M1-2 (Single-Area OSPFv2 and Configurations) Flashcards
reviewer
What OSPF component is associated with the neighbor table?
Adjacency Database
What OSPF component is responsible for computing the cost of each route?
Dijkstra Algorithm
What OSPF components is associated with the topology table?
Link-State Database
What OSPF components is associated with the routing table?
Forwarding Database
What is the correct order in the steps for Link-State operation? Piece it together
Establishing Neighbor Adjacencies
Choose the Best Route
Execute the SPF Algorithm
Build the Topology Table
Exchange Link-State Advertisements
Establishing Neighbor Adjencies -> Exchange Link-State Advertisements -> Building the Topology Table -> Execute the SPF Algorithm -> Choose the Best Route
What OSPF packet is responsible for establishing and maintaining adjaceny with other OSPF routers?
Type 1: Hello Packet
Type 2: DBD Packet
Type 3: LSR Packet
Type 4: LSU Packet
Type 5: LSAck Packet
Type 1: Hello Packet
What OSPF packet contains an abbreviated list of the LSDB of the sending router?
Type 1: Hello Packet
Type 2: DBD Packet
Type 3: LSR Packet
Type 4: LSU Packet
Type 5: LSAck Packet
Type 2: DBD Packet (Database Description)
OSPF packet is used by routers to announce new information?
Type 1: Hello Packet
Type 2: DBD Packet
Type 3: LSR Packet
Type 4: LSU Packet
Type 5: LSAck Packet
Type 4: LSU Packet (Link-State Update)
What OSPF packet is used by routers to request more information?
Type 1: Hello Packet
Type 2: DBD Packet
Type 3: LSR Packet
Type 4: LSU Packet
Type 5: LSAck Packet
Type 3: LSR Packet (Link-State Request)
It is used to confirm receipt of an LSA?
Type 1: Hello Packet
Type 2: DBD Packet
Type 3: LSR Packet
Type 4: LSU Packet
Type 5: LSAck Packet
Type 5: LSAck Packet (Link-State Acknowledgement)
During this OSPF state on multiaccess networks, the routers elect a Designated Router (DR) and a Backup Designated Router (BDR).
Two-Way State
This OSPF state, routers send each other DBD packets.
Exchange State
An OSPF router enters this state when it has received a Hello packet from a neighbor, containing the sending Router ID.
Init State
During this OSPF state on point-to-point networks, the routers decide which router initiates the exchange of DBD packets.
ExStart State
In this OSPF state, routers have convered link-state database.
Full State
During this OSPF state, no Hello packets are received.
Down State
This OSPF state, routers are processed using the SPF algorithm
Full State
What function of OSPF hello packets?
To send specifically requested link-state records
To discover neighobrs and build adjacencies between them
To ensure database synchronization between routers
To request specific link-state records from neighbor routers
To discover neighbors and build adjancies between them
This OSPF packet contains the different types of link-state advertisements?
LSU Packet (Link-State Update)
What describe features of the OSPF topology table? (Choose three answers.)
It is a link-state database that reprensets the network topology.
Its concecnts are the result of running the SPF algorithm.
When converged, all routers in an area have identical topology tables.
The topology tables contains feasible succecssor routes.
The table can be viewed via the show ip ospf database command.
After convergence, the table only contains the lowest cost route entries for all known networks.
It is a link-state database that reprents the network topology.
When converged, all routers in an area have identical topology tables.
The table can be viewed via the show ip ospf database command.
What does an OSPF area contain?
routers that share the same process ID
routers that share the same router ID
routers that have the same link-state information in their LSDBs
routers whose SPF trees are identical
Routers that have the same link-state information in their LSDBs
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?
A new Dead interval timer of four times the Hello interval will start
OSPF will remove that neighbor from the router’s link-state database
OSPF will run a new DR/BDR election
SPF will run and determine which neighbor router is down.
OSPF will remove that neighbor from the router link-state database.
What is the correct order of packet types used by an OSPF router to establish convergence? Piece it together.
Hello
LSAck
DBD
LSR
LSU
Hello, DBD, LSR, LSU, LSAck
What is the feature of the OSPF routing protocol?
OSPF authentication is configured in the sme way on IPv4 and IPv6 networks.
Routers can be grouped into autonomous systems to support a hierarchical system.
It scales well in both small and large networks.
The SPF algorithm chooses the best path based on 30-second updates.
It scales well in both small and large networks.
What is used to create the OSPF neighbor table?
Adjacency Database
What is identical on all OSPF routers within a single area?
Neighbor Table
Routing Table
Link-State Database
Static Routes
Link-State Database
What function is performed by the OSPF designated router?
Redistribution of external routes into OSPF
Dissemination of LSAs
Maintaining the link-state database
Summarizing routes between areas
Dissemination of LSAs
What are two reasons for creating an OSPF network with multiple areas?
To provide areas in the network for routers that are not running OSPF
To ensure that an area is used to connect the network to the Internet
To reduce SPF calculations
To reduce use of memory and processor resources
To simplify configuration
To reduce SPF calculations and To reduce use of memory and processor resources
At which OSPF state are neighbor routers converged and able to exchange routing updates?
Full State
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 happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency?
They exchange DBD packets in order to advertise parameters such as hello and dead intervals.
They negotiate the election process if they are on a multiaccess network.
They request more information about their databases.
They exchange abbreviated lists of their LSDBs.
They exchange abbreviated lists of their LSDBs.
What is correct about multiarea OSPF?
OSPF can consolidate a fragmented OSPF area into one large area.
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.
OSPF multiarea increases the frequency of SPF calculation.
Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers.
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
What applies to the router ID? (Choose two answers.)
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 and The router ID uniquely identifies the router.
What criterion is preffered by the router to choose a router ID?
The router-id rid command
What wildcard mask would be used to advertise the 192.168.5.96/27 network as part of an OSPF configuration?
0.0.0.31
These 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. What OSPF network command would advertise only the 192.168.1.0 network to neighbors?
router(config-router)# network 192.168.1.0 0.0.0.0 area 0
router(config-router)# network 192.168.1.0 0.0.0.255 area 0
router(config-router)# network 192.168.1.0 0.0.0.255 area 0
router(config-router)# network 192.168.0.0 0.0.15.255 area 0
Router(config-router)# network 192.168.1.0 0.0.0.255 area 0
Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? (Choose three.)
Router ID
OSPFv2 process number
OSPFv2 type of network
Hello timer
Interface priority
Subnet mask
OSPFv2 type of network, Hello Timer, Subnet Mask
What are two features of the OSPF routing protocol (Choose two answers.)
Automatically summarizes networks at the classful boundaries
Has an administrative distance of 100
Calculates its metric using bandwidth
Uses Dijkstra’s algorithm to build the SPF tree
Used primarily as an EGP
Calculates its metric using bandwidth and Uses Dijkstra’s algorithm to build the SPF tree
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 IP address
The highest IP address on the LAN interfaces
The OSPF area ID that is configured on the interface with the highest IP address
The IP address of the interface that is configured with priority 0
The highest IP address that is configured on the WAN interfaces.
The loopback interface IP address.
What veritification command would identify the specific interfaces on a router that were configured witht he passive-interface command?
show ip eigrp neighbors
show ip protocols
show ip interface brief
show ip route eigrp
show ip protocols
What command is applied on an OSPF router, would give a Gigabit Ethernet interface a lower cost than a Fast Ethernet interface?
(config-router)# auto-cost reference-bandwidth 1000
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?
Configure the network statements.
Change the interface priority.
Issue the clear ip ospf process privileged mode command.
Change the OSPFv2 process ID
Change the OSPFv2 process ID.
What command can be used to view the OSPF hello and dead time intervals?
show ip ospf interface
What does the SPF algorithm consider to be the best path to a network?
The path with the least number of hops.
The path with the smallest delays.
The path that includes the fastest cumulative bandwidth links.
The path that includes the fastest single bandwidth link.
The path that includes the fastest cumulative bandwidth links.
What is one use of the router ID in OSPF routing?
The router ID indicates the router priority value.
The router ID identifies the OSPF area.
The router ID can be used to break a tie in the election process.
The router ID indicates the highest IPv4 address of all routers that are participating in OSPF routing.
The router ID can be used to break a tie in the election process.
What is the first criterion used by OSPF routers to elect a DR?
Highest priority
Highest IP address
Highest router ID
Highest MAC address
Highest priority
What command could be used on a router to ensure that an OSPF adjacency is formed with another router?
show ip ospf database
show ip ospf interface
show ip ospf neighbor
show ip route ospf
show ip ospf neighbor
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?
redistribute static
redistribute connected
redistribute static subnets
default-information originate
default-information originate
What is used with the Hello Packet to uniquely identify the originating router?
Hello Interval
Router ID
Designated Router ID
Network Mask
Dead Interval
Router ID
