WAN Basics
In this Lesson, we’ll discuss the WAN. We’ll start by defining what a WAN is, and then move on to talking about basic technology such as WAN devices and circuit and packet switching. also cover transmission options from POTS (plain old telephone service) to Frame Relay, to leased lines, and more.
Finally, we’ll discuss wide area requirements including a section on minimizing WAN charges with bandwidth optimization features.
By default, routing protocols such as RIP exchange routing tables every 30 seconds. If placed as calls, these routine updates will drive up WAN costs unnecessarily, and Snapshot
Wide – Area Network Requirements – Minimize bandwidth costs – Maximize efficiency – Maximize performance – Support new/emerging applications – Maximize availability – Minimize management and maintenance Manage Bandwidth to Control Cost Because transmission
Analog services are the least expensive type of service. ISDN costs somewhat more but improves performance over even the fastest current analog offerings. Leased lines are the costliest
X.25 Devices X.25 networks implement the internationally accepted ITU-T standard governing the operation of packet switching networks. Transmission links are used only when needed. X.25 was designed almost
Leased Line Leased lines are most cost-effective if a customer’s daily usage exceeds four to six hours. Leased lines offer predictable throughput with bandwidth typically 56 Kbps to
Transmission Options or WAN Services There are a number of transmission options available today. They fall either into the analog or digital category. Next let’s take a brief
Circuit Switching – Dedicated physical circuit established, maintained, and terminated through a carrier network for each communication session – Datagram and data stream transmissions – Operates like a normal telephone call
So, what is a WAN? A WAN is a data communications network that serves users across a broad geographic area and often uses transmission facilities provided by common