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Additional resources for Cisco Security Intrusion Detection Systems (CSIDS) Student Guide V4.1

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For example, if an entire organization deploys switched Ethernet, hackers can gain access only to the traffic that flows on the specific port to which they connect. A switched infrastructure obviously does not eliminate the threat of packet sniffers, but it can greatly reduce their effectiveness. Antisniffer tools—Software and hardware designed to detect the use of sniffers on a network can be employed. Such software and hardware does not completely eliminate the threat, but like many network security tools, they are part of the overall system.

Set up access control on the device you wish to manage via SNMP to allow access by only the appropriate management hosts. Use SNMP Version 3 or above. When possible, the following practices are advised: Encrypt Syslog traffic within an IPSec tunnel. When allowing Syslog access from devices on the outside of a firewall, you should implement RFC 2827 filtering at the perimeter router. ACLs should also be implemented on the firewall in order to allow Syslog data from only the managed devices themselves to reach the management hosts.

All rights reserved. 1—2-33 Port redirection attacks are a type of trust exploitation attack that uses a compromised host to pass traffic through a firewall that would otherwise be dropped. Consider a firewall with three interfaces and a host on each interface. The host on the outside can reach the host on the public services segment (commonly referred to as a Demilitarized Zone [DMZ]), but not the host on the inside. The host on the public services segment can reach the host on both the outside and the inside.

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Cisco Security Intrusion Detection Systems (CSIDS) Student Guide V4.1

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