Guide to Firewalls and Network Security: Intrusion Detection and VPNs [Paperback] by Greg Holden (Author)

Guide to Firewalls and Network Security: Intrusion Detection and VPNs [Paperback] by Greg Holden (Author)

Paperback: 512 pages
Publisher: Course Technology; 1 edition (April 15, 2003)
Language: English
ISBN-10: 0619130393
ISBN-13: 978-0619130398
Product Dimensions: 9.1 x 7.4 x 1 inches
Shipping Weight: 1.6 pounds

INTRODUCTION
sniffing and spoofing are security threats that target the
lower layers of the networking infrastructure supporting
applications that use the Internet. Users do not interact
directly with these lower layers and are typically
completely unaware that they exist. Without a deliberate
consideration of these threats, it is impossible to
build effective security into the higher levels.
Sniffing is a passive security attack in which a machine
separate from the intended destination reads data on a
network. The term “sniffing” comes from the notion of
“sniffing the ether” in an Ethernet network and is a
bad pun on the two meanings of the word “ether.”
Passive security attacks are those that do not alter the
normal flow of data on a communication link or inject
data into the link

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