• Session Initialization Protocol (SIP) has clearly won as the leading IETF (internet engineering task force) standard which everyone is using to build Unified Communication applications. Now that the IETF has clearly defined this protocol and...

  • One of the most popular uses for a mailbox, other than sending and receiving email, is its calendaring capabilities. The calendaring features of Microsoft Outlook and Exchange 2007 are an essential part of most organizations’...

  • In “Part 2”, we solved a subnet masking problem using binary. This time, we’ll look at some helpful shortcuts that can make solving such problems faster and easier for most people (and less error-prone, as...

  • Virtual LANs (VLANs) seem to be one of the easiest topics to configure in the CCNA course. However, there can be some tricky things that are often overlooked. First, you must create your VLANs, then...

  • Unified Communications (UC) combines all forms of business communications into a single, unified system that provides powerful new ways to collaborate. Encompassing several communication systems or models, UC includes unified messaging, collaboration and interaction systems,...

  • The history of Unified Communications lies in the birth of voice over ip (VoIP) back in the late 1980’s and early 1990’s. We were all concentrating on toll bypass for enterprises to save money by...

  • In Subnetting Shortcuts- Part One, we reviewed the classful addressing scheme, and the purpose of a subnet mask.  Now let’s look at an example. Let’s say that you’ve been given an address space of 192.168.1.0/24,...

  • Many CCNA candidates have trouble with subnet masking (and some CCNP candidates, as well!). Over the next few weeks, we’ll learn some shortcuts that make subnet masking calculations easier. But first, a review … Recall...