30 Questions
What type of routing protocol is OSPF?
Link-state protocol
What is the purpose of a Link State Advertisement (LSA) in OSPF?
To describe the state of a router's links to its immediate neighbours
How do routers in an OSPF network build their routing tables?
By using an algorithm like Edsger Dijkstra's SPF
What is the advantage of OSPF over some other routing protocols?
It can use less bandwidth and converge more quickly
What happens when a link on a single OSPF router changes state?
A single link-state message is distributed throughout the network
What is the purpose of the Link State Database (LSDB) in OSPF?
To store all the link-state messages received by a router
What is the main disadvantage of link-state protocols?
They can be computationally intensive compared to distance-vector protocols.
What is the primary scaling overhead in link-state protocols?
Coping with the frequency of LSA updates as the size of a link-state area increases.
What is the role of area 0 in the OSPF network?
It acts as a central node and transmits link information of other areas.
What type of LSAs are supported by the standard area?
1, 2, 3, 4, and 5 LSAs.
How do distance-vector protocols compare to link-state protocols in terms of computation?
They require less computation.
What is the total number of OSPF areas mentioned in the text?
5
What is the purpose of LSA Type 1 packets?
To describe its own interfaces and carry information about its neighbors to adjacent routers
What is the role of the Designated Router (DR) in generating LSA packets?
Generating LSA Type 2 packets
What type of LSA packets are generated by the ASBR to advertise external redistributed routes into the OSPF's AS?
LSA Type 5
What is the total number of LSA types supported by OSPF?
11
Where do LSA Type 1 packets remain?
Within the same area of origin
Which type of LSA packets are used by ABRs to advertise the ASBR route through their areas?
LSA Type 4
What type of LSA packets are used by the ASBR to inform its neighbors within its networks?
LSA Type 1
What is the purpose of LSA Type 2 packets?
To describe all routers connected to a segment directly
What is assumed about the reader's knowledge in this article?
The reader has a good understanding of basic OSPF theory and is comfortable with OSPF concepts
What is the purpose of LSA Type 6 packets?
To support multicast routing through OSPF
What type of entry would an external route/prefix be seen as in other OSPF routers routing tables?
O E1 or E2
What is the status of Multicast OSPF (MOSPF) in terms of support by Cisco?
It is not supported by Cisco and is expected to be retired soon
What is the purpose of LSA Type 7 packets?
To mask LSA Type 5 packets and allow them to move through special areas
What is the main function of the ABR in relation to LSA Type 7 packets?
To translate LSA Type 7 packets back to LSA Type 5 packets
What is the purpose of LSA Type 8 packets in OSPFv2?
To transit BGP attributes through an OSPF network
What is the practical application of Opaque LSAs (LSA Type 9, 10 & 11)?
To extend the capabilities of OSPF in MPLS traffic engineering
What is the function of LSA Type 5 packets?
To convey BGP destinations through an OSPF network
What is the main difference between LSA Type 8 packets in OSPFv2 and OSPFv3?
OSPFv2 uses LSA Type 8 for external attributes, while OSPFv3 uses it for link local attributes
Test your knowledge of OSPF, a link-state routing protocol used in enterprise networking. Learn about its features and how it differs from distance-vector protocols. Assess your understanding of OSPF's link-state information and its application in routing.
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