Join Todd Lammle for an in-depth discussion in this video Overview of port security, part of Cert Prep: Cisco Certified Entry Networking Technician (100-105).
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- It's usually not a good thing to have your switches…available for anyone to just plug in and play around.…I mean we worry about wireless security,…so why wouldn't we demand switch security just as much?…But just how do we actually prevent someone…from simply plug in a host into one of our switch ports?…Or worse, adding their hub switcher access point…into the Ethernet jack in their office.…By default, MAC addresses will just dynamically…appear in your MAC database.…You can stop them in their tracks by using port security.…
This graphic shows two hosts connected to the…single switch port FastEthernet 0/3…via either a hub or access point.…Port FastEthernet 0/3 is configured to observe…and allow only certain MAC addresses to associate…with this specific port.…So in this example, Host A is denied access,…but Host B is allowed to associate with the port.…By using port security, you can limit the number…of MAC addresses that are assigned to a port.…You can set static MAC addresses…and here's my favorite part,…set penalties for users who abuse your policy.…
For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- The TCP/IP networking model
- Easy subnetting
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Network address translation
Skill Level Intermediate
Internetworking devices4m 20s
3. Introduction to TCP/IP
4. Easy Subnetting
5. VLSM, Summarization, and Troubleshooting TCP/IP
6. Cisco Internetworking Operating System (IOS)
7. Managing a Cisco Internetwork
8. IP Routing
9. Layer 2 Switching
10. VLANs and InterVLAN Routing (IVR)
12. Network Address Translation (NAT)
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