Networks, Linux and Systems: The Technical Foundations of Cybersecurity Quiz

Quiz: Networks, the basics

Pass mark: 70%. You can retry as many times as you need.

1 A machine has the address 192.168.10.77/24. Which statement is correct? Single answer Its network address is 192.168.0.0. It can talk directly to 192.168.11.5 without a router. Its network address is 192.168.10.0 and its broadcast address is 192.168.10.255. It is a public address because it starts with 192.

2 Which of these addresses belong to the private ranges reserved for internal networks? (several answers) Multiple answers possible 10.4.20.9 172.20.1.1 172.32.0.5 192.168.56.101

3 You query a domain twice and the TTL shown for the A record is lower the second time. What does it most likely mean? Single answer The answer came from a cache that is counting the TTL down. The domain owner changed the address between the two queries. The server is under attack. DNS switched from UDP to TCP.

4 A user sees the padlock in the browser on a website. What does it guarantee? Single answer The website is run by a trustworthy organisation. The website contains no malware. Nobody, including the site, can see what you submit. The connection to that site is encrypted in transit.

5 In a company network with a DMZ, why is the public web server placed in the DMZ rather than in the internal LAN? (several answers) Multiple answers possible So that a compromise of the server does not give direct access to the internal LAN. So that the server no longer needs security updates. So that firewalls can apply separate, stricter rules to flows between zones. So that the server becomes invisible from the Internet.