Numerous comments to the "terminal exec prompt" post told me that it might be good to review the line/terminal configuration rules:

• If you want to configure a permanent line characteristic (for example, international), you should do so in the VTY configuration (see also how the VTY configurations are merged);
• If you want a temporary change in the characteristic of your current line (VTY or console), use terminal characteristic to enable it or terminal no characteristic to disable it.

For example, IOS performs DNS lookups on all names entered by a user (assuming the ip domain-lookup is not disabled). You can change that behavior with the domain-lookup characteristic (enabled by default). To permanently disable DNS lookups on all VTYs use:

line vty 0 4
 no domain-lookup

To disable the lookup for the current session, use terminal no domain-lookup.