Managed DNS in London: are your performance and failover controls ready?

TL;DR: Managed DNS is framed as a way for London organisations to improve website performance, DNS security and high availability, with the article citing a one-second page-load delay as capable of reducing conversions by 7% according to DigiCert. The underlying message is that DNS governance now sits at the intersection of user experience, attack resilience and service continuity, not just infrastructure housekeeping.

NHIMG editorial — based on content published by DigiCert: Driving Digital Excellence in London with Managed DNS

By the numbers:

• A one-second delay in website loading time can result in a 7% reduction in conversions.

Questions worth separating out

Q: How should security teams govern DNS for identity-critical services?

A: Security teams should treat DNS as part of the access path and apply the same governance discipline used for certificates, federation and workload identities.

Q: Why does DNS security matter to IAM programmes?

A: DNS security matters because users and workloads must reach the right endpoint before authentication, certificate validation or API trust can work.

Q: What breaks when DNS failover is not tested regularly?

A: When failover is not tested, organisations can discover during an outage that secondary DNS serves stale records, missing entries or inconsistent responses.

Practitioner guidance

• Classify DNS as an identity dependency Document which authentication portals, certificate services, APIs and workload endpoints depend on each critical domain or subdomain.
• Enable DNSSEC on identity-critical zones Sign public zones that support login, federation, certificate validation or workload connectivity, and alert on validation failures.
• Test failover for access-path services Run continuity tests for primary and secondary DNS on the domains that serve customer access, SSO flows and machine-to-machine integrations.

What's in the full article

DigiCert's full blog post covers the operational detail this post intentionally leaves for the source:

• How managed DNS architecture supports load balancing, CDN integration and intelligent routing across production environments.
• Why DNSSEC is positioned to protect against DNS hijacking and unauthorized record modification in real deployments.
• How secondary DNS and failover reduce the impact of server failures or network disruptions on service access.
• The article's London-specific business framing for performance, security and high availability in a competitive market.

👉 Read DigiCert's article on managed DNS for performance, security and high availability →

Managed DNS in London: are your performance and failover controls ready?

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