Linux Essentials, version 1.6: 010-160

Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored on a DNS server?

A. In the A record for 165.100.51.198.ipv4.arpa.

B. In the PTR record for 165.100.51.198.in-addr.arpa.

C. In the RNAME record for 198-51-100-165.rev.arpa.

D. In the ARPA record for 165.100.51.198.rev.

E. In the REV record for arpa.in-addr.198.51.100.165.

What is true about the owner of a file?

A. Each file is owned by exactly one user and one group.

B. The owner of a file always has full permissions when accessing the file.

C. The user owning a file must be a member of the file's group.

D. When a user is deleted, all files owned by the user disappear.

E. The owner of a file cannot be changed once it is assigned to an owner.

Which one of the following statements concerning Linux passwords is true?

A. All passwords can be decrypted using the system administrator's master password.

B. Passwords may never start with a non-letter.

C. Users cannot change their password once it has been set.

D. Passwords are only stored in hashed form.

E. Passwords may be at most six characters long.