Cisco 4
Which criterion is preferred by the router to choose a router ID?
0.0.0.31
What is the correct order in the steps for Link-State operation?
1. Establish Neighbor Adjacencies 2. Exchange Link-State Advertisements 3. Build Link-State Database 4. Execute SPF Algorithm 5. Choose the Best Route
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?
60 Seconds.
What is used to create the OSPF neighbor table?
Adjacency Database.
Which of the following OSPF components is associated with the neighbor table?
Adjacency database
Which statement is correct about multiarea OSPF?
Arranging routers into areas partitions a large autonomous system in order to lighten the load on the 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.
During this OSPF state, no Hello packets are received.
Down
During this OSPF state on point-to-point networks, the routers decide which router initiates the exchange of DBD packets.
ExStart
During this OSPF state, routers send each other DBD packets.
Exchange
True or False? In the router ospf process-id command, the process ID value, which can any number between 1 and 65,535, is locally significant. It must be the same on all routers in the OSPF area.
False
Which of the following OSPF components is associated with the routing table?
Forwarding database
During this OSPF state, routers have converged link-state databases.
Full
During this OSPF state, routes are processed using the SPF algorithm.
Full
At which OSPF state are neighbor routers converged and able to exchange routing updates?
Full.
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
A network administrator has just changed the router ID on a router that is working in an OSPFv2 environment. What should the administrator do to reset the adjacencies and use the new router ID?
Issue the clear ip ospf process privileged mode command
What is a feature of the OSPF routing protocol?
It scales well in both small and large groups.
Which OSPF 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
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 three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? (Choose three.)
OSPFv2 network type hello timer subnet mask
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.
Which of the following applies to the router ID? (Choose two)
Router ID uniquely identifies the router. Router ID is used to determine the DR.
A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID?
The loopback interface of the ip
What does the SPF algorithm consider to be the best path to a network?
The path that includes the fastest cumulative bandwidth links.
Which criterion is preferred by the router to choose a router ID?
The router id RID command
What is one use of the router ID in OSPF routing?
The router-id can be used to break a tie in the election process.
What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency?
They exchange abbreviated versions of their LSDBs.
What are two reasons for creating an OSPF network with multiple areas? (Choose two.)
To reduce use of memory and processor resources. To reduce SPF calculations.
During this OSPF state on multiaccess networks, the routers elect a Designated Router (DR) and a Backup Designated Router (BDR).
Two-Way
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 are two features of the OSPF routing protocol? (Choose two.)
Uses Dijkstras algorithm calculates its metric using bandwith
Which three statements describe features of the OSPF topology table? (Choose three.)
When converged, all routers in an area have an identical topology table. It is a link-state database that represents the networks topology. The table can be viewed with the show ip ospf database command.
Which command, if applied on an OSPF router, would give a Gigabit Ethernet interface a lower cost than a Fast Ethernet interface?
auto-cost reference-bandwidth 1000
A router in an OSPF enterprise network has a default static route that has been configured via the interface that connects to the ISP. Which command would the network administrator apply on this router so that other routers in the OSPF network will use this default route?
default-information originate
What is the first criterion used by OPSF routers to elect a DR?
highest priority
The following three networks are directly connected to an OSPF router; 192.168.0.0/24, 192.168.1.0/24, and 192.168.2.0/24. Which OSPF network command would advertise only the 192.168.1.0 network to neighbors?
network 192.168.1.0 0.0.0.255 area 0
What does an OSPF area contain?
routers that have the same link-state information in their LSDBs.
Which command can be used to view the OSPF hello and dead time intervals?
show ip ospf interface
Which command could be used on a router to ensure that an OSPF adjacency is formed with another router?
show ip ospf neighbor
Which verification command would identify the specific interfaces on a router that were configured with the passive-interface command?
show ip protocols
What is a function of OSPF hello packets?
to discover neighbors and build adjacencies between them
