Cisco router firewall security by Richard Deal

By Richard Deal

This ebook is a part of the Networking know-how sequence from Cisco Press, which bargains networking pros necessary details for developing effective networks, figuring out new applied sciences, and construction profitable careers.

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However, for sensitive information, encryption should be used to protect it. Obviously, certain network administrators should be allowed to perform eavesdropping in certain situations, such as troubleshooting connectivity issues. Any other type of eavesdropping by anybody else (other employees), however, should not be tolerated and should be dealt with immediately. Another solution is to employ a switched infrastructure, giving every device its own switch port connection. Using this design, even if a hacker has compromised one of the PCs in your network and loads a packet-sniffing tool onto the PC, the hacker will be able to see only traffic directed at the compromised PC or multicast or broadcast traffic.

Day Day Up > < Day Day Up > Security Solutions It is beyond the scope of this book to cover every type of security solution that is available on the market. This section covers some basic solutions that you should be aware of, as well as a security checklist to help strengthen your company's network security. The rest of this book focuses on the Cisco IOS routers for firewalls in implementing security in your network. Designing a Security Solution As you have seen throughout this chapter, a hacker can cause damage to your network in many ways (and this chapter barely skims the surface on the different kinds of attacks that your network will face).

In a session attack, a hacker attacks a session layer connection, hoping either to use this information to mount another attack, or, through subterfuge, to take over the session in which he pretends to be either the source or the destination device. Four general categories of session attacks exist: • Masquerading • Session replay • Session hijacking • Repudiation The following sections cover these session attacks in more depth. Masquerading Attack Masquerading is an attack method that a hacker uses to hide his identity.

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