Fix ambiguities in Quiz 1

[festradasolano]

In the following issue, the text snippets in cursive are comments from students in Piazza.

Question 1: "Which of the following constituted advantages to AT&T's elimination of in-band signaling from the phone network in the 1980s?"

Current correct answers:

• Reduction of expenditures
• Introduction of new services

Current wrong answers:

• Improved security
• Easier configuration and management

Ambiguity about answers marked as wrong:

• Improved security. "Using pre previous in-band signaling allowed a normal user hijacking management protocols using particular in-channel frequencies (see "boxing"), so authorization and accountability (pillars of a security infrastructure) were going out of the window."
• Easier configuration. "This is one of the consequences of centralized control in 99.9999% of cases. Standardization and centralization enabled tooling and change management processes."

We can fix this by being clearer on questions to avoid misunderstandings.

Question 4, one of the possible answers: "Ethane's initial goal was to support authentication of hosts in enterprise networks."

"The word authentication does not make it into the lecture, and it doesn't make it into the interview with the inventor of Ethane, even when he ventures to describe what led him to create it."

"What I was addressing was the support of the question idea. Why be vague, or misleading? Complexity awaits us only a short way down the road."

Definitely, on lectures, this project isn't associated explicitly with authentication. And some hints, such as access control policies and security, seem have not been enough to expose its idea. We can fix this by providing more information about Ethane.

Question 5. Which three artifacts and lessons that active networks affected the development of software-defined networks? Select all that apply.

Confusion about the words used in this question. Maybe, the following is more understandable: "Which three artifacts and lessons used by Active Networks affected the development of Software-Defined Networks?"