cisco security training

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Qos Networking Inc
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• Firewall is a simply a system designed to
  prevent unauthorized access can be implemented in
  both hardware and software. This firewall does
  not allow unauthorized internet users from
  accessing private network connected to internet.
  Firewall provides logging and auditing function
  where a single block point security and audit can
  imposed .

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• Most of firewalls block traffic from outside that
  helps prevent hackers from logging in to machines
  on your network. Network layer firewalls makes
  their decision based on the source address,
  destination address and ports in individual IP
  packets. Now if we talking about application
  layer firewall then these are hosts running proxy
  servers, which permit no traffic directly between
  networks,

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These firewalls can be used as network address
translator ,since traffic goes in one side and
out other side and tend to enforce
more conservative security model s than network
layer firewalls. Early application firewalls are
not transparent to end user however, modern
firewalls are often transparent. For more
information about networking security please
visit www.qosnetworking .com.
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Address -QoS Networking 5
Southside Drive 11-284 Clifton park,
NY 12065 [phone] 15183731216
Email-training_at_qosnetworking.com