What is network address planning and IP management (IPAM)?
Why Interviewers Ask This
Candidates at the intermediate level are expected to not only know this concept but explain the trade-offs involved. Interviewers use this question to see if you can reason about design decisions, not just recall facts.
Answer
IP Address Management (IPAM) is the practice of planning, tracking, and managing the allocation of IP addresses in a network. Without proper IPAM, networks suffer from IP conflicts, address exhaustion, and poor documentation. IPAM includes: address inventory (tracking which IPs are assigned to which devices), DNS/DHCP management (DDI — DNS, DHCP, IPAM), subnet planning (CIDR allocation, VLSM, hierarchical addressing), and audit trails. Tools: phpIPAM (open-source), NetBox (open-source, also tracks devices/cables), Infoblox (enterprise DDI), BlueCat, Microsoft IPAM (Windows Server built-in). Best practices: document all allocations, reserve ranges for servers/network equipment/DHCP, use consistent naming conventions, and implement hierarchical addressing (summarizable routes reduce routing table size). IPAM becomes critical in organizations with thousands of devices and multiple sites.
Pro Tip
Demonstrate both theoretical understanding and practical experience. Say what it is, then give an example of how you actually used it in a Networking codebase.
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