Problem 2.1.5 (Find the address ranges). For each of the three main classes (A,B,C) find the precise address ranges and identify how many hosts can theoretically be in a network of the respective class. For class C please consider both the cases where classes D and E are excluded and where they are included into class C. This has proved to be very inflexible and led to poor utilization of the address space. In particular, after the (few) class-A addresses have been allocated to companies and organisations helping to pioneer the Internet, people urned to class-B addresses. However, only few organizations having a class-B address really have 65,534 different end hosts, leaving large parts of the address space un-utilized. And resorting to class-C addresses lew up routing tables in routers, straining their memory and leading to larger lookup times.

Problem 2.1.5 (Find the address ranges). For each of the three main classes (A,B,C) find the precise address ranges and identify how many hosts can theoretically be in a network of the respective class. For class C please consider both the cases where classes D and E are excluded and where they are included into class C. This has proved to be very inflexible and led to poor utilization of the address space. In particular, after the (few) class-A addresses have been allocated to companies and organisations helping to pioneer the Internet, people urned to class-B addresses. However, only few organizations having a class-B address really have 65,534 different end hosts, leaving large parts of the address space un-utilized. And resorting to class-C addresses lew up routing tables in routers, straining their memory and leading to larger lookup times.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Fundamentals of memory

A collection of connected storage devices form the memory unit. It is a space to store data and instructions required for processing. Information is stored in a memory unit in the form of bits. There are two types of memory namely:

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Can someone help me with the problem 2.1.5? Thanks

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:
• The leftmost bit of a class A address is 0
• The leftmost two bits of a class B address are 10
• The leftmost three bits of a class C address are 110
There is a fourth address range for multicast addresses (class D), where the leftmost four bits are 1110 and
the remaining bits being completely allocated to a multicast group address, and a fifth address range (class E,
leftmost four bits are 1111) for experimental purposes.

Problem 2.1.5 (Find the address ranges).
For each of the three main classes (A,B,C) find the precise address ranges and identify how many hosts
can theoretically be in a network of the respective class. For class C please consider both the cases where
classes D and E are excluded and where they are included into class C.
This has proved to be very inflexible and led to poor utilization of the address space. In particular, after the (few)
class-A addresses have been allocated to companies and organisations helping to pioneer the Internet, people
turned to class-B addresses. However, only few organizations having a class-B address really have 65,534
different end hosts, leaving large parts of the address space un-utilized. And resorting to class-C addresses
blew up routing tables in routers, straining their memory and leading to larger lookup times.

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