The whole category in one page.
ROUTING IS POLICY BEFORE IT IS GEOGRAPHY
The commercially preferred path is chosen, not the shortest. Local exchange points are why local traffic no longer travels to Europe and back.
Ask any provider how many transit providers they have, who they peer with, and which exchanges they attend.
LATENCY MATTERS MORE THAN BANDWIDTH FOR MOST WORKLOADS
Which is why proximity, exchange presence and modern protocols matter more than headline speeds.
PROPAGATION IS CACHES EXPIRING, NOT DATA SPREADING
There is nothing to accelerate. And badly operated DNSSEC makes a domain unreachable rather than merely unverified.
MONITOR CERTIFICATE EXPIRY FROM OUTSIDE YOUR OWN AUTOMATION
Silent renewal failure is among the commonest causes of complete outage.
ONE COMPROMISED MAIL ACCOUNT DESTROYS EVERY CUSTOMER'S DELIVERABILITY
Automatic per-account limits are essential, because the damage occurs in minutes.
RAID, REPLICATION AND SNAPSHOTS ARE NOT BACKUPS
Each protects against one failure mode and none against deletion, corruption or ransomware. Keep a copy the live system cannot reach, and test restoring it.
