When a light signal inside the cable bounces off the cable wall and back into the cable, this is called ____.?

You want to configure two DHCP servers; one is running Windows Server 2012 R2, and the other is running Windows Server 2016. One will be the primary server, and the other should assign addresses to clients only if the primary server doesn't respond within about a second. You don't want replication to be part of the configuration. What should you configure?

A. Split scope B. DHCP failover C. Multicast scope D. Relay agent

Which of the following complexity measures is the most efficient?

a) O() b) O() c) O(n log n) d) O(n) e) O(1)