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Title:MicroNugget: What are IPv4 Wildcard Masks?
Duration:06:33
Viewed:23,965
Published:06-06-2012
Source:Youtube

Start learning cybersecurity with CBT Nuggets. https://courses.cbt.gg/security In this video, Keith Barker covers Wildcard Masks: what they do, how they do it, and in what situations you should employ this tool. This allows you to tell an access list entry that you’re concerned about identifying a single subnet on a remote network. Computing is all about specificity, but sometimes you don’t need to outline every single aspect of a particular feature. A Wildcard Mask’s responsibility is to identify some components of an IP address that you don’t care about and then apply policies to them based on values you didn’t explicitly specify. For example, let’s say you’re going to deny any traffic sourced from the 172.16.56.0 network. You’ll need to create an access control list, but if you’re dealing with a 24-bit network, you’re looking at 254 distinct possibilities. You want to write the policy so that you discriminate against IP addresses based on the first three values, but don’t care about the last one. That’s where a Wildcard Mask comes into play. 🌐 Download the Free Ultimate Networking Cert Guide: https://blog.cbt.gg/5krf ⬇️ 13-Week Study Plan: CCNA (200-301): https://blog.cbt.gg/5c3d Start learning with CBT Nuggets: • Intro to Networking | https://courses.cbt.gg/tuv • Cisco CCDA Design (200-310 DESGN) | https://courses.cbt.gg/0tv • Cisco CCNA Service Provider (640-875 SPNGN1 & 640-878 SPNGN2) | https://courses.cbt.gg/589 • Cisco CCNA Wireless (200-355 WIFUND) | https://courses.cbt.gg/w49



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