Inside interface not recognized on Cisco ASA-5505

Question

According to this documentation it should be possible to configure NAT on Cisco ASA. However, when the example command is executed, the input is invalid. A comparable issue occurs while configuring ssh.

Outcome

configure NAT:

ciscoasa# conf t
ciscoasa(config)# nat (inside) 1 X 255.255.255.0
                       ^
ERROR: % Invalid input detected at '^' marker.

configure ssh:

ciscoasa(config)# ssh X 255.255.255.0 inside
                                      ^
ERROR: % Invalid input detected at '^' marker.

No available interfaces

ciscoasa(config)# nat (?

configure mode commands/options:
Current available interface(s):

Version

ciscoasa# sh ve

Cisco Adaptive Security Appliance Software Version 7.2(4)
Device Manager Version 5.2(4)

Subquestion: should the inside interface be configured?

Answer 1

After reading this documentation and executing the following commands:

ciscoasa# conf t
ciscoasa(config)# interface vlan X
ciscoasa(config-if)# nameif inside
INFO: Security level for "inside" set to 100 by default.
ciscoasa(config-if)# security-level Y
ciscoasa(config-if)# ip address Z 255.255.255.0
ciscoasa(config-if)# no shutdown
ciscoasa(config-if)# end

interfaces were available:

ciscoasa# conf t
ciscoasa(config)# nat (?

configure mode commands/options:
Current available interface(s):

  inside  Name of interface VlanX

and the commands specified in the question could be executed.