Subnetting
Subnetting is the division of an IP address space into smaller logical networks by extending the network prefix.
Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
IPv6 subnetting is the division of an IPv6 address block into smaller subnetworks by allocating bits from the subnet identifier.
- How it is used
- Uses subnetting to create distinct /64 networks from an enterprise IPv6 /48 global routing prefix.
- How deep it goes
- Defines the /48, /64, subnet-identifier, and interface-identifier relationship, then demonstrates several subnet values without deeper configuration detail.
- Examples
- Demonstrates 2001:db8:8b00::/48 divided into /64 subnets using subnet identifiers 0x0000, 0x0001, and 0x0002.
- What you can do after
- Apply it to identify IPv6 subnet boundaries and enumerate /64 subnet addresses within a /48 allocation.
Read how Acing the CCNA Exam: Volume 1 Fundamentals and Protocols explains subnetting →
Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu
Subnetting is the process of dividing an IP network into smaller networks by extending its network prefix.
- How it is used
- Uses CIDR functions to design cloud network modules and allocate public, private, and isolated subnets.
- How deep it goes
- Explains CIDR prefixes, borrowed bits, ranges, and Terraform calls, then stops short of provider-specific networking research.
- Examples
- Demonstrates /16-to-/18 subdivision, Terraform console calls, and nested allocation for three cloud network segments.
- What you can do after
- Builds Terraform subnet allocations and switches between compatible public-private and three-segment network modules.
Related concepts
- subnetworkproduces · A subnetwork is a logical subdivision of an IP network with its own address range, routing scope, and network configuration.
- variable-length subnet maskingincludes · Variable-length subnet masking is a subnetting method that divides an address block into subnets of different sizes based on address requirements.
- fixed-length subnet maskingincludes · Fixed-length subnet masking is a subnetting technique that divides an address space into subnets of the same size.
- network segmentationkind of · Network segmentation is the division of a network into distinct physical or logical zones with controlled communication between them.
- borrowed bitused by · A borrowed bit is a host bit reassigned to the network portion of an IPv4 address during subnetting.
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