A DoS attack can result in network downtime and loss of productivity, revenue loss, and information theft.

A DoS attack is an attack in which legitimate users are denied access to networks, systems, or resources. The potential risks posed by a DoS attack are as follows:

- Downtime and productivity loss: A DoS attack causes downtime in the network, which ultimately results in loss of productivity for the organization.
- Revenue loss: Organizations that use their Web sites for commerce or vital support services, such as search engines, can incur large revenue losses.
- Information theft: DoS attacks can also be aimed at stealing important and confidential information from a network.
- Malicious competition: An organization might launch DoS attacks against their competitors to damage their reputation.

A few methods that can help minimize potential risks from DoS attacks are:

- Using a firewall, which allows you to block or permit traffic entering into the network, can help to mitigate DoS attacks.
- Computers vulnerable to attacks can be shifted to another location or a more secure LAN.
- Intrusion Detection Systems (IDS), such as Network Intrusion Detection Systems (NIDS) and Host Intrusion Detection Systems (HIDS), can be implemented to detect intrusive network or host activity, such as a DoS attack, and raise alerts when any such activity is detected.

A DoS attack does not result in the spread of viruses because viruses are not spread by DoS attacks. Viruses are spread when the network is attacked by a virus or a Trojan horse.

A DoS attack does not result in the spread of spyware. DoS attacks are mainly aimed at exhausting system resources so that legitimate users are denied access to networks, systems, or resources. Spyware is software installed on a computer without the knowledge of the user, and it gathers information about a person or organization. Spyware is generally downloaded through Web sites and e-mail messages.

Objective:
Infrastructure Maintenance

Sub-Objective:
Configure, verify, and troubleshoot basic device hardening

References: https://www.cisco.com/c/en/us/td/docs/ios/sec_data_plane/configuration/guide/convert/sec_data_d os_atprvn_15_1_book/sec_cfg_tcp_intercpt.html#wp1000871

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