Firewall
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FIREWALL
PRESENTED BY: SACHITANAND BHARDWAJ PRN NO.060341053
WHAT IS A FIREWALL? A firewall is hardware, software, or a combination of both that is used to prevent unauthorized programs or Internet users from accessing a private network and/or a single computer.
Hardware & Software Firewalls Hardware Firewalls Protect an entire network Usually more expensive, harder to configure Implemented on the router level Software Firewalls Protect
a single computer Usually less expensive, easier to configure
Firewall Rules Allow – traffic that flows automatically
because it has been deemed as “safe” Block – traffic that is blocked because it has been deemed dangerous to your computer Ask – asks the user whether or not the traffic is allowed to pass through
How does a software firewall work? Inspects each individual “packet” of
data as it arrives at either side of the firewall Inbound to or outbound from your computer Determines whether it should be allowed to pass through or if it should be blocked
FIREWALL TECHNIQUES Packet filter: Looks at each packet entering or
leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation. Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.
What a personal firewall can do Stop hackers from accessing your
computer Protects your personal information Blocks “pop up” ads and certain cookies Determines which programs can access the Internet
What a personal firewall cannot do Cannot prevent e-mail viruses Only
an antivirus product with updated definitions can prevent e-mail viruses.
After setting it initially, you can forget
about it The
firewall will require periodic updates to the rule sets and the software itself.
THANK YOU
PRESENTED BY: SACHITANAND BHARDWAJ PRN NO.060341053
WHAT IS A FIREWALL? A firewall is hardware, software, or a combination of both that is used to prevent unauthorized programs or Internet users from accessing a private network and/or a single computer.
Hardware & Software Firewalls Hardware Firewalls Protect an entire network Usually more expensive, harder to configure Implemented on the router level Software Firewalls Protect
a single computer Usually less expensive, easier to configure
Firewall Rules Allow – traffic that flows automatically
because it has been deemed as “safe” Block – traffic that is blocked because it has been deemed dangerous to your computer Ask – asks the user whether or not the traffic is allowed to pass through
How does a software firewall work? Inspects each individual “packet” of
data as it arrives at either side of the firewall Inbound to or outbound from your computer Determines whether it should be allowed to pass through or if it should be blocked
FIREWALL TECHNIQUES Packet filter: Looks at each packet entering or
leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation. Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.
What a personal firewall can do Stop hackers from accessing your
computer Protects your personal information Blocks “pop up” ads and certain cookies Determines which programs can access the Internet
What a personal firewall cannot do Cannot prevent e-mail viruses Only
an antivirus product with updated definitions can prevent e-mail viruses.
After setting it initially, you can forget
about it The
firewall will require periodic updates to the rule sets and the software itself.
THANK YOU
