WAN Module 1: Ch 1-2
Which command, if 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
Which wildcard mask would be used to advertise the 192.168.5.96/27 network as part of an OSPF configuration?
0.0.0.31
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
Which three statements describe features of the OSPF topology table? (Choose three.) A. When converged, all routers in an area have identical topology tables B. The table can be viewed via the show IP OSPF database command C. Its contents are the result of running the SPF algorithm D. The topology table contains feasible successor routes E. After convergence, the table only contains the lowest cost route entries for all known networks F. It is a link-state database that represents the network topology
A. When converged, all routers in an area have identical topology tables B. The table can be viewed via the show IP OSPF database command F. It is a link-state database that represents the network topology
Which statement is correct about multiarea OSPF?
Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers
Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? (Choose three.) A. OSPFv2 process number B. OSPFv2 type of network C. router ID D. interface priority E. subnet mask F. hello timer
B. OSPFv2 type of network E. subnet mask F. hello timer
What are two features of the OSPF routing protocol? (Choose two.) A. automatically summarizes networks at the classful boundaries B. used primarily as an EGP C. calculates its metric using bandwidth D. has an administrative distance of 100 E. uses Dijkstra's algorithm to build the SPF tree
C. calculates its metric using bandwidth E. uses Dijkstra's algorithm to build the SPF tree
What are two reasons for creating an OSPF network with multiple areas? (Choose two.) A. to ensure that area is used to connect the network to the internet B. to simplify configurations C. to reduce SPF calculations D. to provide areas in the network for routers that are not running OSPF E. to reduce use of memory and processor resources
C. to reduce SPF calculations E. to reduce use of memory and processor resources
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
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 networks
Which OSPF packet contains the different types of link-state advertisements?
LSU
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
What does the SPF algorithm consider to be the best path to a network?
The path that includes the fastest cumulative bandwidth links
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 lists of their LSDBs
What is used to create the OSPF neighbor table?
adjacency database
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 function is performed by the OSPF designated router?
dissemination of LSAs
What is the first criterion used by OPSF routers to elect a DR?
highest priority
What is identical on all OSPF routers within a single area?
link-state database
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
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 verification command would identify the specific interfaces on a router that were configured with the passive-interface command?
show IP protocols
Which command could be used on a router to ensure that an OSPF adjacency is formed with another router?
show ip ospf neighbor
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
Which criterion is preferred by the router to choose a router ID?
the router-id rid command
What is a function of OSPF hello packets?
to discover neighbors and build adjacency between them
