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cisco certification classes near me.Figure 2-10 North-South Traffic within a Data Center Network 5. virtual firewalls Firewalls can also take on the face of a virtual machine (VM). CiscoASAv is one such virtual firewall. This virtual firewall is typically deployed in the data center network to isolate and protect the virtual network environment. The reason for deploying such a firewall is that traffic between VMs typically flows "inside" the physical server, and a physical firewall can neither detect the traffic nor enforce policies.Data Center NetworksTip: Cisco ASAs also have a feature called virtual context. This is different from the virtual firewall mentioned earlier. The CiscoASA security context feature refers to "virtualizing" a physical device into multiple individual contexts (or multiple virtual firewalls). o A virtual firewall such as CiscoASAv runs on VMware or KVM within a physical server (for example, CiscoUCS).2.2 Network Security Systems 125 However, Intrusion Prevention System (IPS) devices not only detect all of the above security threats, but can also inlinePhysical ServerFigure 2-11 Example of a virtual firewall6. Deep Packet InspectionWhen dealing with traffic passing through the local machine, the firewall needs to give "special treatment" to packets generated by certain applications. Such applications or protocols either embed IP address information in the net load of the packet or create a new data transport channel from a dynamically assigned port. New firewalls and security appliances (e.g., CiscoASA and Cisco IOS Firewall) have various application detection mechanisms that are sufficient to allow the previously mentioned applications or protocols to function properly. Security appliances with application detection can identify the ports dynamically assigned to various applications or protocols and allow traffic generated by the relevant application or protocol to pass through those ports for a specified connection period.A firewall with deep packet inspection detects the Layer 7 net load of a specific packet and can effectively protect against security threats. For example, a Cisco ASA running software version 7.0 or higher can be configured to drop traffic from peer-to-peer (P2P) applications delivered over the HTTP protocol. Such a security device can also be configured to block traffic containing specified FTP commands and HTTP content types, as well as certain specified application layer protocol traffic.Tip: CiscoASA supports the Modular Policy Framework (MPF). By MPF, we mean that application detection and other features can be enabled for specified traffic in a consistent and flexible manner, in a configuration style similar to the modular Quality of Service (QoS) command-line interface supported by CiscoIOS software.