Cisco Semester 3, CH1-2 Quiz Questions
During this OSPF state, no Hello packets are received.
Down State
What is a feature of the OSPF routing protocol? -It scales well in both small and large networks. -OSPF authentication is configured in the same way on IPv4 and IPv6 networks. -Routers can be grouped into autonomous systems to support a hierarchical system. -The SPF algorithm chooses the best path based on 30-second updates.
-It scales well in both small and large networks.
Which of the following applies to the router ID? (Choose two) -The router ID cannot be defined by an administrator. -The router ID is not used to determine the BDR. -The router ID is used to determine the DR. -The router ID uniquely identifies the router. -The router ID is not required.
-The router ID is used to determine the DR. -The router ID uniquely identifies the router.
Which three statements describe features of the OSPF topology table? (Choose three.) -After convergence, the table only contains the lowest cost route entries for all known networks. -The topology table contains feasible successor routes. -When converged, all routers in an area have identical topology tables. -It is a link-state database that represents the network topology. -The table can be viewed via the show ip ospf database command. -Its contents are the result of running the SPF algorithm.
-When converged, all routers in an area have identical topology tables. -It is a link-state database that represents the network topology. -The table can be viewed via the show ip ospf database command.
What are two reasons for creating an OSPF network with multiple areas? -to ensure that an area is used to connect the network to the Internet -to reduce SPF calculations -to simplify configuration -to provide areas in the network for routers that are not running OSPF -to reduce use of memory and processor resources
-to reduce SPF calculations -to reduce use of memory and processor resources
The OSPF hello timer has been set to 15 seconds on a router in a point-to-point network. By default, what is the dead interval on this router?
60s
Which of the following OSPF components is associated with the neighbor table?
Adjacency database
Which statement is correct about multiarea OSPF? -OSPF can consolidate a fragmented OSPF area into one large area. -OSPF multiarea increases the frequency of SPF calculation. -All routers are in one area called the backbone area (area 0). -Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers.
Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers.
Which of the following OSPF components is responsible for computing the cost of each route?
Dijkstra's algorithm
What function is performed by the OSPF designated router?
Dissemination of LSAs
What is the correct order in the steps for Link-State operation?
Establish Neighbor Adjacencies Exchange Link-State Advertisements Build the Topology Table Execute the SPF Algorithm Choose the Best Route
During this OSPF state on point-to-point networks, the routers decide which router initiates the exchange of DBD packets.
ExStart State
During this OSPF state, routers send each other DBD packets.
Exchange State
True or False? In the router ospf process-id command, the process ID value, which can any number between 1 and 65,535, is globally significant. It must be the same on all routers in the OSPF area.
False **It is locally significant**
Which of the following OSPF components is associated with the routing table?
Forwarding database
At which OSPF state are neighbor routers converged and able to exchange routing updates?
Full
During this OSPF state, routers have converged link-state databases.
Full State
What is the order of packet types used by an OSPF router to establish convergence?
Hello, DBD, LSR, LSU, LSAck
An OSPF router enters this state when it has received a Hello packet from a neighbor, containing the sending Router ID.
Init State
Which OPSF packet contains the different types of link-state advertisements?
LSU
What is identical on all OSPF routers within a single area?
Link-state database
Which of the following OSPF components is associated with the topology table?
Link-state database
During this OSPF state, routes are processed using the SPF algorithm.
Loading State
A router is participating in an OSPFv2 domain. What will always happen if the dead interval expires before the router receives a hello packet from an adjacent DROTHER OSPF router?
OSPF will remove that neighbor from the router link-state database
Which of the following is used with the Hello Packet to uniquely identify the originating router?
Router ID
Which of the following is the order of precedence for choosing the router ID?
Router ID that is explicitly configured Highest IPv4 loopback address Highest active configured IPv4 address
What does an OSPF area contain?
Routers that have the same link-state info in their LSDBs
What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency?
They exchange abbreviated lists of their LSDBs
During this OSPF state on multiaccess networks, the routers elect a Designated Router (DR) and a Backup Designated Router (BDR).
Two-Way State
Which of the following OSPF packets is responsible for establishing and maintaining adjacency with other OSPF routers?
Type 1: Hello packet
Which of the following OSPF packets contains an abbreviated list of the LSDB of the sending router?
Type 2: DBD packet
Which of the following OSPF packets is used by routers to request more information?
Type 3: LSR packet
Which of the following OSPF packets is used by routers to announce new information?
Type 4: LSU packet
Which of the following OSPF packets is used to confirm receipt of an LSA?
Type 5: LSAck packet
What is used to create the OSPF neighbor table?
adjacency database
What is a function of OSPF hello packets?
to discover neighbors and build adjacencies between them
