Data transmission technologies vary. Which one does Ethernet use

Which of the following best supports communication availability, acting as a countermeasure to the vulnerability of component failure

………..is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the internet due to bombardment of fake traffic.

Which of the following ensures that only authorized users can use or apply specific software applications

Which spread spectrum technology does the 802.11 b standard define for operation

Which connectionless protocol is used for its low overhead