Networking › Module 2 › Lesson 5
Quiz — IP Addressing
Test your knowledge of IPv4, subnetting, IPv6, and public vs private IPs
Opening
IP Addressing — Knowledge Check
You read 32-bit dotted decimal, worked /24 versus /26, met IPv6 (::1, fe80::, dual stack), and split RFC1918 from the address a website sees after NAT. These ten APPLY scenarios test judgment — not octet trivia. Choose the best defensive or lab move.
Knowledge Check
APPLY: ip -br addr shows lo 127.0.0.1/8 and wlan0 192.168.1.42/24. A teammate on another continent asks you to "SSH to your IP" using 127.0.0.1. What failed in their mental model?
Multiple choice
Knowledge Check
APPLY: You must decide whether 192.168.1.50 and 192.168.1.70 are on-link neighbors. Both masks are /26. What is the right calculation?
Multiple choice
Knowledge Check
APPLY: A junior pastes a 20-row CIDR table into Slack but cannot say why /24 has 256 addresses. What should they have done instead?
Multiple choice
Knowledge Check
APPLY: True or False: An IPv4 address in a log is equivalent to a password: it uniquely authenticates a human and must be stored only in a vault.
True or False
Knowledge Check
APPLY: ip -6 addr shows ::1 and fe80::abcd on eth0, plus a global 2001:db8::10. IPv4 sshd is firewalled. sshd also listens on [::]:22. Best SOC move?
Multiple choice
Knowledge Check
APPLY: Which statement about IPv6 compression is the one you would trust in a ticket?
Multiple choice
Knowledge Check
APPLY: Home ip addr shows 192.168.0.12/24. A trusted "what is my IP" page shows 198.51.100.7. CGNAT might even sit in between. What do you record?
Multiple choice
Knowledge Check
APPLY: You sit on cafe Wi-Fi with a 10.0.0.0/8 address. You want "real subnetting practice." Allowed action?
Multiple choice
Knowledge Check
APPLY: A firewall object uses 172.32.1.0/24 labeled "RFC1918 servers." What is wrong, and why does it matter?
Multiple choice
Knowledge Check
APPLY: True or False: Mask 255.255.255.0 is /24, that /24 contains 256 IPv4 addresses, and subnetting exists partly so broadcast domains and security zones can be smaller than one giant flat LAN.
True or False
Answer all 10 knowledge checks to continue. (0/10 answered)