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CISA · Question #288

The use of access control lists (ACLs) is the MOST effective method to mitigate security risk for routers because they:

The correct answer is A. act as filters between the world and the network. Access control lists (ACLs) are most effective for mitigating security risks on routers because they act as filters, controlling which traffic is allowed or denied based on predefined rules. This helps protect the internal network by blocking unauthorized or malicious traffic…

Submitted by kavita_s· Apr 18, 2026Protection of Information Assets

Question

The use of access control lists (ACLs) is the MOST effective method to mitigate security risk for routers because they:

Options

  • Aact as filters between the world and the network
  • Bcan detect cyberattacks
  • Care recommended by security standards
  • Dcan limit Telnet and traffic from the open Internet

How the community answered

(40 responses)
  • A
    90% (36)
  • B
    3% (1)
  • C
    5% (2)
  • D
    3% (1)

Explanation

Access control lists (ACLs) are most effective for mitigating security risks on routers because they act as filters, controlling which traffic is allowed or denied based on predefined rules. This helps protect the internal network by blocking unauthorized or malicious traffic from the outside world while allowing legitimate traffic to pass.

Topics

#Access Control Lists#Network Security#Routers#Security Controls

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