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a. 1. 1. Physical sabotage 1. 2. 2. Overwriting MAC-to-IP address mappings 2. 3. 3. Rerouting cables 3. 4. 4. Packet sniffing 4. 5. 5. EMI and RFI 5. a. Routers a. b. b. Switches and bridges b. c. c. Hubs c. d. d. Hosts on the network d. e. e. Wireless AP e. f. f. f. ARP cache
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Lesson Review The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the question again. Answers to the questions can be found in Appendix A, "Questions and Answers." 1. 1. List security issues that are common to managed hubs, switches, and routers. 1. 2. 2. Describe security issues that are common to switches and routers. 2. 3. 3. How might an attacker compromise a firewall implementation 3. 4. 4. List ways in which a PBX can be compromised. 4. 5.
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5. What are the security implementations available for wireless networks 5. Lesson Summary Physically secure as much of your network infrastructure as possible. This includes locking central connectivity devices in rooms or protective enclosures.
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Managed devices on your network infrastructure can be vulnerable to password guessing attacks. Any device that can be managed locally and especially remotely should be configured with the most secure authentication and encryption available.
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Monitor software and hardware vendor Web sites and bulletins for information on security exploits. You should apply all available security fixes as soon as possible.
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Configure managed devices such as hubs, switches, routers, PBX systems, and firewalls to alert you of unauthorized connections.
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Configure the most secure authentication and encryption on all wireless devices.
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Ensure that your firewall virus definition files are routinely updated.
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Document your network infrastructure, including the configuration of all connectivity devices, computers with modems, PBX system configuration, and all network cable attachments.
Routinely audit your network infrastructure to ensure there are no unauthorized connections, configurations, or devices.
Lesson 4: Exploring Secure Topologies This lesson focuses on network designs that enhance security. Many networks today are in some way connected to the Internet. The presence of malicious software and hackers makes the Internet a potentially dangerous network. Organizations that provide their internal users and clients with Internet access expose their networks to potential attacks. Organizations that provide services to Internet users also open their resources to attack. Organizations providing connections or services to the Internet must realize the need for protective equipment, software, and secure topologies.
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After this lesson, you will be able to
List different types of security zones
Explain the purpose of a perimeter network
Describe the function of network address translation (NAT)
Identify uses for virtual private networks (VPNs)
Explain the use of virtual local area networks (VLANs)
Estimated lesson time: 20 minutes
Security Zones Organizations often create security zones by placing firewalls between internal and external networks. Multiple firewalls are often used to create multiple layers of protection between the internal and external networks, as previously discussed. Some network designs place a network segment between two firewalls. This network segment between the firewalls is called a perimeter network (also known as a DMZ, demilitarized zone, or screened subnet). The creation of a perimeter network creates a division of the network infrastructure into three separate subordinate network structures called security zones. Security zones help organizations classify, prioritize, and focus on security issues based on the services that are required in each zone. These security zones are as follows: Intranet. The organization's private network; this is used by employees and those internal to the organization (such as contractors and on-site partners). Perimeter network. Used to provide services to users on the Internet and sometimes those inside the organization. Extranet.
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Depending on the security devices used and the network layout, the external network might be called a wide area network (WAN), Internet, public network, or untrusted network. For example, some three-pronged firewalls label the external network connection as a WAN, and others as the Internet.
The following three sections of this lesson discuss intranet, perimeter network, and external security zones in greater detail. Intranet The security zone closest to the company is called the intranet. This is also known as the internal network, private network, local area network (LAN), trusted network, protected network, and company or organizational network. The intranet is typically the network (or networks) that contains most of the organization's private resources, including computers, users, data, printers, and other network infrastructure equipment.
Organizations typically don't expect malicious attacks from their own intranets. This is why this security zone is often considered the trusted network. However, former and current employees and contractors might attack resources on the intranet. Intranet users could wittingly or unwittingly install viruses, and they could also try to access or spy on confidential resources. Additionally, internal users probably have access to some part of or possibly the entire physical network. Physical access could enable users to unplug equipment, destroy equipment, or attach unauthorized devices to the network. Security for the intranet security zone typically includes the following measures: Firewall protection from the external network and the perimeter network
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