Distributed Denial of service
Distributed Denial of service (DDoS) is the means for which a perpetrator attempts to make a server or network resource unavailable to its intended users. This can also be considered as a cyber-attack against an organisation. Attempted attacks aim to overwhelm web services by using distributed sources to request more connections than your web servers can handle, this is called a volumetric attack. Such an attack will render your online services as offline as a genuine user would not be able to gain a connection whilst an attack is in progress. These attacks are usually malicious with the aim to cause a financial loss to an organisation, to damage its reputation, or to prevent a service being provided to the public. All organisations with an online service without a DDoS mitigation are at risk of such attacks. Highly available network architecture can still fail without sufficient protection.