IPv4 and IPv6 Subnetting Concepts

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Questions and Answers

What is the impact of borrowing host bits when subnetting in IPv4?

Borrowing host bits to create subnets in IPv4 leads to more subnets but fewer hosts per subnet.

How many bits are designated for host addresses in an IPv6 address configuration?

In an IPv6 address, 64 bits are designated for host addresses.

What is the significance of a /64 subnet prefix in IPv6 networking?

A /64 subnet prefix allows for a large number of hosts while ensuring proper network configuration and supports automatic address configuration.

Why is it recommended not to borrow more than 64 bits for host addresses in IPv6?

<p>It is recommended to use 64 bits for host addresses because auto-configuration processes rely on this bit allocation.</p> Signup and view all the answers

What is the maximum number of subnets an organization can have with a /48 prefix in IPv6?

<p>An organization with a /48 prefix can have up to 65,535 subnets or /64 subnet prefixes.</p> Signup and view all the answers

How does classful IPv4 address differ from IPv6 addressing in terms of subnetting?

<p>Classful IPv4 addresses have specific bits allocated for network prefixes and host addresses, while IPv6 allows for a flexible allocation of bits for subnetting without compromising host addresses.</p> Signup and view all the answers

What is a potential drawback of borrowing host bits for subnetting in IPv4?

<p>Borrowing host bits for subnetting in IPv4 results in fewer available addresses for hosts on each subnet.</p> Signup and view all the answers

What is the default prefix length of a routing prefix in IPv6?

<p>The default routing prefix length in IPv6 is /64.</p> Signup and view all the answers

Why is it advised to use 64 bits for host addresses in IPv6 subnetting?

<p>Using 64 bits for host addresses in IPv6 ensures compatibility with auto-configuration processes.</p> Signup and view all the answers

What are the benefits of having a /48 prefix in IPv6 subnetting for an organization?

<p>A /48 prefix allows an organization to have up to 65535 /64 subnets, significantly expanding its network capacity.</p> Signup and view all the answers

Flashcards

IPv4 Classful Addressing

IPv4 addresses that are divided into classes (A, B, C) defining network and host bits.

IPv4 Subnetting

Dividing an IPv4 network into smaller subnets by borrowing host bits from the subnet mask, decreasing hosts per subnet.

IPv6 Subnetting

IPv6 uses 128 bits. The rightmost (host) portion (64 bits) is traditionally dedicated to hosts.

IPv6 /64 prefix

A specific IPv6 subnet identifier. The right 64 bits are for host addresses, meaning no compromise on host addresses (unlike IPv4).

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IPv6 /48 prefix

A larger IPv6 subnet that can support many /64 subnets, enabling the allocation of many smaller networks within a larger network.

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IPv4 Variable Length Subnet Masking (VLSM)

A technique in IPv4 to adjust the network mask to include or exclude host bits in a subnet.

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IPv4 Classful Addressing

IPv4 addresses are categorized into classes (A, B, C) to define network and host portions.

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IPv4 Subnetting

Dividing an IPv4 network into smaller subnets by adjusting host bits in the address.

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IPv6 Addressing Space

IPv6 uses 128 bits for addresses, offering a significantly larger space than IPv4.

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IPv6 Host Portion

The last 64 bits in an IPv6 address are reserved for host identification.

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IPv6 Subnetting Benefit

IPv6 subnetting doesn't reduce host addresses, unlike IPv4.

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IPv6 /64 Prefix

A subnet identifier in IPv6 using 64 bits for the host portion.

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IPv6 /48 Prefix

An IPv6 subnet identifier allowing for many /64 subnets.

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IPv6 Autoconfiguration

Requires 64 bits for host addresses to automatically configure themselves.

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Study Notes

IPv4 Subnetting

  • IPv4 addresses are classful, meaning assigned network prefixes and host portions are predefined (e.g., Class A, Class B).
  • Subnetting in IPv4 involves borrowing host bits to create multiple subnets.
  • This reduces the number of host addresses per subnet.

IPv6 Subnetting

  • IPv6 addresses use 128 bits.
  • The last 64 bits are dedicated to hosts. This means no host bits are sacrificed when creating subnets
  • No compromise when subnetting.
  • Subnetting in IPv6 uses the same concept as VLSM (Variable Length Subnet Masking) in IPv4.
  • A /64 prefix is a common routing prefix, dedicated for host addresses.
  • /48 prefix allows for approximately 65,535 subnets.
  • Each /64 subnet can support a large number of hosts (2^64).
  • Auto-configuration benefits from using 64 bits for hosts.
  • Organizations can further subnet beyond the 16-bit subnet ID but 64-bit host space is recommended.

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