We will briefly review IPv4 addressing and CIDR and also have a look at the concept of address a A 32-bit IPv4 address (henceforth simply "IP address") consists of a network part and the hos etwork part are the leftmost k bits of an IP address, the host part are the remaining 32 - k bits on ery important question is how many bits should actually be allocated to the network part, i.e. wh of k shall be. Problem 2.1.4 (Choice of k). Assume that routers only store routing information about IP subnetworks and not individual hos looking only from this perspective, would you want to choose k small or large? What impact

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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2.1.3 Addressing and CIDR
We will briefly review IPv4 addressing and CIDR and also have a look at the concept of address aggregation.
A 32-bit IPv4 address (henceforth simply "IP address") consists of a network part and the host part. The
network part are the leftmost k bits of an IP address, the host part are the remaining 32 - k bits on the right. A
very important question is how many bits should actually be allocated to the network part, i.e. what the choice
of k shall be.
Problem 2.1.4 (Choice of k).
Assume that routers only store routing information about IP subnetworks and not individual hosts. When
looking only from this perspective, would you want to choose k small or large? What impact does this
choice have on the router's speed of processing and memory requirements?
In the early days of the Internet a scheme called “classful addressing" has been used, where the choices for
k were limited to k = 8 (for class-A addresses), k = 16 (for class-B addresses) and k = 24 (for class-C
addresses). It was possible to tell directly from an IP address to which class it belongs, as the entire address
space has been sub-divided into ranges:
Transcribed Image Text:2.1.3 Addressing and CIDR We will briefly review IPv4 addressing and CIDR and also have a look at the concept of address aggregation. A 32-bit IPv4 address (henceforth simply "IP address") consists of a network part and the host part. The network part are the leftmost k bits of an IP address, the host part are the remaining 32 - k bits on the right. A very important question is how many bits should actually be allocated to the network part, i.e. what the choice of k shall be. Problem 2.1.4 (Choice of k). Assume that routers only store routing information about IP subnetworks and not individual hosts. When looking only from this perspective, would you want to choose k small or large? What impact does this choice have on the router's speed of processing and memory requirements? In the early days of the Internet a scheme called “classful addressing" has been used, where the choices for k were limited to k = 8 (for class-A addresses), k = 16 (for class-B addresses) and k = 24 (for class-C addresses). It was possible to tell directly from an IP address to which class it belongs, as the entire address space has been sub-divided into ranges:
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