25 - OSPF Part 2 Flashcards
Configure all interfaces to be OSPF passive interfaces by default:
R1(config-router)# […]
passive-interface default
Configure the bandwidth of an interface:
R1(config-if)# […]
bandwidth <kilobits-per-second></kilobits-per-second>
Configure the OSPF cost of an interface:
R1(config-if)# […]
ip ospf cost <cost></cost>
Configure the OSPF reference bandwidth:
R1(config-router)# […]
auto-cost reference-bandwidth <megabits-per-second></megabits-per-second>
Does the bandwidth command change the speed at which an interface operates?
No
(the speed command does)
Enable OSPF directly on an interface:
R1(config-if)# […]
ip ospf <process-id> area <area-id></area-id></process-id>
If a router receives an OSPF Hello packet but its own router ID is not in the Hello packet, the neighbor state is […].
Init
If no Hello messages have been received, the OSPF neighbor state is […].
Down
In the OSPF […] state, routers exchange DBDs which contain a list of LSAs in their LSDB.
Exchange
In the OSPF […] state, routers send LSR messages to request LSAs from their neighbor.
Loading
In the OSPF […] state, the routers have a full OSPF adjacency and identical LSDBs.
Full
In the OSPF Exstart state, which router becomes the Master?
The router with the higher router ID.
In the OSPF Exstart state, which router becomes the Slave?
The router with the lower router ID
In which OSPF neighbor state are a Master and Slave determined?
Exstart
OSPF DR/BDRs are elected in the […] neighbor state.
2-way
OSPF Hello messages are multicast to […]
224.0.0.5
OSPF LSAs are sent in […] messages.
LSU
OSPF Message type 1 = […]
Hello
OSPF Message type 2 = […]
Database Description (DBD)
OSPF Message type 3 = […]
Link-State Request (LSR)
OSPF Message type 4 = […]
Link-State Update (LSU)
OSPF Message type 5 = […]
Link-State Acknowledgement (LSAck)
OSPF Message type […] = Database Description (DBD)
2
OSPF Message type […] = Hello
1
OSPF Message type […] = Link-State Acknowledgement (LSAck)
5
OSPF Message type […] = Link-State Request (LSR)
3
OSPF Message type […] = Link-State Update (LSU)
4
OSPF neighbor states:
1. […]
2. […]
3. […]
4. Exstart
5. Exchange
6. Loading
7. Full
Down
Init
2-way
OSPF neighbor states:
1. Down
2. […]
3. […]
4. […]
5. Exchange
6. Loading
7. Full
Init
2-way
Exstart
OSPF neighbor states:
1. Down
2. Init
3. 2-way
4. […]
5. […]
6. […]
7. Full
Exstart
Exchange
Loading
OSPF neighbor states:
1. Down
2. Init
3. 2-way
4. Exstart
5. […]
6. […]
7. […]
Exchange
Loading
Full
OSPF neighbor states:
1. Down
2. Init
3. […]
4. […]
5. […]
6. Loading
7. Full
2-way
Exstart
Exchange
OSPF: What does DBD stand for?
Database Description
OSPF: What does LSAck stand for?
Link State Acknowledgement
OSPF: What does LSR stand for?
Link State Request
OSPF: What does LSU stand for?
Link State Update
What is the default OSPF Dead timer on an Ethernet connection?
40 seconds
What is the default OSPF Hello timer on an Ethernet connection?
10 seconds
What is the default OSPF reference bandwidth?
100 mbps
What is the formula to calculate OSPF interface cost?
Reference bandwidth / interface bandwidth = cost
What is the multicast address for all OSPF routers?
224.0.0.5
What is the OSPF cost of a 10Gig Ethernet interface with the default reference bandwidth?
1
What is the OSPF cost of a FastEthernet (100 mbps) interface with the default reference bandwidth?
1
What is the OSPF cost of a Gigabit Ethernet interface with the default reference bandwidth?
1
What is the OSPF cost of a loopback interface?
1
What is the OSPF cost of an Ethernet (10 mbps) interface with the default reference bandwidth?
10
When an OSPF router receives a Hello packet with its own router ID, the OSPF neighbor state is […].
2-way
