Cisco Certified Network Associate (CCNA) Practice Exam

In which situation would you configure a remote access ACL?

1. To control web traffic

2. To permit or deny access through a VTY line

3. To manage traffic flow between routers

4. To secure network protocols

The correct answer is: To permit or deny access through a VTY line

Configuring a remote access ACL (Access Control List) is essential for managing access through virtual terminal (VTY) lines, which facilitate remote management of network devices. When network administrators access devices remotely via protocols such as SSH or Telnet, an ACL can be implemented to specify which IP addresses are allowed or denied access to those devices. Using a remote access ACL ensures that only authorized devices or users can connect to the network equipment, enhancing the security of the network by mitigating unauthorized access. It allows organizations to maintain strict control over who can log in and manage their network devices remotely. This level of control is crucial in preventing potential security breaches that could occur if an attacker were to gain access to administrative functions. In contrast, controlling web traffic is typically managed by other types of ACLs that focus on Layer 3 (network layer) and Layer 4 (transport layer) filtering, not specifically tied to remote access. Managing traffic flow between routers often involves routing protocols and policies rather than remote access configurations. Similarly, securing network protocols involves protecting the data as it travels across the network, which may involve encryption and not the direct access control associated with VTY lines.