DDoS stands for Distributed Denial of Service, which is a type of cyberattack that attempts to make a computer or network resource unavailable to its intended users.

The primary goal of a DDoS attack is to disrupt online services by overwhelming the target with a flood of traffic, making it unavailable to legitimate users.

ARP spoofing is a type of network attack that exploits the Address Resolution Protocol (ARP) to redirect traffic to a malicious host. It is not a common type of DDoS attack.

Using a DDoS mitigation service is the most effective way to mitigate a DDoS attack. These services provide specialized protection against DDoS attacks and can help to absorb and redirect malicious traffic.

An application-layer DDoS attack targets a specific application or service by flooding it with requests, causing it to become unavailable to legitimate users.

Using a CDN is not a common defense mechanism against DDoS attacks. A CDN is used to distribute content across multiple servers to improve performance and reliability, but it does not provide protection against DDoS attacks.

A botnet DDoS attack uses multiple compromised devices, known as bots, to launch a DDoS attack. These bots are controlled by a central command and control server and can be used to generate a large amount of traffic to overwhelm the target.

Improved website performance is not a common impact of a DDoS attack. DDoS attacks typically result in decreased website performance or even complete unavailability.

A protocol-layer DDoS attack targets a specific network protocol by sending malformed packets or exploiting vulnerabilities in the protocol.

HTTP flood attacks target the application layer, not the network layer. ICMP flood attacks, SYN flood attacks, and UDP flood attacks are all common types of DDoS attacks that target the network layer.

A transport-layer DDoS attack targets a specific transport protocol, such as TCP or UDP, by sending malformed packets or exploiting vulnerabilities in the protocol.

Implementing ACLs is not a common defense mechanism against DDoS attacks at the network layer. ACLs are used to control access to network resources, but they do not provide protection against DDoS attacks.

An application-layer DDoS attack targets a specific application or service by exploiting vulnerabilities in the application code. This type of attack can cause the application to crash or become unavailable.

Blacklisting malicious IP addresses is not a common defense mechanism against DDoS attacks at the application layer. Blacklisting is typically used to prevent access to specific IP addresses at the network layer.

A botnet DDoS attack uses a large number of compromised devices, known as bots, to launch a DDoS attack. These bots are controlled by a central command and control server and can be used to generate a large amount of traffic to overwhelm the target.