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Users cannot access a webserver and after the traffic is captured, the capture too* shows an ICMP packet that reports "communication administratively prohibited" What Is the cause of this webserver access Issue?
Correct Answer: A
When users cannot access a web server and the captured traffic shows an ICMP packet that reports "communication administratively prohibited," it indicates that there is a filtering device along the path, such as a router or firewall, that is intentionally blocking the traffic. This usually happens because of an access control list (ACL) that is set to deny the traffic to the webserver. * Access Control Lists (ACLs): ACLs are used in networking to control the flow of traffic into or out of a network. They can be configured on routers, firewalls, or other devices to allow or deny traffic based on IP addresses, protocols, ports, and other criteria. * ICMP Messages: ICMP (Internet Control Message Protocol) is used by network devices to send error messages and operational information. The "communication administratively prohibited" message specifically indicates that a device along the path has been configured to block the traffic. * Troubleshooting Steps: * Check ACL Configuration: Verify the ACL settings on all devices along the path to ensure that they are not blocking the required traffic. * Review Network Device Logs: Check logs on routers and firewalls for entries that match the blocked traffic. * Modify ACLs: If an ACL is found to be blocking the traffic, modify it to allow the required traffic to pass through. References: * Cisco Documentation on ACLs: Access Control Lists * Cisco ICMP Overview: ICMP Messages