diff --git a/features/check-network-required-plugins.feature b/features/check-network-required-plugins.feature
new file mode 100644
index 0000000..f2dc83f
--- /dev/null
+++ b/features/check-network-required-plugins.feature
@@ -0,0 +1,55 @@
+Feature: Check required network plugins
+
+  Scenario: Verify check description
+    Given an empty directory
+    And a config.yml file:
+      """
+      network-required-plugins:
+        check: Network_Required_Plugins
+        options:
+          plugins:
+            - akismet
+      """
+
+    When I try `wp doctor list --fields=name,description --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                     | description                                                  |
+      | network-required-plugins | Errors when required plugins are not network-activated.      |
+
+  Scenario: Required plugin is not network-activated
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-required-plugins:
+        check: Network_Required_Plugins
+        options:
+          plugins:
+            - akismet
+      """
+
+    When I try `wp doctor check network-required-plugins --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                     | status | message                                                                                |
+      | network-required-plugins | error  | Required network plugin check failed. Not network-activated: akismet (inactive).      |
+    And STDERR should contain:
+      """
+      Error: 1 check reports 'error'.
+      """
+    And the return code should be 1
+
+  Scenario: Required plugin is network-activated
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-required-plugins:
+        check: Network_Required_Plugins
+        options:
+          plugins:
+            - akismet
+      """
+    And I run `wp plugin activate akismet --network`
+
+    When I run `wp doctor check network-required-plugins --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                     | status  | message                                            |
+      | network-required-plugins | success | All required plugins are network-activated.        |
diff --git a/features/check-network-site-count.feature b/features/check-network-site-count.feature
new file mode 100644
index 0000000..6e466c2
--- /dev/null
+++ b/features/check-network-site-count.feature
@@ -0,0 +1,46 @@
+Feature: Check multisite network site count
+
+  Scenario: Verify check description
+    Given an empty directory
+    And a config.yml file:
+      """
+      network-site-count:
+        check: Network_Site_Count
+      """
+
+    When I try `wp doctor list --fields=name,description --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name               | description                                                                  |
+      | network-site-count | Warns when multisite network site count is outside the range 1-500.         |
+
+  Scenario: Site count is within expected range
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-site-count:
+        check: Network_Site_Count
+        options:
+          minimum: 1
+          maximum: 10
+      """
+
+    When I run `wp doctor check network-site-count --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name               | status  | message                                         |
+      | network-site-count | success | Network has 1 sites; expected between 1 and 10. |
+
+  Scenario: Site count is outside expected range
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-site-count:
+        check: Network_Site_Count
+        options:
+          minimum: 2
+          maximum: 10
+      """
+
+    When I run `wp doctor check network-site-count --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name               | status  | message                                         |
+      | network-site-count | warning | Network has 1 sites; expected between 2 and 10. |
diff --git a/features/check-network-site-option-value.feature b/features/check-network-site-option-value.feature
new file mode 100644
index 0000000..d47d907
--- /dev/null
+++ b/features/check-network-site-option-value.feature
@@ -0,0 +1,100 @@
+Feature: Check the value of a network option
+
+  Scenario: Verify check description
+    Given an empty directory
+    And a config.yml file:
+      """
+      network-registration:
+        check: Network_Site_Option_Value
+        options:
+          option: registration
+          value: none
+      """
+
+    When I try `wp doctor list --fields=name,description --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                 | description                                                     |
+      | network-registration | Confirms the expected value of the network option 'registration'. |
+
+  Scenario: Check the value of a network option
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-registration:
+        check: Network_Site_Option_Value
+        options:
+          option: registration
+          value: all
+      """
+    And I run `wp eval 'update_site_option( "registration", "none" );'`
+
+    When I try `wp doctor check network-registration --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                 | status  | message                                                              |
+      | network-registration | error   | Network option 'registration' is 'none' but expected to be 'all'.    |
+    And STDERR should contain:
+      """
+      Error: 1 check reports 'error'.
+      """
+    And the return code should be 1
+
+    When I run `wp eval 'update_site_option( "registration", "all" );'`
+    Then STDOUT should be empty
+
+    When I run `wp doctor check network-registration --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                 | status  | message                                                  |
+      | network-registration | success | Network option 'registration' is 'all' as expected.      |
+
+  Scenario: Check value_is_not for a network option
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-registration:
+        check: Network_Site_Option_Value
+        options:
+          option: registration
+          value_is_not: none
+      """
+    And I run `wp eval 'update_site_option( "registration", "none" );'`
+
+    When I try `wp doctor check network-registration --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                 | status  | message                                                             |
+      | network-registration | error   | Network option 'registration' is 'none' and expected not to be.     |
+    And STDERR should contain:
+      """
+      Error: 1 check reports 'error'.
+      """
+    And the return code should be 1
+
+    When I run `wp eval 'update_site_option( "registration", "all" );'`
+    Then STDOUT should be empty
+
+    When I run `wp doctor check network-registration --config=config.yml`
+    Then STDOUT should be a table containing rows:
+      | name                 | status  | message                                                        |
+      | network-registration | success | Network option 'registration' is not 'none' as expected.      |
+
+  Scenario: Gracefully render array values in error messages
+    Given a WP multisite installation
+    And a config.yml file:
+      """
+      network-registration:
+        check: Network_Site_Option_Value
+        options:
+          option: registration
+          value: none
+      """
+    And I run `wp eval 'update_site_option( "registration", array( "users" => "all" ) );'`
+
+    When I try `wp doctor check network-registration --config=config.yml`
+    Then STDOUT should contain:
+      """
+      Network option 'registration' is '{"users":"all"}' but expected to be 'none'.
+      """
+    And STDERR should contain:
+      """
+      Error: 1 check reports 'error'.
+      """
+    And the return code should be 1
diff --git a/src/Check/Network_Required_Plugins.php b/src/Check/Network_Required_Plugins.php
new file mode 100644
index 0000000..970bb90
--- /dev/null
+++ b/src/Check/Network_Required_Plugins.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace WP_CLI\Doctor\Check;
+
+use WP_CLI;
+use WP_CLI\Doctor\Check;
+
+/**
+ * Errors when required plugins are not network-activated.
+ */
+class Network_Required_Plugins extends Check {
+
+	/**
+	 * List of required plugin slugs.
+	 *
+	 * @var array
+	 */
+	protected $plugins = array();
+
+	public function __construct( $options = array() ) {
+		parent::__construct( $options );
+
+		if ( is_string( $this->plugins ) ) {
+			$this->plugins = explode( ',', $this->plugins );
+		}
+		if ( ! is_array( $this->plugins ) ) {
+			WP_CLI::error( 'Invalid plugins option. Provide an array or comma-delimited string.' );
+		}
+		$this->plugins = array_values( array_filter( array_map( 'trim', $this->plugins ) ) );
+		if ( empty( $this->plugins ) ) {
+			WP_CLI::error( 'At least one plugin slug is required.' );
+		}
+	}
+
+	public function run() {
+		if ( ! is_multisite() ) {
+			$this->set_status( 'success' );
+			$this->set_message( 'WordPress is not a multisite installation; required network plugin check skipped.' );
+			return;
+		}
+
+		if ( ! function_exists( 'get_plugins' ) || ! function_exists( 'is_plugin_active' ) || ! function_exists( 'is_plugin_active_for_network' ) ) {
+			require_once ABSPATH . 'wp-admin/includes/plugin.php';
+		}
+
+		$installed_plugins = get_plugins();
+
+		$missing            = array();
+		$not_network_active = array();
+		foreach ( $this->plugins as $plugin_slug ) {
+			$plugin_file = $this->get_plugin_file( $plugin_slug, $installed_plugins );
+			if ( null === $plugin_file ) {
+				$missing[] = $plugin_slug;
+				continue;
+			}
+
+			if ( is_plugin_active_for_network( $plugin_file ) ) {
+				continue;
+			}
+
+			$status               = is_plugin_active( $plugin_file ) ? 'active' : 'inactive';
+			$not_network_active[] = "{$plugin_slug} ({$status})";
+		}
+
+		if ( empty( $missing ) && empty( $not_network_active ) ) {
+			$this->set_status( 'success' );
+			$this->set_message( 'All required plugins are network-activated.' );
+			return;
+		}
+
+		$parts = array();
+		if ( ! empty( $missing ) ) {
+			$parts[] = 'Missing plugins: ' . implode( ', ', $missing ) . '.';
+		}
+		if ( ! empty( $not_network_active ) ) {
+			$parts[] = 'Not network-activated: ' . implode( ', ', $not_network_active ) . '.';
+		}
+		$this->set_status( 'error' );
+		$this->set_message( 'Required network plugin check failed. ' . implode( ' ', $parts ) );
+	}
+
+	/**
+	 * Resolve a plugin slug or file to an installed plugin file path.
+	 *
+	 * @param string $plugin_slug Requested plugin slug/file.
+	 * @param array  $installed_plugins Installed plugins keyed by plugin file.
+	 * @return string|null
+	 */
+	private function get_plugin_file( $plugin_slug, $installed_plugins ) {
+		if ( isset( $installed_plugins[ $plugin_slug ] ) ) {
+			return $plugin_slug;
+		}
+
+		foreach ( array_keys( $installed_plugins ) as $plugin_file ) {
+			$directory_slug = dirname( $plugin_file );
+			if ( '.' !== $directory_slug && $directory_slug === $plugin_slug ) {
+				return $plugin_file;
+			}
+
+			$file_slug = basename( $plugin_file, '.php' );
+			if ( $file_slug === $plugin_slug ) {
+				return $plugin_file;
+			}
+		}
+
+		return null;
+	}
+}
diff --git a/src/Check/Network_Site_Count.php b/src/Check/Network_Site_Count.php
new file mode 100644
index 0000000..f2359ef
--- /dev/null
+++ b/src/Check/Network_Site_Count.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace WP_CLI\Doctor\Check;
+
+use WP_CLI;
+use WP_CLI\Doctor\Check;
+
+/**
+ * Warns when multisite network site count is outside the range %minimum%-%maximum%.
+ */
+class Network_Site_Count extends Check {
+
+	/**
+	 * Minimum number of sites expected in the network.
+	 *
+	 * @var integer
+	 */
+	protected $minimum = 1;
+
+	/**
+	 * Maximum number of sites expected in the network.
+	 *
+	 * @var integer
+	 */
+	protected $maximum = 500;
+
+	public function __construct( $options = array() ) {
+		parent::__construct( $options );
+
+		$this->minimum = (int) $this->minimum;
+		$this->maximum = (int) $this->maximum;
+		if ( $this->minimum < 0 || $this->maximum < 0 || $this->maximum < $this->minimum ) {
+			WP_CLI::error( 'Invalid thresholds. Ensure 0 <= minimum <= maximum.' );
+		}
+	}
+
+	public function run() {
+		if ( ! is_multisite() ) {
+			$this->set_status( 'success' );
+			$this->set_message( 'WordPress is not a multisite installation; network site count check skipped.' );
+			return;
+		}
+
+		$count = (int) get_sites( array( 'count' => true ) );
+
+		if ( $count < $this->minimum || $count > $this->maximum ) {
+			$this->set_status( 'warning' );
+			$this->set_message( "Network has {$count} sites; expected between {$this->minimum} and {$this->maximum}." );
+			return;
+		}
+
+		$this->set_status( 'success' );
+		$this->set_message( "Network has {$count} sites; expected between {$this->minimum} and {$this->maximum}." );
+	}
+}
diff --git a/src/Check/Network_Site_Option_Value.php b/src/Check/Network_Site_Option_Value.php
new file mode 100644
index 0000000..3b750b7
--- /dev/null
+++ b/src/Check/Network_Site_Option_Value.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace WP_CLI\Doctor\Check;
+
+use WP_CLI\Doctor\Check;
+
+/**
+ * Confirms the expected value of the network option '%option%'.
+ */
+class Network_Site_Option_Value extends Check {
+
+	/**
+	 * Name of the network option.
+	 *
+	 * @var string
+	 */
+	protected $option;
+
+	/**
+	 * Expected value of the network option.
+	 *
+	 * @var mixed
+	 */
+	protected $value;
+
+	/**
+	 * Value that the network option is expected not to be.
+	 *
+	 * @var mixed
+	 */
+	protected $value_is_not;
+
+	public function run() {
+		if ( ! is_multisite() ) {
+			$this->set_status( 'success' );
+			$this->set_message( 'WordPress is not a multisite installation; network option check skipped.' );
+			return;
+		}
+
+		if ( isset( $this->value ) && isset( $this->value_is_not ) ) {
+			$this->set_status( 'error' );
+			$this->set_message( 'You must use either "value" or "value_is_not".' );
+			return;
+		}
+
+		if ( ! isset( $this->value ) && ! isset( $this->value_is_not ) ) {
+			$this->set_status( 'error' );
+			$this->set_message( 'You must specify "value" or "value_is_not".' );
+			return;
+		}
+
+		$actual_value = get_site_option( $this->option );
+
+		if ( isset( $this->value ) ) {
+			if ( $actual_value == $this->value ) { // phpcs:ignore Universal.Operators.StrictComparisons -- Keep existing behavior.
+				$this->set_status( 'success' );
+				$this->set_message( "Network option '{$this->option}' is '" . $this->format_value_for_message( $this->value ) . "' as expected." );
+			} else {
+				$this->set_status( 'error' );
+				$this->set_message( "Network option '{$this->option}' is '" . $this->format_value_for_message( $actual_value ) . "' but expected to be '" . $this->format_value_for_message( $this->value ) . "'." );
+			}
+			return;
+		}
+
+		if ( $actual_value == $this->value_is_not ) { // phpcs:ignore Universal.Operators.StrictComparisons -- Keep existing behavior.
+			$this->set_status( 'error' );
+			$this->set_message( "Network option '{$this->option}' is '" . $this->format_value_for_message( $actual_value ) . "' and expected not to be." );
+		} else {
+			$this->set_status( 'success' );
+			$this->set_message( "Network option '{$this->option}' is not '" . $this->format_value_for_message( $this->value_is_not ) . "' as expected." );
+		}
+	}
+
+	/**
+	 * Format arbitrary option values for stable string output.
+	 *
+	 * @param mixed $value Value to render.
+	 * @return string
+	 */
+	private function format_value_for_message( $value ) {
+		if ( is_array( $value ) || is_object( $value ) ) {
+			$encoded = wp_json_encode( $value );
+			if ( false !== $encoded ) {
+				return $encoded;
+			}
+			return 'unrepresentable value';
+		}
+
+		if ( null === $value ) {
+			return 'null';
+		}
+		if ( true === $value ) {
+			return 'true';
+		}
+		if ( false === $value ) {
+			return 'false';
+		}
+		return (string) $value;
+	}
+}
diff --git a/src/Command.php b/src/Command.php
index 9c76b7f..aeea080 100644
--- a/src/Command.php
+++ b/src/Command.php
@@ -337,7 +337,9 @@ public function list_( $args, $assoc_args ) {
 				if ( '_' === $prop_name[0] ) {
 					continue;
 				}
-				$prop->setAccessible( true );
+				if ( PHP_VERSION_ID < 80100 ) {
+					$prop->setAccessible( true );
+				}
 				$value = $prop->getValue( $class );
 				if ( is_array( $value ) ) {
 					$value = json_encode( $value );