What is the purpose of /etc/uucp/Devices?

All of the following commands could be used to verify availability of tty devices on the system EXCEPT:

A gateway machine has access to the Internet and istrying to reach a machine on the Internet called cactus.org. Although the gateway machine cannot reach cactus.org, another network across town is able to reach cactus.org. Furthermore, the gateway machine can reach the network across town, but cannot ping the cactus.org. Which of the following tools will best help diagnose the location of the problem?

Which of the following local files is used to run the date command on the remote machine “Earth” usingthe following rexec command without request for a password? rexec Earth date

Which command can be used to verify that filesystems are being exported by a server?

The options on the NFS server using the nfso command have been adjusted. Which of the following tasks are required in order for these changes to survive a system reboot?

Which of the following lines will be added to the file /usr/lib/uucp/Devices on the SLIP client machine for a SLIP
connection on tty1?

Which of the following is TRUE about the ate program?

What is the default order for resolving hostname?
I. BIND/DNS (named)
II. NIS
III. /etc/hosts
IV. NSORDER environment variable

A system administrator has created tty2 on a serialport connection to a system. When attempting to verify the connection the following error is observed:
# cu -ml tty2
cu: 0835-028 The connection failed. NO DEVICES AVAILABLE.
Which of the following should be performed to correct this error?