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Link --- A physical and electrical connection between two
network devices.
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Link-state --- The status of a link between two routers. This
status includes information about a router's interface and its
relationship to neighboring routers.
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Cost --- The value assigned to a link. Rather than hops,
link-state protocols assign a cost to a link, which is based on the
speed of the network connection. |
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Area --- A collection of networks and routers that has the
same area identification. Each router within an area has the same
link-state information. A router within an area is called an internal
router. |
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Designated Router (DR)) --- One router on an OSPF multiaccess
network that is elected to represent all the routers in that
network. Each OSPF network has a DR and BDR. These routers have
special responsibilities that are discussed later in this chapter.
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Backup Designated Router (BDR) --- A standby router that
becomes the DR, if the original DR fails.
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Adjacencies database --- A listing of all the neighbors to
which a router has established bi-directional communication.
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Link-state database (or topological database) --- A
list of information about all other routers in the network. It shows
the network topology. All routers within an area have identical
link-state databases.
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Routing table --- The routing table (also known as the forwarding
database) is generated when an algorithm is run on the
link-state database. Each router's routing table is unique and
contains information of how and where to send packets to other
routers.
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