Networks and the internet
Answers are for parents and teachers.
1
Put in order: the server answers with HTML; the browser asks the DNS for the address; the browser shows the page; the browser sends an HTTP request.
The browser asks the DNS for the address; the browser sends an HTTP request; the server answers with HTML; the browser shows the page.
2
Which are valid IPv4 addresses? (a) 10.20.30.40 (b) 300.1.1.1 (c) 192.168.0.1 (d) 1.2.3
(a) and (c). (b) has 300 above 255; (d) has only three numbers.
3
Time to download a 6 MB file at 4 Mbps (decimal units)?
6 × 8 = 48 megabits; 48 ÷ 4 = 12 seconds.
4
Give two differences between circuit switching and packet switching.
Circuit: a line is reserved for the whole call, and it wastes the line when silent. Packet: the message is cut into numbered packets that share the lines and are rebuilt in order.