Question

Describe how DDoS attacks may be mounted against TCP and UDP services. In what way will being connection-oriented be different for TCP and UDP?

Answer 1

A distributed denial of service (DDoS) attack is a malicious attempt to make an online service unavailable to users, usually by temporarily interrupting or suspending the services of its hosting server.

A DDoS attack is launched from numerous compromised devices, often distributed globally in what is referred to as a botnet. It is distinct from other denial of service (DoS) attacks, in that it uses a single Internet-connected device (one network connection) to flood a target with malicious traffic. This nuance is the main reason for the existence of these two, somewhat different, definitions.

A UDP flood, by definition, is any DDoS attack that floods a target with User Datagram Protocol (UDP) packets. The goal of the attack is to flood random ports on a remote host. This causes the host to repeatedly check for the application listening at that port, and (when no application is found) reply with an ICMP ‘Destination Unreachable’ packet. This process saps host resources, which can ultimately lead to inaccessibility.

Connection-oriented describes a means of transmitting data in which the devices at the end points use a preliminary protocol to establish an end-to-end connection before any data is sent. Connection-oriented protocol service is sometimes called a "reliable" network service, because it guarantees that data will arrive in the proper sequence.

TRANSMISSION CONTROL PROTOCOL (TCP)	USER DATAGRAM PROTOCOL (UDP)
TCP is a connection-oriented protocol. Connection-orientation means that the communicating devices should establish a connection before transmitting data and should close the connection after transmitting the data.	UDP is the Datagram oriented protocol. This is because there is no overhead for opening a connection, maintaining a connection, and terminating a connection. UDP is efficient for broadcast and multicast type of network transmission.