What's the difference between a MAC address and IP address?Ī MAC address and an IP address each identify network devices, but they do the job at different levels.What are the most important email security protocols?Įmail was designed without security considerations, but these top email security protocols add mechanisms to keep messaging safe from threats.Internet protocols for email authentication - SPF, DKIM and DMARC - coordinate defense against spammers, phishing and other spoofed email problems. Email authentication: How SPF, DKIM and DMARC work together. A network protocol is a set of established rules that specify how to format, send and receive data so that computer network endpoints, including computers, servers, routers and virtual machines, can communicate despite differences in their underlying infrastructures, designs or standards.
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