How to create a frame relay switch

Here I am going to demonstrate how to configure cisco router as a frame relay switch. The configuration is very simple. So check the figure below carefully and understand the configuration.

Connect the routers as in the figure.Here I am creating two PVCs – first one between R1 & R2, and second one between  R1 & R3

WordPress installation error

error

Can’t select database

We were able to connect to the database server (which means your username and password is okay) but not able to select the wordpress database.

• Are you sure it exists?
• Does the user root have permission to use the wordpress database?
• On some systems the name of your database is prefixed with your username, so it would be like username_wordpress. Could that be the problem?

If you don't know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.

Routing vs. Routed Protocols

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Before talking about the routing and routed protocols, look at the screen shot from Google map. How many way to reach from point A to Point B?

Okay, you don’t need to count. There are plenty of ways. isn’t it? how will you select the right path from point A to Point B? We may consider different aspects for this - fast way, way with low transportation charge, etc.

Difference between Protocol number and Port number

Protocol number is the value contained in the “protocol” field of an IPv4 header. It is used to identify the protocol. This is an 8 bit filed. In IPv6 this field is called “Next header” field. Some of the protocol numbers of commonly used routing protocols are given below:

Protocol	Protocol Number
EIGRP	88
OSPF	89

Different types of communication systems

Simplex

In this type of communication, first device send data and second device receive it. Second device never send  any information to first device. Broadcast systems like FM radio work in this way.

Half Duplex

In this type of communication, when first device send data, second device receives it and when second devices send data, first device receives it. But both devices can’t send or receive data at the same time. This type of communication is using in "walkie-talkie".

Full Duplex

In this type of communication, first and second device can send and receive data simultaneously. Phones and mobile phones are using this type of communication.

Note: In Ethernet communication we can set both end half or full duplex depending up on the requirements. That is Ethernet can work on both mode.