Start the configuration which enables OSPFv2 on some interfaces by using ________________ commands.
Send and receive Hellos
Network
SPF calculations
Show ip ospf neighbor
The primary purpose of the router LSA is to describe a router. The contents of this type of LSA are…
DR and BDR IP address, subnet ID, mask
Subnet ID, mask, RID of ABR that advertises the LSA
RID, interfaces, IP address/mask, current interface state (status)
All of the above
It is common to have all routers use OSPF. One router knows about a connected, static, and OSPF route for a single subnet. The router then has to choose one to use. It will choose the connected route by default because it has a ____________ administrative distance (AD)
Higher
Lower
The IOS uses which formula to choose an interface’s OSPF cost?
Reference_bandwidth/Interface_bandwidth
Interface_bandwidth/Reference_bandwidth
There is no formula, the engineer can predict the cost based on the SPF algorithm
Cisco recommends making the OSPF reference bandwidth setting different on all OSPF routers in an enterprise network.
Using multiple areas improves OSPF operations in many ways for larger networks. Which of the following is a key point argument for the use of multiple areas in larger OSPF networks?
The smaller per-area LSDB requires more memory
Routers require more CPU cycles to process the smaller per-area LSDB with the SPF algorithm, reducing CPU overhead and reducing convergence time
Changes in the network (for example, links failing and recovering) requires SPF calculations only on routers connected to the area where the link changed state, reducing the number of routers that must rerun SPF
More information must be advertised between areas, reducing the bandwidth required to send LSAs
The SPF algorithm calculates all possible routes from the router to the destination subnet. If more than one route exists, the router compares the metrics, picking the best (lowest) metric route to add to the routing table.
A set of routers and links that share the same detailed LSDB information, but not with routers in other areas, for better efficiency, is knows as what OSPF term?
Area
Area Boarder Router (ABR)
Internal Router
Backbone Router
What is Step 1 for the OSPF configuration?
Configure one or more network ip-address wildcard-mask areaarea-id router subcommands, with any matched interfaces being enabled for the OSPF process and being assigned to the listed area
Enter OSPF configuration mode for a particular OSPF process using the router ospf process-id global command
Configure any OSPF interfaces as passive if no neighbors can or should be discover on the interface, using the passive-interfacetype number interface subcommand
Configure the router-id id-value router subcommand
Which command lists a summary of the LSAs in the database, with one line of output per LSA? It is originated by LSA type (first type 1, then type 2 and so on).
Show ip ospf
Show ip protocols
Show ip ospf interface brief
Show ip ospf database
