Security+ Exam Cram 2 (Exam SYO-101)

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Everything you need to know about studying for the SY0-501 Security+ Exam

Two access control methods share the same acronym, RBAC. The basis of this type of access is to determine what can happen to an object based on a set of rules.

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The most common use of this is on routers and firewalls. Access is determined by looking at a request to see whether it matches a predefined set of conditions. An example would be if you configured your router to deny any IP addresses from the When a machine with an address of In Rule-Based Access Control, the administrator sets the rules. This is considered a type of mandatory control because the users cannot change these rules.

In other words, if the administrator sets the aforementioned router conditions, you, as a user, cannot have the router accept requests from a Role-Based Access Control is based on a predefined set of rules that determines the object's access. These rights may vary by account, by group membership, by time of day, or by many other forms of conditional testing.

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An example of this would be setting the filtering of IP packets on a proxy server or firewall. Say you want to keep the production staff from downloading BMP files, but you want to allow the development staff to do so.

Before you allow any file to be downloaded, you check conditions such as the file type and the group membership. Remember that the most common form of Rule-Based Access Control involves testing against an ACL that details systems and accounts with access rights and the limits of their access for the resources. This method of access is based on an organization's structure and the roles the users play in the organization.

In this type of access control, it is determined what job functions each employee performs and then access is assigned based on those functions.

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Because users are assigned roles and then permissions are assigned to these roles, this may sound similar to a group membership. However, this is not necessarily so. Roles and groups both provide ways of controlling user access, but in a group environment, users can belong to other groups. In a role-based model, users can only be assigned one role. Another difference is that sometimes in a group environment, users are assigned separate or individual permissions.

A role-based model does not support this. Therefore, if you are assigned to the role of "developer," you have access to the resources that are allowed for that rolenothing more, and nothing less. Many times, this type of access control model will be used in companies that use a lot of independent contractors or have a high turnover. This saves on administrative overhead because the administrator can more easily remove and add users to a role. For example, let's look at the difference between a user in a group scenario and a user in a role scenario.

Your company had a developer who belonged to the following groups: development, testing, and production. He also had administrative permissions on two of the servers in the development office.

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He has left the company, and a new developer has been hired to replace him. Because you don't want the new developer to have the excessive permissions the original developer had, you cannot just rename the old account. This creates a lot of work for you as the administrator, and if turnover is high in your company, before you know it, you will have very little control or will be spending all your time setting permissions.

If the preceding situation is designed as a role-based scenario, the permissions are much cleaner because the developer can only be assigned one role. Therefore, when a new developer is hired, he either has the same role as the previous developer or is assigned a different one, but he can only have one role, making administration much easier.

The Role-Based Access Control model can use task-based access, lattice-based access, and role-based access. Task-based access is similar to role-based access, except tasks instead of roles are defined. Lattice-based access defines the upper and lower bounds of a user's permissions. This is found in MAC situations.


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I will be taking my test in March of I need all the tips and tricks from the veterans of this certification. Any insight is helpful! LarryDaMan Posts: Member.

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