Module 7
When Sources Disagree
A router offered the same destination three times installs one of them. The order of the three tests, the protocols that lose, and the gateway that is itself a single point of failure.
In this module
- Apply prefix length, administrative distance and metric in the right order
- Recognise a floating static route configured at the wrong distance
- Explain what a classful protocol does to a subnetted network
- Describe how two routers share one gateway address
Activities
When two protocols disagree
Prefix length, then administrative distance, then metric.
Static route outranks OSPF
A backup path that has been carrying live traffic all along.
The protocol that loses your subnet masks
RIP running happily while the LANs cannot reach each other.
Selective static redistribution
One route into OSPF, one deliberately withheld.
Small packets fine, large packets gone
A link that passes a ping and drops a file transfer.
When the default gateway is the single point of failure
Two routers, one virtual address, and a MAC that moves.
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Curriculum topics
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