Access control matrix in Operating Systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the Access Control Matrix as a table of subjects and objects.

Operating Systems

access_control_matrix = {"subjects": ["Alice", "Bob"], "objects": ["File1", [1]]}

Drag options to blanks, or click blank then click option'

A"Folder1"

B"File3"

C"File2"

D"Printer1"

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a subject name instead of an object name.

Using a resource name that is not typical for access control.

The Access Control Matrix lists objects such as files or resources. "File2" is a valid object name to include.

2fill in blank

medium

Complete the code to assign read permission to Alice for File1.

Operating Systems

access_control_matrix["permissions"] = {"Alice": {"File1": [1]

Drag options to blanks, or click blank then click option'

A"write"

B"read"

C"execute"

D"delete"

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing read with write or execute permissions.

Using a permission that is not typical for file access.

Read permission allows Alice to view the contents of File1, which is a common access right.

3fill in blank

hard

Fix the error in the code to correctly represent the Access Control Matrix entry for Bob's execute permission on File2.

Operating Systems

access_control_matrix["permissions"]["Bob"]["File2"] = [1]

Drag options to blanks, or click blank then click option'

Aexecute

B"Execute"

C'execute'

D"execute"

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting quotes around the permission string.

Using incorrect capitalization.

The permission must be a string enclosed in double quotes exactly as "execute" to be valid.

4fill in blank

hard

Fill both blanks to create a dictionary entry for Carol with write permission on Folder1.

Operating Systems

access_control_matrix["permissions"][[1]] = { [2]: "write" }

Drag options to blanks, or click blank then click option'

A"Carol"

B"Alice"

C"Folder1"

D"File1"

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping subject and object names.

Using a subject or object not defined in the matrix.

Carol is the subject, and Folder1 is the object with write permission assigned.

5fill in blank

hard

Fill all three blanks to define a new entry where Dave has read and execute permissions on Printer1.

Operating Systems

access_control_matrix["permissions"][[1]] = { [2]: ["read", [3]] }

Drag options to blanks, or click blank then click option'

A"Dave"

B"Printer1"

C"execute"

D"File3"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect object or subject names.

Not including both permissions correctly.

Dave is the subject, Printer1 is the object, and the permissions are read and execute.