Control and Management Plane Protection

D.

The mechanism that protects the control and management planes of a Cisco IOS device to maintain routing stability, network reachability, and packet delivery is called Control Plane Policing (CPPr).

CPPr is a security feature that helps ensure that the CPU of a network device is not overloaded with unnecessary traffic that can impact the control plane, which is responsible for managing the device's routing and forwarding decisions. CPPr limits the amount of traffic that is sent to the control plane by dropping packets that exceed a predefined threshold. This helps prevent resource depletion and potential network outages.

CPPr can be configured using access control lists (ACLs) to specify which traffic should be policed, and it can be applied to various protocols, such as OSPF, BGP, and ICMP. CPPr also supports the use of rate limiting and packet marking to further control the flow of traffic to the control plane.

Option A, Remote Triggered Black Hole (RTBH), is a routing technique used to drop traffic destined for a specific IP address or range. RTBH is not specifically designed to protect the control and management planes of a Cisco IOS device.

Option B, BGP Flow Spec, is a feature that allows network operators to specify and enforce traffic filtering policies based on various criteria, such as source/destination IP address, protocol, and port number. While BGP Flow Spec can be used to protect the control and management planes of a Cisco IOS device, it is primarily used for traffic filtering at the edge of the network.

Option C, Management and Operations Center Command Line Interface (MOC CLI), is not a security feature, but rather a tool used to manage and monitor Cisco network devices.

Option E, NetFlow, is a network protocol that collects and analyzes network traffic data to provide visibility into network performance and security. NetFlow can be used to monitor traffic to the control and management planes of a Cisco IOS device, but it does not specifically protect these planes from potential attacks or overload.