Linux essencials

What are the differences between hard disk and solid state disk?

• Hard disk have a motor and moving parts, solid state disk do not

• Hard disk can fail due to physical damage, shile solid state disk cannot fail

• /dev/sda is a hard disk devide while /dev/ssda is a solid state disk

• Solid state disk provide faster Access to stored data than a hard disk.

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

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

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

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

• In the ARPA record for 165.100.51.198.rev.

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

What information can be displayed by top?

• Existing files, ordered by their size.

• Running processes, ordered by CPU or RAM consumption.

• User accounts, ordered by the number of logins.

• User groups, ordered by the number of members.

• User accounts, ordered by the number of files.

Which of the following commands can be used to resolve a DNS name to an IP address?

• dnsname

• dns

• query

• host

• iplookup

Which of the following outputs comes from the command free?

• 
• 
• 
• 
• 

what is the UID of the user root?

• 1

• -1

• 255

• 65636

• 0

What is true about the owner of a file?

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

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

• The user owning a file must be a member of the file’s group.

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

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

What information is stored in /etc/passwd? (Choose three.)

• The user’s storage space limit

• The numerical user ID

• The username

• The encrypted password

• The user\s default shell

Which of the following tar options handle compression? (Choose two.)

• -bz

• -z

• -g

• -j

• -z2

Which of the following keys can be pressed to exit less?

• i

• x

• e

• q

• !