When trying to reverse proxy a web server through Nginx, what keyword is missing from the following configuration sample?

The Samba configuration file contains the following lines:

A workstation is on the wired network with an IP address of 192.168.1.177 but is unable to access the Samba server. A wireless laptop with an IP address 192.168.2.93 can access the Samba server. Additional trouble shooting shows that almost every machine on the wired network is unable to access the Samba server.
Which alternate host allow declaration will permit wired workstations to connect to the Samba server without denying access to anyone else?
Which of the following Samba services handles the membership of a file server in an Active Directory domain?
Which of the following DNS record types is used for reverse DNS queries?
Which of the following authentication mechanisms are supported by Dovecot? (Choose three.)