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In the preceding example, a regular expression class map includes two regular expressions: abc1com and abc2com I ll assume that these are my company domain names Following this is a layer 7 class map (L7_HTTP_class) for HTTP that is looking for all of the following: In either a request or a response, a content type mismatch in a request or a response message (like a tag that says <IMG> but the file referenced doesn t end in an extension associated with a picture/image) A request body length is greater than 1,000 bytes A URI part of the request doesn t contain the two regular expressions

The result of an SQL query is, of course, a relation Let us consider a simple query using our banking example, Find the names of all branches in the loan relation : select branch-name from loan The result is a relation consisting of a single attribute with the heading branch-name Formal query languages are based on the mathematical notion of a relation being a set Thus, duplicate tuples never appear in relations In practice, duplicate elimination is time-consuming Therefore, SQL (like most other commercial query languages) allows duplicates in relations as well as in the results of SQL expressions Thus, the preceding query will list each branch-name once for every tuple in which it appears in the loan relation In those cases where we want to force the elimination of duplicates, we insert the keyword distinct after select We can rewrite the preceding query as select distinct branch-name from loan if we want duplicates removed SQL allows us to use the keyword all to specify explicitly that duplicates are not removed: select all branch-name from loan Since duplicate retention is the default, we will not use all in our examples To ensure the elimination of duplicates in the results of our example queries, we will use distinct whenever it is necessary In most queries where distinct is not used, the exact number of duplicate copies of each tuple present in the query result is not important However, the number is important in certain applications; we return to this issue in Section 428 The asterisk symbol * can be used to denote all attributes Thus, the use of loan* in the preceding select clause would indicate that all attributes of loan are to be selected A select clause of the form select * indicates that all attributes of all relations appearing in the from clause are selected The select clause may also contain arithmetic expressions involving the operators +, , , and / operating on constants or attributes of tuples For example, the query select loan-number, branch-name, amount * 100 from loan.

Below the layer 7 class map, a layer 7 policy map (L7_HTTP_policy) is configured for HTTP A global policy is defined for content type mismatches (match req-resp content-type mismatch): reset and log the connection For information matching in the layer-7 class map, the connections are dropped and logged Protocol violations are logged, but allowed Likewise, I m spoofing the server information in response messages, replacing the server information with a list of asterisks A layer 3/4 class map (L3_HTTP_TRAFFIC) is created that includes port 80 traffic A layer 3/4 policy map (L3_outside_policy) is created that references the layer 3/4 class map and performs application layer inspection of HTTP traffic, qualifying the inspection by using the layer-7 policy map policies

The McGraw Hill Companies, 2001

Users can take advantage of the multifunction capabilities of instant messaging (IM) applications: chatting, video, voice, games, file transfers, and others Many or all of these can create productivity problems and security issues in the workplace Inspection of IM became available in version 7, allowing you to control these functions Inspection features currently support Yahoo Messenger and MSN Messenger IM clients on their native ports With these IM clients, you can control what usernames the users use to log in, the user and server addresses allowed to communicate with each other, the services the clients can use within the IM client, and many other things The following sections will discuss how to configure an IM inspection policy

will return a relation that is the same as the loan relation, except that the attribute amount is multiplied by 100 SQL also provides special data types, such as various forms of the date type, and allows several arithmetic functions to operate on these types