To enter standard named ACL configuration mode, which command do you use?

To enter standard named ACL configuration mode, the correct command is "ip access-list standard acl-name." This command initiates the process of creating or modifying a standard named access control list (ACL) within the Cisco IOS environment.

Using "ip access-list standard" signifies that you are about to configure an ACL that is named (as opposed to a numbered access list). The "acl-name" represents the specific name you assign to this ACL, which can be used later to reference the ACL in other configurations, such as applying it to an interface or using it for filter rules.

This command structure is part of the Cisco IOS command syntax, where the 'ip access-list' command is a prerequisite for configuring any type of named access list. It clearly distinguishes the type of access list being configured, ensuring that the router or switch understands that the user intends to work within the context of IP traffic filtering, specifically with a named standard ACL.

The other options do not correctly follow the Cisco IOS command syntax for entering named ACL configuration mode, which is why they would not achieve the desired outcome of creating or modifying a named standard ACL.