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set of all loans awarded by a particular bank The individual entities that constitute a set are said to be the extension of the entity set Thus, all the individual bank customers are the extension of the entity set customer Entity sets do not need to be disjoint For example, it is possible to de ne the entity set of all employees of a bank (employee) and the entity set of all customers of the bank (customer) A person entity may be an employee entity, a customer entity, both, or neither An entity is represented by a set of attributes Attributes are descriptive properties possessed by each member of an entity set The designation of an attribute for an entity set expresses that the database stores similar information concerning each entity in the entity set; however, each entity may have its own value for each attribute Possible attributes of the customer entity set are customer-id, customer-name, customerstreet, and customer-city In real life, there would be further attributes, such as street number, apartment number, state, postal code, and country, but we omit them to keep our examples simple Possible attributes of the loan entity set are loan-number and amount Each entity has a value for each of its attributes For instance, a particular customer entity may have the value 321-12-3123 for customer-id, the value Jones for customername, the value Main for customer-street, and the value Harrison for customer-city The customer-id attribute is used to uniquely identify customers, since there may be more than one customer with the same name, street, and city In the United States, many enterprises nd it convenient to use the social-security number of a person1 as an attribute whose value uniquely identi es the person In general the enterprise would have to create and assign a unique identi er for each customer For each attribute, there is a set of permitted values, called the domain, or value set, of that attribute The domain of attribute customer-name might be the set of all text strings of a certain length Similarly, the domain of attribute loan-number might be the set of all strings of the form L-n where n is a positive integer A database thus includes a collection of entity sets, each of which contains any number of entities of the same type Figure 21 shows part of a bank database that consists of two entity sets: customer and loan Formally, an attribute of an entity set is a function that maps from the entity set into a domain Since an entity set may have several attributes, each entity can be described by a set of (attribute, data value) pairs, one pair for each attribute of the entity set For example, a particular customer entity may be described by the set {(customer-id, 67789-9011), (customer-name, Hayes), (customer-street, Main), (customer-city, Harrison)}, meaning that the entity describes a person named Hayes whose customer identi er is 677-89-9011 and who resides at Main Street in Harrison We can see, at this point, an integration of the abstract schema with the actual enterprise being modeled The attribute values describing an entity will constitute a signi cant portion of the data stored in the database An attribute, as used in the E-R model, can be characterized by the following attribute types.

information for an additional connection that should be established This can create problems with address translation devices, where they are only performing address translation at the network and transport layer, not at the session/application layer The addressing or port information requested might conflict with what is already in the address translation table Look at Figure 10-2, which illustrates this problem On the control connection, UserB notifies the data server to connect to port 38995 for the data connection; however, port 38995 is already used by another user (UserA) in the translation table You have two solutions to this problem: Assuming you could control what source port number the user was going to send to the server, you could define different ports for different users, and then set up a static PAT translation for each user Obviously this isn t scalable, and on top of this issue, the application might not let you specify the port number the user sends to the server A better solution would have the translation device examine the application payloads of control connections to find any embedded addressing information and perform address translation on the layer 3 and layer 4 headers as well as the embedded addresses in the application-layer payloads Again, Cisco security appliances can deal with many applications that embed addressing information in the application-layer payload and can perform address translation on this embedded information NOTE Cisco doesn t support application-layer inspection for all applications only the ones more commonly used by a company network However, the list is quite extensive The remaining chapters in Part III will cover many of the applications that the appliances support for the application inspection process

1 In the United States, the government assigns to each person in the country a unique number, called a social-security number, to identify that person uniquely Each person is supposed to have only one socialsecurity number, and no two people are supposed to have the same social-security number

Now that you understand some of the policies that MPF can implement and why MPF is needed, let s discuss the components that comprise MPF Implementing MPF has three components: Class maps Classify and/or identify traffic that you want to associate one or more policies to Policy maps Associate one or more policies to a class of traffic in your class maps Service policies Activate the policies in your policy maps either on a specific interface or on all interfaces of the appliance

To ensure high availability, Oracle provides a managed standby database feature (This feature is the same as remote backups, described in Section 1710) A standby database is a copy of the regular database that is installed on a separate system If a catastrophic failure occurs on the primary system, the standby system is activated and takes over, thereby minimizing the effect of the failure on availability Oracle keeps the standby database up to date by constantly applying archived redo logs that are shipped from the primary database The backup database can be brought online in read-only mode and used for reporting and decision support queries

To help understand the MPF components and how they interact with each other, examine Figure 10-3 In this example, four policies were implemented First, all Internet traffic entering the outside interface of the appliance will have the IPS card process it and, assuming the IPS card doesn t drop it, the traffic comes back out of the card, and the appliance performs application-layer inspection on it for valid connections; these will be added to the state table Second, the Sales IPSec remote access (RA) users will have rate-limiting (policing) applied to their traffic on the outside interface Third, voice traffic will be prioritized and forwarded out the inside interface before other types of traffic Fourth, normal data traffic will be inspected on all interfaces and added to the state table as necessary