Chapter 15 Firewall Mode Overview

Transparent Mode Overview

An Inside User Visits a Web Server

Figure 15-8shows an inside user accessing an outside web server.

Figure 15-8 Inside to Outside

www.example.com

Internet

209.165.201.2

Management IP

209.165.201.6

Host

209.165.201.3

92408

The following steps describe how data moves through the security appliance (see Figure 15-8):

1.The user on the inside network requests a web page from www.example.com.

2.The security appliance receives the packet and adds the source MAC address to the MAC address table, if required. Because it is a new session, it verifies that the packet is allowed according to the terms of the security policy (access lists, filters, AAA).

For multiple context mode, the security appliance first classifies the packet according to a unique interface.

3.The security appliance records that a session is established.

4.If the destination MAC address is in its table, the security appliance forwards the packet out of the outside interface. The destination MAC address is that of the upstream router, 209.186.201.2.

If the destination MAC address is not in the security appliance table, the security appliance attempts to discover the MAC address by sending an ARP request and a ping. The first packet is dropped.

5.The web server responds to the request; because the session is already established, the packet bypasses the many lookups associated with a new connection.

6.The security appliance forwards the packet to the inside user.

 

Cisco Security Appliance Command Line Configuration Guide

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OL-12172-01

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Cisco Systems OL-12172-01 manual 8shows an inside user accessing an outside web server, 15-12
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OL-12172-01 specifications

Cisco Systems OL-12172-01 is a pivotal component in the landscape of networking and telecommunications, particularly catering to the needs of businesses seeking robust and efficient networking solutions. This particular offering is part of Cisco's ongoing commitment to providing advanced networking technologies that enhance connectivity, security, and overall operational efficiency.

One of the main features of Cisco OL-12172-01 is its capability to support enterprise networking environments through highly scalable and flexible architecture. The device is designed to address the growing demands for bandwidth and connectivity in corporate networks, enabling seamless communication and data exchange among various devices and applications. With support for high-speed Ethernet connections, the OL-12172-01 can significantly improve the performance of network operations, ensuring minimal downtime and optimal user experiences.

Security is a hallmark of the Cisco OL-12172-01. The device comes equipped with advanced security protocols that protect sensitive data and mitigate the risks associated with network vulnerabilities. Features such as integrated firewall capabilities, Virtual Private Network (VPN) support, and intrusion prevention systems are vital in safeguarding corporate information against cyber threats. This ensures that businesses can operate confidently in a digital landscape laden with potential risks.

Another significant aspect of the OL-12172-01 is its compatibility with various Cisco technologies, enhancing its versatility. It integrates seamlessly with Cisco’s Software-Defined Networking (SDN) solutions, allowing for dynamic network management and automation. This adaptability means businesses can respond quickly to changing network demands and efficiently manage resources without incurring excessive costs.

The OL-12172-01 also boasts comprehensive management and monitoring tools. Through Cisco's management software, network administrators can easily configure, monitor, and troubleshoot their networks. These tools provide insight into network performance metrics, enabling proactive measures to ensure optimal functionality.

In summary, Cisco Systems OL-12172-01 is a feature-rich device designed for modern enterprise networking. With advanced security measures, high-speed connectivity, and compatibility with cutting-edge technologies, it empowers businesses to optimize their network infrastructure while maintaining high levels of protection. As organizations continue to evolve their IT landscapes, the OL-12172-01 remains a reliable solution for enhancing operational efficiency and safeguarding essential data.
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