What security features are configured for VTY access? (Choose three.)
- Telnet access is enabled
- AAA authentication
- Encryption of management traffic
- SSH-only access
- ACL filtering for incoming connections
Explanation: According to the sources, securing VTY (Virtual Terminal) access involves several critical security features.
AAA authentication (configured via aaa new-model and aaa authentication login) is required to verify user identities against a local or remote database before granting access to the command line interface,.
SSH-only access is a vital hardening step achieved by the transport input ssh command, which restricts management sessions to SSH while refusing insecure cleartext protocols like Telnet to protect credentials and data via encryption,.
Finally, ACL filtering for incoming connections is applied using the access-class command on the VTY lines, enabling administrators to restrict access only to specific authorized source IP addresses or subnets,.
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