RIP.

OSPF has introduced new concepts such as authentication of routing updates, Variable Length Subnet Masks (VLSM), route summarization, and so forth.

OSPF uses flooding to exchange link-state updates between routers.

Any change in routing information is flooded to all routers in the network.

Areas are introduced to put a boundary on the explosion of link-state updates.

Flooding and calculation of the Dijkstra algorithm on a router is limited to changes within an area.

OSPF (Open Shortest Path First) is a link-state routing protocol that operates within a single autonomous system (AS) to determine the shortest path between two routers. Here are the statements that describe OSPF:

A. It supports VLSM:

OSPF supports variable-length subnet masking (VLSM), which allows you to divide an IP network into subnets of different sizes. This can help conserve IP addresses and improve network efficiency.

C. It confines network instability to one area of the network:

OSPF divides a network into areas, which can reduce the impact of network instability. If a problem occurs within an area, only the routers within that area will be affected. Other areas will continue to function normally.

E. It allows extensive control of routing updates:

OSPF provides a range of options for controlling routing updates, including authentication, filtering, summarization, and redistribution. This allows network administrators to customize OSPF to meet their specific needs.

B. It is used to route between autonomous systems:

OSPF is an intra-domain routing protocol and is not used to route between autonomous systems (AS). External routing protocols such as Border Gateway Protocol (BGP) are used for routing between AS.

D. It increases routing overhead on the network:

OSPF does generate a lot of routing traffic because it floods link-state advertisements (LSAs) to all routers in the same area. However, this traffic can be reduced by summarizing the LSAs and using route redistribution.

F. It is simpler to configure than RIP v2:

OSPF can be more complex to configure than RIP v2 because it requires careful planning and design, and its features and options can be overwhelming for novice administrators. RIP v2, on the other hand, is relatively simple and can be easily configured.