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Worksheets105P2 Module 1&2 Review
Total questions: 24
Worksheet time: 13mins
(MODULE 1)
What is a function of OSPF hello packets?
to ensure database synchronization between routers
to request specific link-state records from neighbor routers
to send specifically requested link-state records
to discover neighbors and build adjacencies between them
Which OPSF packet contains the different types of link-state advertisements?
LSU
LSAck
DBD
hello
Which three statements describe features of the OSPF topology table? (Choose three.)
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.
When converged, all routers in an area have identical topology tables.
It is a link-state database that represents the network topology.
The topology table contains feasible successor routes.
What does an OSPF area contain?
routers whose SPF trees are identical
routers that have the same link-state information in their LSDBs
routers that share the same process ID
routers that share the same router ID
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?
SPF will run and determine which neighbor router is "down".
OSPF will remove that neighbor from the router link-state database.
A new dead interval timer of 4 times the hello interval will start.
OSPF will run a new DR/BDR election.
What is the order of packet types used by an OSPF router to establish convergence?
- LSR (Link-State request)
- DBD (Database Description)
- LSAck (Link-State Acknowledgement)
- LSU (Link-State Update)
Hello, DBD, LSR, LSU, LSAck
LSAck, Hello, DBD, LSU, LSR
LSU, LSAck, Hello, DBD, LSR
Hello, LSAck, LSU, LSR, DBD
What is a feature of the OSPF routing protocol?
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.
OSPF authentication is configured in the same way on IPv4 and IPv6 networks.
What is used to create the OSPF neighbor table?
adjacency database
routing table
forwarding database
link-state database
What is identical on all OSPF routers within a single area?
Router ID
link-state database
static routes
neighbor table
What function is performed by the OSPF designated router (DR)?
maintaining the link-state database
summarizing routes between areas
redistribution of external routes into OSPF
dissemination of LSAs
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
to provide areas in the network for routers that are not running OSPF
to simplify configuration
to ensure that an area is used to connect the network to the Internet
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?
30 seconds
45 seconds
60 seconds
15 seconds
(MODULE 2)
Which criteria is preferred by the router to choose a router ID?
the IP address of the highest active OSPF-enabled interface
the IP address of the highest configured loopback interface on the router
the router-id rid command (An explicitly declared rid)
the IP address of the highest active interface on the router
Which wildcard mask would be used to advertise the 192.168.5.96/27 network as part of an OSPF configuration?
255.255.255.224
255.255.255.223
0.0.0.32
0.0.0.31
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?
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 0.0.0.0 area 0
router(config-router)# network 192.168.1.0 255.255.255.255 area 0
Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? (Choose three.)
hello timer
subnet mask
OSPFv2 type of network
router ID
interface priority
What are two features of the OSPF routing protocol? (Choose two.)
used primarily as an EGP
calculates its metric using bandwidth
uses Dijkstra's algorithm to build the SPF tree
has an administrative distance of 100
automatically summarizes networks at the classful boundaries
Which command, if applied on an OSPF router, would give a Gigabit Ethernet interface a lower cost than a Fast Ethernet interface?
(config-if)# ip ospf cost 100
(config-if)# bandwidth 100
(config-router)# auto-cost reference-bandwidth 1000
(config-if)# ip ospf priority 1
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 OSPFv2 process ID.
Issue the clear ip ospf process privileged mode command.
Change the interface priority.
Which command can be used to view the OSPF hello and dead time intervals?
show ip protocols
show ip ospf neighbor
show ip ospf interface
show ip ospf route
What does the SPF algorithm consider to be the best path to a network?
The path that includes the fastest single bandwidth link.
The path that includes the fastest cumulative bandwidth links.
The path with the least number of hops.
The path with the smallest delays.
What is one use of the router ID in OSPF routing?
The router ID identifies the OSPF area.
The router ID indicates the highest IPv4 address of all routers that are participating in OSPF routing.
The router ID indicates the router priority value.
The router ID can be used to break a tie in the election process.
What is the first criteria used by OPSF routers to elect a DR?
highest priority
highest MAC address
highest IP address
highest router ID
Which command could be used on a router to ensure that an OSPF adjacency is formed with another router?
show ip ospf interface
show ip route
show ip ospf neighbor
show ip protocols
