Cisco Certified Network Associate (CCNA) Practice Exam

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What CLI command would you use to display commands that start with the letter 'c' in Cisco IOS?

c help
c ?
c?
help c

The correct answer is: c?

The command that would effectively display commands starting with the letter 'c' in Cisco IOS is indeed formed as 'c?'. In Cisco IOS, the question mark serves as a wildcard that provides context-sensitive help. When you type 'c' followed by a question mark, the IOS interprets this as a request for a list of commands that start with the letter 'c'. When you input just 'c?' into the command-line interface, IOS will return a list of all available commands that begin with 'c', allowing you to quickly see the options you have without needing to know all commands offhand. This feature simplifies navigation and learning for users, especially for those who are new to the command line. The other options do not adhere to the correct syntax for Cisco IOS command input. For example, 'c help' and 'help c' do not utilize the question mark as a wildcard for command assistance, and thus, they won't provide the desired outcome. Using 'c ?' or 'c?' is the recognized method for context-sensitive help in Cisco IOS.