You've just deployed a new cisco router that connects several network segments in your organization. the router is physically located in a server room that requires an id for access. you've backed up the router configuration to a remote location in an encrypted file. you access the router configuration interface from your notebook computer using a telnet client with a username of admin anda password of admin. you have used the md5 hashing algorithm to protect the password. what should you do to increase the security of this device?