OSPf

What is used to facilitate hierarchical routing in OSPF?

the use of multiple areas

What benefit does hierarchical routing in OSPF add

reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain.

Which OSPF data structure is identical on all OSPF routers that share the same area

link-state database

Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router

exchanges link-state advertisements

Hello Packet

to see if the router is up or down

Database Description Packet

OSPF DD packets are used to synchronize LSDB between routers in an adjacency relationship. DD packets provide an overview of the LSDB. The DD packet includes a list of LSA headers as an overview of the LSDB.

Link-State Request Packet

When a router detects that portions of its topological database are out of date, it sends a link-state request packet to a neighbor requesting a precise instance of the database.

Link-State Update Packet

Each Link State Update packet carries a collection of link state advertisements one hop further from its origin

Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to check against the local LSDB?

database description

What indicates to a link-state router that a neighbor is unreachable?

if the router no longer receives hello packets

Which three OSPF states are involved when two routers are forming an adjacency

Down
Init
Two-Way

In an OSPF network when are DR and BDR elections required

when the routers are interconnected over a common Ethernet network

Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination?

executing the SPF algorithm

Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces?

establishing neighbor adjacencies (Full State

Which step in the link-state routing process is described by a router flooding link-state and cost information about each directly connected link?

exchanging link-state advertisements

True/False - In a single ospf area all routers will have the same link state information in their LSDB.

True

What are the two multicast address used with OSPF?

224.0.0.5
224.0.0.6