Questions and Answers
What does IANA stand for?
Internet Assigned Numbers Authority
What are RIRs?
Regional Internet Registries
There are two strategies the RIRs use to allocate IP address space: the legacy strategy called ___, and the current strategy of ___.
Classful; Classless
What is Classful Addressing?
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How was Classful addressing how the early Internet was ____?
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In Classful addressing, IP assignments were given on the ___.
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If you needed ___ IP addresses, a ___ IP address block from the Class C range would be assigned.
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If you needed ___ IP addresses, a ___ IP address block from the Class B range would be assigned.
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If you needed ___ IP addresses, a ___ IP address block from the Class A range would be assigned.
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How many IP addresses per block does Class C have?
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How many IP addresses per block does Class B have?
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How many IP addresses per block does Class A have?
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What is the Subnet Mask for each Block in Class C?
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What is the Subnet Mask for each Block in Class B?
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What is the Subnet Mask for each Block in Class A?
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How did the Classful Address system waste IPs?
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What was often done to account for the wasting of IPs in the Classful Address system?
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What addressing system was created to counteract the problem of wasted IPs in Classful Addressing?
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Today, in 2022, Classful IP Addressing architecture is employed ____.
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What does it mean when certain archaic protocols or devices operate classfully?
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Study Notes
IANA
- Responsible for global IP address space allocation (0.0.0.0 - 255.255.255.255).
RIRs
- Designated by IANA, these organizations allocate IP addresses based on geographical regions.
RIR Address Allocation Strategies
- Legacy strategy: Classful
- Current strategy: Classless (Classless Inter-Domain Routing, CIDR).
Classful Addressing
- Adheres to network class distinctions using specific bits for network information:
- Class A: first 8 bits
- Class B: first 16 bits
- Class C: first 24 bits.
Formation of Early Internet
- Classful addressing was the foundational method for IP assignment.
IP Assignment Boundaries
- IP addresses were assigned on octet boundaries.
Classful Addressing Requirements
- For 200 IPs, a /24 block (Class C) is assigned.
- For 50,000 IPs, a /16 block (Class B) is assigned.
- For 65,000 IPs, a /8 block (Class A) is assigned.
IP Address Capacity by Class
- Class C: 256 addresses per block.
- Class B: 65,536 addresses per block.
- Class A: 16,777,216 addresses per block.
Subnet Masks
- Class C: 255.255.255.0 (/24).
- Class B: 255.255.0.0 (/16).
- Class A: 255.0.0.0 (/8).
IP Wastage in Classful Addressing
- Assigning Class B for 300 IP requirement leads to wasting around 60,000 IPs.
Addressing Scenarios
- Companies needing 300 IPs might use two /24 blocks from Class C instead of one Class B, but still waste IPs for larger needs.
Invention of CIDR
- Classless Inter-Domain Routing (CIDR) was developed to mitigate IP wastage issues in Classful Addressing.
Current Relevance of Classful Addressing
- As of 2022, Classful IP Addressing architecture is not in use.
Classful Protocols
- Some outdated protocols assume subnet masks based on IP address classes, e.g., Class C with assumed mask 255.255.255.0 for IP address 199.22.33.4.
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Test your knowledge of classful addressing with these informative flashcards. Explore key terms such as IANA and RIRs, and understand the functions of these organizations in IP address allocation. Expand your understanding of Internet addressing concepts!
