Page 56 - Computer Software Application TP - Volume 1
P. 56

COMPUTER SOFTWARE APPLICATION - CITS


           EXERCISE 15 : Handling Denial-of-Service (DoS)



            Objectives

           At the end of this exercise you shall be able to
           •  handle DoS during a attack
           •  prevent DoS during the attack.

           Requirements


           Tools/Materials
           •   PC/Laptop with network connectivity
           •   Firewall & VPN


           Procedure

           TASK 1: Handling DoS During a Attack
           1  Identify  the  Attack:  The  first  step  is  to  recognize  a  DoS  attack.  Signs  include  unusually  slow  network
              performance, website outages, or specific applications being unavailable.
           2  Isolate the Attack:  Try to isolate the affected system or service to minimize the impact on the entire network.
              Firewalls and traffic filtering rules can be helpful here.
           3  Activate DDoS Defense Mechanisms: Many network devices like routers have built-in DDoS protection
              features.  These may include rate limiting, which restricts incoming traffic volume, or blackholing malicious IP
              addresses.

           4  Contact Your Service Provider:  If you suspect a large-scale DDoS attack, especially for businesses or
              organizations,    your  internet  service  provider  (ISP)  can  offer  more  advanced  mitigation  techniques  and
              resources.

           5  Analyze and Adapt: Once the immediate attack subsides, analyze logs and traffic patterns to understand the
              attack type. This will help refine your mitigation strategies for future attacks.


           TASK 2: Preventing DoS Attacks
           1  Plan  and  Prepare:    Develop  a  DoS  incident  response  plan  that  outlines  roles,  responsibilities,  and
              communication protocols during an attack.
           2  Strengthen Network Security: Regularly update firewalls, intrusion detection/prevention systems (IDS/IPS),
              and software on all devices.

           3  Utilize DDoS Mitigation Services: Consider subscribing to DDoS protection services offered by security
              vendors. These services can filter malicious traffic before it reaches your network.

           4  Content Delivery Networks (CDNs):   CDNs can absorb large traffic spikes and distribute legitimate traffic
              more efficiently.

           5  Educate Users:  Train employees on potential social engineering tactics hackers use to launch DoS attacks
              via phishing emails or malware.

              NOTE:  DoS mitigation strategies depend on the specific attack type and the resources available.











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