Download Cisco CCNA : training kit : user manual : [complete guide to by Cisco Systems PDF

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With NAC, network access to compliant and trusted PCs can be permitted, while the access of noncompliant devices can be restricted. See Figure 1-2. Figure 1-2 ACS Extended to NAC ACS is also an important component of the Cisco Identity-Based Networking Services (IBNS) architecture. 1x (a standard for port-based network-access control) to extend security authentication, authorization, and accounting from the perimeter of the network to every connection point inside the LAN. New policy controls such as per-user quotas, virtual LAN (VLAN) assignments, and access-control lists (ACLs) can be deployed, due to the extended capabilities of Cisco switches and wireless access points to query ACS over the RADIUS protocol.

The ACS Login page encrypts the administrator credentials before sending them to ACS. Administrative sessions time out after a configurable length of idle time. Regardless, we recommend that you log out of the web interface after each session. For information about configuring the idle timeout feature, see Access Policy, page 12-8. User Guide for Cisco Secure Access Control Server for Windows 78-16992-02 1-15 Chapter 1 Overview Managing and Administrating ACS You can enable a secure socket layer (SSL) for administrative sessions.

This feature introduces granular application of network-access restrictions and downloadable ACLs, which previously supported only the use of the same access restrictions or ACLs to all devices. You can use NAFs to define flexible network device restriction policies to be defined, a requirement that is common in large environments. Authentication Authentication determines user identity and verifies the information. Traditional authentication uses a name and a fixed password. More secure methods use technologies such as Challenge Authentication Handshake Protocol (CHAP) and One-time Passwords (OTPs).

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