Term
| OSPF uses what multicast IP address to periodically send hello packets? |
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Definition
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Term
| In an OSPF packet header, what is the protocol ID number? |
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Definition
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Term
| Each LSA has its own aging timer, what is the default time (in minutes)? |
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Definition
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Term
| What is the default metric used by OSPF? |
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Definition
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Term
| Which type of OSPF packet has the following characteristics: sent reliably, have a sequence number & set lifetime, & aer periodically refreshed to confirm topology information before they age out? |
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Definition
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Term
| What type of OSPF router has all its interfaces in the same area? |
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Definition
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Term
| What type of OSPF router sits in the perimeter of teh backbone area 0 & has at least one interface connected to area 0 |
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Definition
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Term
| What type of OSPF router have interfaces attached to multiple areas, maintain separate LSDBs for each area to which they connect, & route traffic destine for or arriving from other areas? |
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Definition
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Term
| What type of OSPF router has at least one interface attached to a different routing domain (i.e. another OSPF autonomous system or a domain using EIGRP)? |
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Definition
| Autonomous System Boundary Router (ASBR) |
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Term
| What is another name for an OSPF LSDB? |
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Definition
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Term
| What is another name for an OSPF forwarding table? |
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Definition
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Term
| What are the tables that every OSPF router must maintain? |
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Definition
Neighbor table
Topology (LSDB) table
Routing (Forwarding) table |
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Term
| What is the name of the algorithm used by OSPF? |
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Definition
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Term
| What is the default administrative distance for OSPF? |
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Definition
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Term
| What are the 2 multicasting addresses used by OSPF? |
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Definition
224.0.0.5 (to all OSPF routers)
224.0.0.6 (to all DR) |
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Term
| When deploying OSPF, do point to point serial links require the election of the DR & a BDR? |
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Definition
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Term
| Name the 2 hierarchical layers used by OSPF |
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Definition
Backbone area - this is area 0
Regular (Normal) area |
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Term
| What type of packet does OSPF use to establish adjacencies? |
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Definition
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Term
| Can an OSPF LSU packet carry more than one LSA? |
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Definition
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Term
| List the 5 OSPF packet types. |
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Definition
Hello packet
Database Description packet
Link state request packet
Link state update packet
Link State Acknowledgement packet |
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Term
| List the information that is contianed in a Hello Packet. |
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Definition
Router ID
Hello Interval (10sec default multiaccess)
Dead Interval (4*Hello Int def for multiaccess)
Neighbors
Area ID
Router Priority - used when selecting DR & BDR
DR & BDR IP addresses
Authentication Password
Stub area flag |
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Term
What are the hello packet fields that must match on neighboring OSPF routers for them to establish an adjacency? |
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Definition
Hello & Dead Intervals
Area ID
Authentication Password
Stub Area Flag |
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Term
| If a link is a broadcast link does it require a DR & BDR to be selected before routers exchange link-state information? |
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Definition
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Term
| In what state is a master & slave relationship created between each router & its adjacent DR & BDR? |
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Definition
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Term
| List a summary of states that OSPF may pass through before beconing adjacent to (neighbors with) another router. |
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Definition
Down - noactive neighbor detected
Init - Hello packet received
Two-Way - router see its own ID in a received hello pkt
ExStart - master/slave roles determined
Exchange - DBD (Summary LSDB)sent
Loading - Exchange of LSRs & LSUs, to populate LSDB
Full - Neighbors fully adjacent
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