Why is it important to ensure that DNS Servers have been secured before implementing an e-mail system

What are two of the most common reasons that peolpe who need mental health care do not access it?

Problem 1 - hashing we would like to use initials to locate an individual. for instance, mel should locate the person mark e. lehr. note: this is all upper case. generate a hash function for the above using the numbers on your telephone. you know, each letter has a number associated with it, so examine your telephone keypad. generate 512 random 3 letter initials and take statistics on a linked list array size 512 to hold this information report how many have no elements, 1 element, 2 elements, does this agree with the hashing statistics distribution?

Anetwork security application that prevents access between a private and trusted network and other untrusted networks