Join Lisa Bock for an in-depth discussion in this video Network Address Translation (NAT), part of IT Security Foundations: Network Security.
- IPv4 was standardized in 1981…as we see in this request for comment 791.…An IPv4 address is a 32-bit, dotted decimal format.…If we think about the potential addresses,…it would be 2 to the 32nd power.…Let's ask Google.…Well that seems like a very large number and,…in 1981 this was a large number.…However, let's look at the reality.…
When we look at IPv4 classes and how they're allocated,…we see that they're separated into Class A, B, C, D, and E.…Class A is reserved for large companies,…and that's because there's a lot of available addresses…in that range.…Class B is for medium companies.…Class C for small companies,…as there aren't a lot of available addresses in that range.…Now Class D is reserved strictly for multicast.…
That would be, for example, an EIGRP announcement.…And Class E cannot be used at all.…That is experimental.…Early networks were not connected outside of the building,…so not much of a problem.…However,…efforts soon began after the Internet became public in 1992,…to conserve addresses.…In 1996 it was determined that a method called…
Note: This training maps to a number of the exam topics on the Microsoft Technology Associate (MTA) Security Fundamentals exam (98-367). See https://www.microsoft.com/learning/en-us/exam-98-367.aspx for more information.
- Explain how Network Access Protection (NAP) works.
- Recall how server and domain isolation provides extra protection.
- Describe how Network Address Translation (NAT) works.
- Differentiate between DNSSec and DNS.
- Recognize the threat of password attacks.
- Summarize how antivirus software protects your system against malware.
- Cite the three levels for software-restriction policies.