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This strategy is a very simple method of weighing access to your servers, however, and its primary downfall is the same as any other simple round-robin technique: if a server fails, that server has to be accessed x number of times before the algorithm switches the connection to a new server A second problem with this technique is that time and session length are not taken into account Sure, maybe Server1 should be able to respond to four times as many connections as Server3, but what if they all exist at the same time Or what if they are all activated during a short time (like within milliseconds of each other) Weighted round-robin cannot take these factors into account, and, therefore, slow response times can still be a problem in certain situations It is simple to design and implement, however, and works well for applications with fairly static data access and connection establishment requirements Weighted least connections, on the other hand, is a more complicated, and consequently more robust, algorithm Weighted least connections examines current connections established to all of the servers in the pool and assigns new connections based on the current traffic load of the server, as well as the server's configured weight Although this process sounds complicated, the math behind the algorithm is really fairly simple; just add up the total of all of the weights, and each server gets its corresponding percentage of the total So, in the previous example, the weight of the servers was four for Server1, five for Server2, and one for Server3 Four plus five plus one equals ten, so Server1 (weight of four) gets 40 percent of the traffic, Server2 (weight of five) gets 50 percent of the traffic, and Server3 (weight of one) gets 10 percent of the traffic If you started with these three servers and no connections were established, the first connection to come in goes to the server that was farthest away from its configured total in this case, Server2 (50 percent away from the configured traffic total) The second connection then goes to Server1 because it is 40 percent away from its configured total, Server2 is at its configured total (two connections divided by one connection to Server2 equals 50 percent of all connections allocated to Server2), and Server3 is only 10 percent away from its configured total The third connection then goes to Server2 because Server1 is only 666 percent away from its configured total (Three connections divided by one connection to Server1 equals 3333 percent; 40 percent minus 33 percent equals 666 percent) Server3 is still only 10 percent away from its configured total, but Server2 is now 1666 percent away from its configured total (Three connections divided by one connection to Server2 equals 3333 percent; 50 percent minus 33 percent equals 1666 percent) On the next connection, Server1 receives the connection because it is now 15 percent away from its configured total (Four connections divided by one connection to Server1 equals 25 percent; 40 percent minus 25 percent equals 15 percent) Server2 is at its configured total (four connections divided by two connections to Server2 equals 50 percent; 50 percent minus 50 percent equals 0 percent), and Server3 is still only 10 percent away from its configured total Somewhere around the sixth connection, Server3 finally gets a connection, but you get the idea This algorithm deals very well with the issue of having several connections open at the same time, but it is still susceptible to the problem in which several connections are established in a short time It is also still susceptible to the problem in which a server dies, and packets are still forwarded to that server instead of other servers in the pool To deal with these problems, a few additional functions need to be employed.

A less frequently employed system for restricting access is mandatory access control This system, generally used only in environments in which different levels of security classifications exist, is much more restrictive regarding what a user is allowed to do Referring to the Orange Book, a mandatory access control is a means of restricting access to objects based on the sensitivity (as represented by a label) of the information contained in the objects and the formal authorization (ie, clearance) of subjects to access information of such sensitivity In this case, the owner or subject can t determine whether access is to be granted to another subject; it is the job of the operating system to decide In MAC, the security mechanism controls access to all objects, and individual subjects cannot change that access The key here is the label attached to every subject and object The label will identify the level of classification for that object and the level to which the subject is entitled Think of military security classifications such as Secret and Top Secret A file that has been identified as Top Secret (has a label indicating that it is Top Secret) may be viewed only by individuals with a Top Secret clearance It is up to the access control mechanism to ensure that an individual with only a Secret clearance never gains access to a file labeled as Top Secret Similarly, a user cleared for Top Secret access will not be allowed by the access control mechanism to change the classification of a file labeled as Top Secret to Secret or to send that Top Secret file to a user cleared only for Secret information The complexity of such a mechanism can be further understood when you consider today s windowing environment The access control mechanism will not allow a user to cut a portion of a Top Secret document and paste it into a window containing a document with only a Secret label It is this separation of differing levels of classified information that results in this sort of mechanism being referred to as multilevel security Finally, just because a subject has the appropriate level of clearance to view a document, that does not mean that she will be allowed to do so The concept of need to.

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