...their population. Another major social change seems to be a human technological revolution that led to changes in economic activity, social structure and other ideas. (Goodman and Armelagos, 1985: 94) There are several factors that made possible the tracing of changing health patterns from preagricultural to postagricultural subsistence patterns. The first of these being that the skeletal reamains that were recovered were transported to the University of Massachusetts at Amherst to be analyzed. The second factor was the ability to distinguish indiviuals who lived before the rise of agriculture and those who lived after based on burial placement. The third factor was that dental traits exhibited in the individuals showed that the genetic makup of the population remained steady through the rise of agructlture dispite evidence of trade. (Goodman and Armelagos, 1985: 94) Several studies were done to determine if the rise of agriculture lead to a better diet and improved health conditions. One study of shin bone lesions suggested and increase in affected individuals after the agriculture was introduced. This evidence was corroborated by another study of the appearance of hypoplasia in the teeth. Signs of anemia and arm fractures were also found to be more common in individual who lived after the introduction of agriculture. These factors point to agriculture having a negative impact on health conditions for populations living around the Dickson’s Mounds. (Goodman and Armelagos, 1985:...
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...CHaPTer Firewall Fundamentals 2 T O SOME NETWORK ADMINISTRATORS, A FIREWALL is the key component of their infrastructure’s security. To others, a fi rewall is a hassle and a barrier to accomplishing essential tasks. In most cases, the negative view of fi rewalls stems from a basic misunderstanding of the nature of fi rewalls and how they work. This chapter will help dispel this confusion. This chapter clearly defi nes the fundamentals of fi rewalls. These include what a fi rewall is, what a fi rewall does, how it performs these tasks, why fi rewalls are necessary, the various fi rewall types, and fi ltering mechanisms. Once you understand these fundamentals of fi rewalls, you will able to look beyond the unschooled opinions, common mythology, and marketing hype surrounding them, and the crucial benefi ts of effective fi rewall architecture will become clear. Like any tool, fi rewalls are useful in solving a variety of particular problems and in supporting essential network security. Chapter 2 Topics This chapter will cover the following topics and concepts: • What a fi rewall is • Why you need a fi rewall • How fi rewalls work and what they do • What the basics of TCP/IP are • What the types of fi rewalls are • What ingress and egress fi ltering is • What the types of fi rewall fi ltering are • What the difference between software and hardware fi rewalls is • What dual-homed and triple-homed fi rewalls...
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...CHaPTer Firewall Fundamentals 2 T O SOME NETWORK ADMINISTRATORS, A FIREWALL is the key component of their infrastructure’s security. To others, a fi rewall is a hassle and a barrier to accomplishing essential tasks. In most cases, the negative view of fi rewalls stems from a basic misunderstanding of the nature of fi rewalls and how they work. This chapter will help dispel this confusion. This chapter clearly defi nes the fundamentals of fi rewalls. These include what a fi rewall is, what a fi rewall does, how it performs these tasks, why fi rewalls are necessary, the various fi rewall types, and fi ltering mechanisms. Once you understand these fundamentals of fi rewalls, you will able to look beyond the unschooled opinions, common mythology, and marketing hype surrounding them, and the crucial benefi ts of effective fi rewall architecture will become clear. Like any tool, fi rewalls are useful in solving a variety of particular problems and in supporting essential network security. Chapter 2 Topics This chapter will cover the following topics and concepts: • What a fi rewall is • Why you need a fi rewall • How fi rewalls work and what they do • What the basics of TCP/IP are • What the types of fi rewalls are • What ingress and egress fi ltering is • What the types of fi rewall fi ltering are • What the difference between software and hardware fi rewalls is • What dual-homed and triple-homed fi rewalls...
Words: 15354 - Pages: 62
...CHAPTER Firewall Fundamentals 2 T o some network administrators, a firewall is the key component of their infrastructure’s security. To others, a firewall is a hassle and a barrier to accomplishing essential tasks. In most cases, the negative view of firewalls stems from a basic misunderstanding of the nature of firewalls and how they work. This chapter will help dispel this confusion. This chapter clearly defines the fundamentals of firewalls. These include what a firewall is, what a firewall does, how it performs these tasks, why firewalls are necessary, the various firewall types, and filtering mechanisms. Once you understand these fundamentals of firewalls, you will be able to look beyond the unschooled opinions, common mythology, and marketing hype surrounding them, and the crucial benefits of effective firewall architecture will become clear. Like any tool, firewalls are useful in solving a variety of problems and in supporting essential network security. Chapter 2 Topics This chapter covers the following topics and concepts: • What a firewall is • Why you need a firewall • How firewalls work and what they do • What the basics of TCP/IP are • What the types of firewalls are • What ingress and egress filtering is • What the types of firewall filtering are • What the difference between software and hardware firewalls is • What dual-homed and triple-homed firewalls are • What the best placement of a firewall is 43 Chapter 2 Goals When you complete...
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