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So this is once again an example of an external Sea issue issue connected using a v 35 cable to a router.

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Here's an example with the weak card having the C as you d issue built in.

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So what's the bolting C issue D issue such as a weak one D issue t 1 the card would be used to connect

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it to either T1 or fractional T1 connections.

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The advantage of using this card over an external C issue D issue is that you have fewer devices and

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cables to deploy and manage.

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It also allows you to remotely configure monitor and troubleshoot using the well-known Cisco C ally

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and it obviously saves some space because you have fewer devices.

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So in many cases in the United States people would use the Bolton C issue D issue but in other parts

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of the world you may still be required to use an external C issue issue.

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So what are some of the advantages of a leased line.

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Well firstly it's very simple to configure you can get a lease line up and running with just a few commands

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so it's very simple to install and maintain point to point lease lines.

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Also offer a high quality of service provided that there's adequate bandwidth for the traffic traversing

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the link.

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In other words the bandwidth of the connection is dedicated to you and you alone.

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No one else will be able to use the bandwidth on that circuit.

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You are typically paying a monthly charge for the leased line and the bandwidth on that leased line

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is dedicated to you alone.

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The connection is also permanent so you don't have to try and set it up every time you send traffic.

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The bandwidth is there and they're always for you to use the major disadvantage of the leased lines

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however is normally the cost of the lease line.

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Now if you've only got two sites the cost may not be that great.

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However if you've got 10 sites that you need to connect in a full mesh.

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In other words every site needs to be connected to every other site.

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The cost can become very prohibitive as there's an exponential increase in the cost as you add more

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and more sites.

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That's one of the reasons that small medium businesses today prefer to use DSL connections with a VPN

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rather than using leased lines and large businesses.

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When making connections to remote branch offices may also prefer to use the Internet with DSL as the

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local connection type with VPN is overlaid across the Internet.

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It's a lot a lot cheaper especially when you have many many sites.

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Another problem is you are charged for the bandwidth whether you use it or not.

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So as an example if you've got a 2 megabits per second circuit or two megabits per second leased line

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you are charged a monthly fee for that leased line whether you use the bandwidth or not.

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If you're only using some of the bandwidth some of the time you are paying for bandwidth that you don't

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use.

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So that's another disadvantage of a lease line.

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You also have no ability to burst or go above the fixed limit of 2 megabits per second.

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You are limited to the speed of the link.

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The bandwidth is yours to use all the time but you can't go above the speed of the leased line.