OSPF Link-State Advertisements

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Questions and Answers

What primary information does an OSPF link-state advertisement (LSA) contain?

Neighbor's MAC address and subnet mask.
Router's IP address and interface MTU.
Routing table and ARP cache.
Link state and link metric. (correct)

Where are received OSPF link-state advertisements (LSAs) stored?

Link-state database. (correct)
ARP cache.
Running configuration.
Routing table.

What is the purpose of the link metric included in an OSPF LSA?

To represent the cost to reach a destination via that link. (correct)
To specify the maximum packet size supported on the link.
To determine the administrative distance of the route.
To indicate the link's bandwidth capacity.

In OSPF, what does the 'link state' information in an LSA primarily describe?

The interface's condition and status. (D) Signup and view all the answers

How do OSPF routers use the information stored in the link-state database?

To construct the Shortest Path First (SPF) tree. (D) Signup and view all the answers

Which of the following is NOT a typical component of an OSPF LSA?

Router hostname. (C) Signup and view all the answers

Why is it important for OSPF routers to maintain an accurate link-state database?

To ensure optimal path selection and prevent routing loops. (B) Signup and view all the answers

If an OSPF router detects a change in the network topology, what action does it take?

Generates and floods a new LSA to its neighbors. (D) Signup and view all the answers

What happens if an OSPF router receives an LSA with outdated sequence number?

The router discards the LSA and may request an updated version. (D) Signup and view all the answers

Which of the following best describes OSPF's use of LSAs in maintaining network topology information?

LSAs advertise the state of a router's links to all routers in the OSPF area. (B) Signup and view all the answers

What is the relationship between the link-state database and the routing table in OSPF?

The link-state database is used to calculate the best routes, which are then placed in the routing table. (A) Signup and view all the answers

How does OSPF ensure that LSAs are reliably distributed throughout an area?

Through periodic retransmission and acknowledgment mechanisms. (D) Signup and view all the answers

Which factor has the most influence on the frequency of LSA updates in a stable OSPF network?

Changes in network topology or link states. (C) Signup and view all the answers

What happens when an OSPF router receives multiple LSAs advertising the same destination with different metrics?

It installs only the route with the lowest metric in the routing table. (C) Signup and view all the answers

An OSPF router is configured with multiple interfaces. How does the router decide which link-state information to include in its LSAs?

It includes information only about interfaces participating in the OSPF process. (B) Signup and view all the answers

Suppose an OSPF router is configured with an incorrect area ID. What is the likely outcome?

The router will not be able to form neighbor relationships with other routers in the network. (C) Signup and view all the answers

How does OSPF handle situations where different routers advertise conflicting information about the same network?

OSPF uses sequence numbers in LSAs to determine the most recent and accurate information. (A) Signup and view all the answers

What is the main benefit of using OSPF's link-state database compared to distance vector protocols like RIP?

OSPF converges faster and avoids routing loops. (C) Signup and view all the answers

What role does the designated router (DR) and backup designated router (BDR) play in the OSPF network regarding LSAs?

The DR and BDR flood LSAs on behalf of non-DR routers, reducing network traffic. (A) Signup and view all the answers

How does the OSPF area structure affect the scope of LSA flooding?

LSAs are only flooded within their respective areas, providing a hierarchical structure. (A) Signup and view all the answers

Flashcards

Link-State Advertisements (LSAs)

OSPF sends these to neighboring routers, containing link state and metric information.

Link-State Database

A local storage location where received LSAs are stored.

Study Notes

OSPF transmits link-state advertisements (LSAs) to adjacent routers.
LSAs include link state and link metric information.
Received LSAs are stored in a local database known as the link-state database.

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