Firewalls act like the security guards of a network, analyzing all attempts to connect to systems on a network and determining whether the request should be allowed or denied according to the organization’s security policy. In this video, earn the basic functioning of a firewall, including the implicit deny principle.
- [Instructor] If routers and switches…are the connectivity building blocks of a network,…firewalls are the security workhorses.…Firewalls act like the security guards of a network,…analyzing all attempts…to connect to systems on the network…and determining whether those requests…should be allowed or denied,…according to the organization's security policy.…Firewalls often sit at the network perimeter,…in-between an organization's routers and the internet.…From this network location, they can easily see…all inbound and outbound connections.…
Traffic on the internal network may flow…between trusted systems unimpeded,…but anything crossing the perimeter…to or from the internet…must be evaluated by the firewall.…Firewalls often connect three networks together,…the internet, an internal network,…and a special purpose network…known as the demilitarized zone, or DMZ.…The DMZ contains systems that must accept…direct connections from the outside world,…such as public web servers.…The DMZ isolates those systems…because they are at higher risk of compromise.…
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- TCP/IP networking
- Network security devices
- Switches and routers
- Content distribution networks
- Storage networks
- Securing networks
- Network attacks
- Wireless networking and security
Skill Level Intermediate
Q: This course was updated on 07/27/2018. What changed?
A: New videos were added that cover network relationships and security device placement.
Insights from a Cybersecurity Professionalwith Mike Chapple32m 15s Intermediate
Networks and communications1m 31s
1. TCP/IP Networking
2. Network Security Devices
3. Designing Secure Networks
4. Specialized Networking
5. Secure Network Management
6. Network Attacks
7. Wireless Networking
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