NETW204: Assignment 4, Link-state Routing and OSPF (50 points)

Fill in the blanks below with either the term defined or the definition for the terms listed. Each answer is worth 2 points each, 25 questions X 2 = 50 total points. Type answers in the appropriate cell; text will automatically wrap. Post your completed assignment to the dropbox.


OSPF area
Attaches to multiple areas, maintains separate
link-state databases for each area it is connected
to, and routes traffic destined for or arriving from
other areas
Autonomous System Boundary Router (ASBR)
The OSPF router located between an OSPF autonomous system network and a non-OSPF net-work. ASBRs run both OSPF and another routing protocol, such as RIP. ASBRs must reside in a non-stub OSPF area
Backup Designated Router (BDR)
A router that becomes the designated router if the current designated router should fail. The BDR is the OSPF router with the second-highest at the time of the last DR election.
Database Description (DBD)
Contains an abbreviated list of the sending
router’s link-state database and is used by receiving routers to check against the local link-state database
Designated Router (DR)
OSPF router that generates LSAs for a multiaccess network and has other special responsibilities in running OSPF. Each multiaccess OSPF network that has at least two attached routers has a DR that is elected by the OSPF Hello protocol. The DR enables a reduction in the number of adjacencies required on a multiaccess network, which in turn reduces the amount of routing protocol traffic and the size of the topological database.
Routers that are not a DR or BDR. They are other routers in an OSPF network.
Flapping link
Routing problem where an advertised route between two nodes alternates (flaps) back and forth between two paths because of a network problem that causes intermittent interface failures.
The Highest active IP address...

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