INTEGRANTE: Daniel Orozco Ochoa
FIREWALL
The term "fire wall" originally
meant, and still means, a fireproof wall intended to prevent the spread of fire
from one room or area of a building to another. The Internet is a volatile and
unsafe environment when viewed from a computer-security perspective, therefore "firewall"
is an excellent metaphor for network security.
In computer networking, the term firewall is
not merely descriptive of a general idea.
The most important aspect of a firewall is that
it is at the entry point of the networked system it protects. In the case of
Packet Filtering, it is at the lowest level, or "layer" in the
hierarchy (stack) of network processes, called the Network Layer or the
Internet Layer. This means essentially that the firewall is the first program
or process that receives and handles incoming network traffic, and it is the
last to handle outgoing traffic.
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