Network+ (N10-009) · ELI Explains IP Addresses (book)
Static and Dynamic Addresses
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In 30 seconds
This chapter covers the distinction between manually assigned and automatically assigned IP addresses.
The college version
Static IP Address
What It Is
An IP address manually configured by an administrator that does not change unless someone explicitly modifies it.
What It Does
Provides a stable, predictable address for servers and infrastructure that other devices must find consistently.
Where It Is Used
Web servers, email servers, printers, cameras, and DNS servers use static addresses for reliability.
ELI Explains
A static IP is like your name written on your desk in permanent marker. Everyone always knows where to find you — your spot never changes. Reliable, but moving means someone must erase and rewrite it.
A 10-Year-Old's Example
The school office is Room 101 — always has been, never changes. Students move classrooms yearly, but the office doesn't. That's a static address: always there, always the same.
Remember This
A static IP is manually set, doesn't change — use when a device must always be found at the same address.
Dynamic IP Address
What It Is
An IP address automatically assigned by DHCP from a pool, which may change when the lease expires or the device reconnects.
What It Does
Simplifies management by auto-configuring devices, reusing addresses, preventing conflicts — no manual setup.
Where It Is Used
Laptops, phones, tablets, TVs, and game consoles use dynamic addresses on home and public Wi-Fi.
ELI Explains
A dynamic IP is like getting a different hotel room each time you check in. The desk assigns whatever is available. You don't care which — you just need a working room. When you leave, someone else gets that number.
A 10-Year-Old's Example
At the library, you don't have a permanent seat. Each day, you sit where there's space. DHCP works the same — devices grab an available address, no reservations needed.
Remember This
Dynamic IPs are auto-assigned by DHCP, may change — the default for most consumer devices.
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