Port isolation, also known as private VLANs, is a network security technique that restricts the ability of devices plugged into a particular network port to communicate. In this video, learn how port isolation can increase network security, particularly in cases where users of the network might not be trusted.
- [Instructor] Port isolation…is a network security technique…that is particularly useful when…users of the network do not trust each other…and are not trusted themselves.…I'm using the term port isolation in this video…because it's used in the CISSP body knowledge.…Networking professions typically call this technology…private VLANS.…Port isolation and private VLANs are the same thing.…The way that port isolation works is pretty simple.…
When configured on the switch,…port isolation limits traffic from a device…plugged into a particular port to a single destination port.…For example, if port isolation is turned on and configured…so that a network port is only able to communicate with…the uplink port, used to connect a switch…to the rest of the network.…Systems plugged into the isolated port…will be unable to communicate with other devices…on the same switch using the data link layer.…
Why would you want to do this?…Port isolation prevents devices on the same switch…from communicating with each other.…This blocks many types of attacks, such as ARP spoofing,…
Note: This course is part of a series releasing throughout 2018. A completed learning path of the series will be available once all the courses are released.
- How IP addresses are assigned and managed
- Multilayer protocols
- VPNs and VPN concentrators
- Designing secure networks
- Firewall management techniques
- Maintaining network availability
- Software defined networking (SDN)
- Port isolation
- Network attacks
- How Wi-Fi networks function
- WPA, WPS, and propagation attacks
- Host-based network security control
Skill Level Advanced
Insights from a Cybersecurity Professionalwith Mike Chapple32m 15s Appropriate for all
1. TCP/IP Networking
2. Network Security Devices
3. Designing Secure Networks
4. Specialized Networking
5. Secure Network Management
6. Virtualized Networks
Port isolation1m 47s
7. Network Attacks
8. Transport Encryption
9. Wireless Networking
10. Host Security
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