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By combining an endpoint transport and payload, SQL Server can filter acceptable traffic before a command even reaches the SQL Server instance. For example, suppose that you have an endpoint defined as TCP with a payload of TSQL. If any application were to attempt to send HTTP, SERVICE_BROKER, or DATABASE_MIRRORING traf fic through the endpoint, the connection would be denied without needing to authen ticate the request.

WHERE soh.TerritoryID = 1 GROUP BY soh.CustomerID;

This process is similar to the way firewalls work on a network. Network administra tors configure firewalls to allow traffic on only a specific set of TCP and UDP ports. Any request attempting to use a port that is blocked is rejected at the firewall. End points act in the same manner by rejecting requests that are not properly formatted based on the endpoint definition.

Even if traffic going to the endpoint matches the correct transport and payload, a con nection is still not allowed unless access has been granted on the endpoint. Endpoint access has two layers. The first layer of access security is determined by the endpoint state. An endpoint can have one of three states: STARTED, STOPPED, and DISABLED. The three states of an endpoint react as follows:

What was the total cost of the query What was the total number of page reads for the query 8. Type and execute the following SQL statement to clean up after this exercise:

1. Use the Keep The Publisher Change conflict resolution policy. 2. Use a FOREIGN KEY constraint. 3. Use a CHECK constraint.

The second layer of security is permission to connect to the endpoint. An application must have a login created in SQL Server that has the CONNECT permission granted on the endpoint before the connection is allowed through the endpoint. You might be wondering about all the effort involved just to create a connection to an instance of SQL Server before the user is even authenticated. In prior versions of SQL Server, any application could connect to a SQL Server server and transmit any type of request. No attempt was made to ensure that applications had to trans mit validly formed requests, so hacking into a server was much easier to accom plish. SQL Server 2005 ensures that only valid requests can be submitted by a valid user before a request is scheduled within the engine. Administrators also have a master switch to immediately shut off access if they feel someone is attempting to compromise their SQL Server server, by setting the state of the endpoint being used to DISABLED.

5

USE master; DROP DATABASE TestDB;

1. What are the two parts of an endpoint 2. What are the three states of an endpoint and what is the difference between each state 3. What authority must be granted before an endpoint allows a connection request

1. The tinyint data type is most suitable. IPv4 decimal quads can only have a value of 0 to 255. 2. The char or nchar data type would be the most suitable. You would limit the length of either type to 12 characters. 3. You would use the XML data type.

Exercise 3: Optimize the Query by Using Covered Non-Clustered Indexes In this exercise, you will optimize the query by creating covered non-clustered indexes. 1. Open SQL Server Management Studio and connect to an instance of SQL Server 2005. In a new query window, type and execute the following SQL statements to create the TestDB database, the Test schema, and the two tables that will be used in this exercise:

1. An endpoint has a transport defined as either TCP or HTTP, and has a pay load defined as TSQL, SERVICE_BROKER, DATABASE_MIRRORING, or SOAP. 2. The three states are STARTED, STOPPED, and DISABLED. An endpoint that is STARTED listens for and allows connections. An endpoint that is STOPPED listens for connection requests and returns an error message. An endpoint that is DISABLED does not respond to any request. 3. To allow a connection request, the login that is being used must have been granted the CONNECT permission on the endpoint.

In this exercise, you query several dynamic management views (DMVs) to gather information about endpoints configured in your environment. 1. Launch Microsoft SQL Server Management Studio (SSMS), and connect to your instance. Open a new query window, and execute the following batch: