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CISSP study material · question 34 of 500

An enterprise peers with an upstream provider and mistakenly advertises routes for its internal 10.0.0.0/8 space. The provider's router silently drops the advertisement, and the enterprise operations team raises a ticket claiming the peer is generating routing protocol errors. How should this behaviour be characterised?

• Network security
• Security operations

1. Advertising private routes to a provider is acceptable once the provider accepts them through an inbound policy exception.
2. Filtering the private route advertisement is expected, and the discard is deliberately treated as something other than a protocol error.
3. Advertising private routes across the link is acceptable provided packets carrying those addresses are dropped at the border.
4. Filtering the private route advertisement is expected, but the discard has to be signalled back to the peer as a protocol error.

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