The science of making skyscrapers safe.

To the discerning eye, cities and skyscrapers are monuments to the security threats prominent at the time they're built. With new technologies, shortsighted design decisions will leave a legacy of needless challenges for future generations. More…

Cisco administration 101: Understanding Ethernet MAC addresses

While you're probably familiar with Ethernet MAC addresses, how much do you know about working with them in the Cisco IOS? In this edition of Cisco Routers and Switches, David Davis tells you how to determine the MAC address, change it, and use it to filter traffic. More…