A criminal organization is planning an attack on a government network. Which of the following scenarios presents the HIGHEST risk to the organization?

A flood attack (DDoS) disrupts availability but does not grant the attacker control over devices or access to sensitive data, making it a temporary and limited-impact threat compared to full device compromise.

If an attacker gains control of network devices such as routers, switches, and firewalls, they effectively own the entire network infrastructure - they can redirect traffic, disable security policies, create backdoors, intercept all data, and facilitate any subsequent attack at will. This represents a total loss of confidentiality, integrity, and availability simultaneously. No other attack scenario provides the attacker with this level of persistent, broad, and catastrophic impact on the organization.

Disrupting network management communications (e.g., blocking SNMP or out-of-band management) impairs the organization's ability to administer the network but does not itself grant the attacker control or access to sensitive data.

Accessing network topology information is a reconnaissance-level threat that aids future attacks but does not by itself cause direct operational harm or grant control over any network resources.