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DNS & DHCP in Windows Explained

Technology Fundamentals

DNS & DHCP in Windows Explained

1 min readPublished 22 Jul 2026

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Active Directory cannot function without healthy DNS, and clients get their addressing from DHCP. Together they're the plumbing every Windows network relies on.

DNS — name resolution

Interactive explainer

How DNS Resolves a Name

From typing a web address to receiving an IP — step by step.

11. Check caches22. Recursive resolver33. Root & TLD servers44. Authoritative server55. Return & cache

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1. Check caches

Already known?

The browser and OS check their local DNS caches first. If the name is cached and not expired, the IP is returned instantly.

Check your understanding

1. What is checked first when resolving a name?

2. Which server returns the actual IP for a domain?

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DNS turns names into IP addresses. In a domain, clients locate Domain Controllers via SRV records in DNS — which is why "AD is broken" so often turns out to be a DNS problem.

DHCP — automatic addressing

Interactive explainer

How DHCP Assigns an Address (DORA)

Discover, Offer, Request, Acknowledge — how a device gets its IP.

11. Discover22. Offer33. Request44. Acknowledge

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1. Discover

Client shouts.

A client with no IP broadcasts a DHCP Discover to find any DHCP server on the network.

Check your understanding

1. What is the correct DHCP order?

2. What does a 169.254.x.x address indicate?

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DNS & DHCPNetworking Fundamentals CompTIA Network+
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DHCP hands clients an IP address, subnet mask, gateway and DNS servers automatically via the DORA exchange (Discover, Offer, Request, Acknowledge). Pointing clients at the wrong DNS server is a classic cause of domain issues.

Why it matters

DNS and DHCP are shared with our Networking Fundamentals path and are core Network+ and support topics. In a Windows domain, always suspect DNS first.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Most 'AD is down' tickets are really DNS. Employers check you troubleshoot addressing and naming methodically.

Technical questions
Why is DNS critical to Active Directory?+

Clients locate DCs via SRV records; without correct DNS they can't authenticate or apply policy.

Walk me through the DHCP DORA process.+

Discover (broadcast), Offer (server proposes), Request (client accepts), Acknowledge (lease confirmed).

Behavioural questions
Describe fixing a widespread connectivity issue.+

STAR: the outage, checking DHCP scope/DNS settings, and restoring service.

Real-world scenarios
“New machines can't join the domain but have internet access.”+

Expected answer: Check they're using the internal DNS servers (often a wrong DHCP-issued DNS) so they can resolve DC SRV records.

Common misconceptions

What candidates get wrong in interviews and on the job — and what strong professionals actually do.

Myth

'If the internet works, DNS is fine.'

Reality

clients may be using public DNS and can't resolve internal AD records.

Myth

'DHCP just gives an IP.'

Reality

it also supplies gateway and DNS — the wrong DNS breaks the domain.

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Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Help DeskDesktop SupportNetwork Administrator
Skills you're proving
DNSDHCPTroubleshooting
Recommended certifications
CompTIA A+CompTIA Security+
Career progression

Help Desk → Desktop Support → Network/Systems Administrator.

What employers expect

That you can diagnose naming and addressing issues quickly.

Frequently asked questions

Why does Active Directory depend on DNS?

Clients find Domain Controllers via SRV records in DNS; broken DNS breaks authentication and policy.

What is DORA?

The DHCP exchange: Discover, Offer, Request, Acknowledge — how a client leases an address.

A domain-joined PC can't log in — what do you check?

DNS first: is the client using the domain's DNS servers so it can locate a DC?

Related guides

Windows Fundamentals: Active Directory, Identity & AdministrationActive Directory Explained: Forests, Domains, OUs & ObjectsWindows Authentication: Kerberos vs NTLMLDAP Explained: How Apps Query the Directory

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