File Permission and File Access Challenge

Question 1

A file has permissions set to 640. Which access does this grant?

Accepted Answer

Owner: read/write, group: read, others: none

Answer

Owner: read/write/execute, group: read, others: none

Answer

Owner: read/write, group: write, others: none

Answer

Owner: read, group: read, others: none

Question 2

On a Unix-like system, which permission is required on a directory in order to enter it with commands like cd?

Accepted Answer

Execute

Answer

Read

Answer

Write

Answer

Setuid

Question 3

What is the usual effect of a umask value of 022 on newly created regular files, assuming the application uses the common default creation mode?

Accepted Answer

They become 644

Answer

They become 777

Answer

They become 755

Answer

They become 600

Question 4

Which command changes the owner of a file on most Unix-like systems?

Accepted Answer

chown

Answer

chmod

Answer

chgrp

Answer

umask

Question 5

If a user has write permission on a file but lacks write permission on the containing directory, which action is typically blocked?

Accepted Answer

Renaming or deleting the file

Answer

Reading the file contents

Answer

Modifying the file contents

Answer

Checking the file size

Question 6

What does the sticky bit on a shared directory like /tmp primarily help prevent?

Accepted Answer

Users from deleting or renaming files they do not own

Answer

Users from reading each other's files

Answer

Users from executing files in the directory

Answer

Programs from creating temporary files

Question 7

In a long listing such as -rwsr-xr-x, what does the s in the owner's execute position indicate?

Accepted Answer

The setuid bit is enabled

Answer

The file is shared over the network

Answer

The file is a symbolic link

Answer

The file is system-owned

Question 8

Why are Access Control Lists (ACLs) used in addition to traditional owner/group/others permissions?

Accepted Answer

They allow more granular permissions for specific users and groups

Answer

They compress permission data to save disk space

Answer

They replace the need for file ownership entirely

Answer

They automatically encrypt protected files

Question 9

A file is marked executable, but trying to run it returns 'Permission denied' because its parent directory lacks a needed permission. Which directory permission is most likely missing?

Accepted Answer

Execute

Answer

Read

Answer

Write

Answer

Setgid

Question 10

On many Unix-like systems, what is a common purpose of setting the setgid bit on a project directory?

Accepted Answer

To ensure new files inherit the directory's group

Answer

To make all new files executable by default

Answer

To force only the owner to access new files

Answer

To prevent the directory from being listed

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