Which of the following are security features commonly available on Cisco devices? (Select all that apply.)
Correct Answer: A,B,C,D
Detailed Explanation: Cisco devices incorporate a wide range of security features designed to protect network infrastructure, control access, and manage traffic effectively. Let’s examine the options provided: A. SSH for Secure Remote Access: Secure Shell (SSH) is widely used for secure remote management of Cisco devices. Unlike Telnet, which sends data (including passwords) in plaintext, SSH encrypts all traffic, ensuring that sensitive information remains confidential during remote access sessions. This makes SSH a critical tool for network administrators when managing devices over insecure networks such as the Internet. B. AAA (Authentication, Authorization, and Accounting): AAA is a framework that centralizes the processes of authenticating users, authorizing their actions, and accounting for their activity on the network. Cisco devices support AAA through integration with protocols like RADIUS and TACACS+, allowing for granular control over user access and detailed logging of network activity. This centralized approach improves security by ensuring that only authorized users can access network resources and by providing an audit trail for compliance and troubleshooting. C. Port Security: As discussed earlier, port security is a feature available on Cisco switches that restricts access based on MAC addresses. By limiting the number of permitted MAC addresses on a port and taking action (such as shutting down the port) if a violation occurs, port security helps prevent unauthorized devices from connecting to the network. This feature is especially important in environments where physical security may be compromised or in public access scenarios. D. NAT for IP Address Translation: Network Address Translation (NAT) is used to map private IP addresses to public IP addresses, which not only conserves public address space but also adds a layer of security. By masking internal IP addresses, NAT makes it more difficult for external attackers to identify and target individual hosts within a private network. Although NAT itself is not an encryption method, its ability to hide internal network details contributes to overall security. E. SNMPv1 for Secure Network Monitoring: While Simple Network Management Protocol (SNMP) is commonly used for network monitoring and management, SNMPv1 is not considered secure. SNMPv1 transmits data in clear text and lacks robust authentication mechanisms. More secure versions such as SNMPv3 should be used when security is a concern. Therefore, SNMPv1 is not regarded as a secure network monitoring protocol, making option E incorrect. Importance in Network Design: These security features—SSH, AAA, port security, and NAT—form the backbone of secure network operations. They address various aspects of network security: secure remote access, user management, physical port-level security, and network address obscuration. Network administrators must be familiar with configuring and troubleshooting these features to maintain a secure network environment. For CCNA exam candidates, a solid understanding of these security mechanisms is essential. You may be asked to compare different protocols (e.g., Telnet vs. SSH) or to design a security policy that incorporates multiple layers of protection. Being well-versed in these topics will not only help you on the exam but also in real-world network administration. In summary, SSH, AAA, port security, and NAT are common security features on Cisco devices, while SNMPv1 is not considered secure for network monitoring.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.