Q&A

Q1:	What is the difference between a protocol standard and a protocol implementation?
A1:	A protocol standard is a system of rules. A protocol implementation is a software component that applies those rules in order to provide networking capability to a computer.
Q2:	Why did the designers of ARPAnet want a decentralized network?
A2:	They envisioned a network that would be used for military purposes, and they didn't want to concentrate critical services in a central location that could become the focus of an attack.
Q3:	Why was end-node verification an important feature of ARPAnet?
A3:	By design, the network was not supposed to be controlled from any central point. The sending and receiving computers, therefore, had to take charge of verifying their own communication.
Q4:	Why do larger networks employ name resolution?
A4:	IP addresses are difficult to remember and easy to get wrong. DNS-style domain names are easier to remember because they let you associate a word or name with the IP address.