SW1(config-line)#transport input sshSW1(config-line)#exitSW1(config)#service password-encryption. IP services questions are about the supporting protocols that make a network manageable and usable: DHCP supplies addressing information, DNS resolves names, NAT translates address spaces, NTP synchronizes time, syslog records events, SNMP monitors devices, and QoS classifies or prioritizes traffic. Cisco IOS commands are precise; a similar-looking command can configure a client, a relay, a pool, or a server role depending on context. The incorrect options typically name real services but solve a different operational problem. Cisco CCNA 200-301 v1.1 includes these topics because production networks fail just as often from broken services as from broken routing. The chosen answer is the one that performs the exact function in the scenario, whether that is file transfer, address assignment, logging level selection, monitoring security, or traffic treatment.