What does a process do when it wants to send data over the Internet?

(Many answers may apply.)

Which of the following are examples where a system relies on statistical multiplexing but it does not work due to user correlation?

(Many answers may apply.)

Source S sends packet P1, then packet P2 to destination D. The two packets traverse the same path (the same sequence of links and network devices). There is no other traffic on the Internet. P1 takes significantly longer than P2 to arrive. Which is the dominant delay component for packet P1?

You are continuously and forever downloading an infinite amount of data from a video server onto your home computer. Your home has a 10 Gbps Internet connection. However, your average throughput is 1 Gbps (so, significantly smaller than what you might expect). What might be the reason? 

(Many answers may apply.)

What does it mean that two ISPs are "peering" with each other?

Could the Internet work without Internet eXchange Points (IXPs)?

Your home network infrastructure consists of a wireless router/modem connected to the Internet over a (traditional land) phone line. Your and your mom's computers are connected to the Internet through this wireless router/modem. 

You observe that downloading Netflix movies over the Internet becomes significantly slower than usual every Saturday night. What are plausible reasons?

(Many answers may apply.)

On a 64 bits architecture, what does the following code print ?

  const char* s = "123456";
  printf("%zu\n", sizeof(s));

Note: "%zu" is indeed the correct way to print values of size_t type.

What does the following code excerpt print?

  int tab[] = { 2, 4, 6, 8, 10, 12 };
  putchar('1');
  int a = -1;
  int* p = tab + 2;
  while ((a = *p++) < 10) { printf("%d", a); }

Considering