Merge pull request #177496 from v-gpettibone/pics18

Updating pics for IP filtering

Author: jborsecnik

articles/iot-hub/iot-hub-ip-filtering.md

@@ -22,27 +22,27 @@ Use IP filter to receive traffic only from a specified range of IP addresses and
 
 To get to the IP Filter settings page, select **Networking**, **Public access**, then choose **Selected IP Ranges**:
 
-:::image type="content" source="media/iot-hub-ip-filtering/ip-filter-default.png" alt-text="IoT Hub default IP filter settings":::
+:::image type="content" source="media/iot-hub-ip-filtering/ip-filter-default.png" alt-text="Screenshot showing how to set default IP filter settings.":::
 
 By default, the **IP Filter** grid in the portal for an IoT hub is empty. This default setting means that your hub blocks connections from all IP addresses. This default setting is equivalent to a rule that blocks the `0.0.0.0/0` IP address range.
 
 ## Add or edit an IP filter rule
 
 To add an IP filter rule, select **+ Add IP Filter Rule**. To quickly add your computer's IP address, click the **Add your client IP address**. 
 
-:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-add-rule.png" alt-text="Add an IP filter rule to an IoT hub":::
+:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-add-rule.png" alt-text="Screenshot showing how to add an IP filter rule to an IoT hub.":::
 
 After selecting **Add IP Filter Rule**, fill in the fields. These fields are pre-filled for you if you selected to add your client IP address.
 
-:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-after-selecting-add.png" alt-text="After selecting Add an IP Filter rule":::
+:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-after-selecting-add.png" alt-text="Screenshot that shows what to do after adding an IP filter rule.":::
 
 * Provide a **name** for the IP Filter rule. This name must be a unique, case-insensitive, alphanumeric string up to 128 characters long. Only the ASCII 7-bit alphanumeric characters plus `{'-', ':', '/', '\', '.', '+', '%', '_', '#', '*', '?', '!', '(', ')', ',', '=', '@', ';', '''}` are accepted.
 
 * Provide a single IPv4 address or a block of IP addresses in CIDR notation. For example, in CIDR notation 192.168.100.0/22 represents the 1024 IPv4 addresses from 192.168.100.0 to 192.168.103.255.
 
 After filling in the fields, select **Save** to save the rule. You see an alert notifying you that the update is in progress.
 
-:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-save-new-rule.png" alt-text="Notification about saving an IP filter rule":::
+:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-save-new-rule.png" alt-text="Screenshot that shows notification about saving an IP filter rule.":::
 
 The **Add** option is disabled when you reach the maximum of 10 IP filter rules.
 
@@ -52,13 +52,13 @@ To edit an existing rule, select the data you want to change, make the change, t
 
 To delete an IP filter rule, select the trash can icon on that row and then select **Save**. The rule is removed and the change is saved.
 
-:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-delete-rule.png" alt-text="Delete an IoT Hub IP filter rule":::
+:::image type="content" source="./media/iot-hub-ip-filtering/ip-filter-delete-rule.png" alt-text="Screenshot showing how to delete an IoT Hub IP filter rule.":::
 
 ## Apply IP filter rules to the built-in Event Hub compatible endpoint
 
 To apply the IP filter rules to the built-in Event Hub compatible endpoint, check the box next to **Apply IP filters to the built-in endpoint?**, then select **Save**.
 
-:::image type="content" source="media/iot-hub-ip-filtering/ip-filter-built-in-endpoint.png" alt-text="Image showing the toggle for the built-in endpoint and save":::
+:::image type="content" source="media/iot-hub-ip-filtering/ip-filter-built-in-endpoint.png" alt-text="Screenshot showing the toggle for the built-in endpoint.":::
 
 > [!NOTE]
 > This option isn't available to free (F1) IoT hubs. To apply IP filter rules to the built-in endpoint, use a paid IoT hub.