Unit 4 · Addressing Network Devices

4.8Review: key terms and self-check

Key terms

Make sure you can explain each of these in your own words. The glossary has short definitions.

Self-check questions

Write your answers first, then open the answers to check them.

  1. How many bits are in a MAC address and an IPv4 address?
  2. Convert 203 to binary and 10010110 to decimal.
  3. Which of these are private: 172.20.5.1, 172.32.0.1, 192.168.99.5, 11.0.0.1?
  4. For 10.1.1.200/27 find network, broadcast and usable range.
  5. How many usable hosts are in a /28?
  6. What mask do you need for at least 500 hosts?
  7. Shorten fe80:0000:0000:0000:02aa:00ff:fe28:9c5a.
  8. What does ARP do?
Show answers

  1. MAC 48 bits; IPv4 32 bits.

  2. 203 = 128+64+8+2+1 = 11001011; 10010110 = 128+16+4+2 = 150.

  3. 172.20.5.1 and 192.168.99.5 are private. 172.32.0.1 is outside 172.16-172.31 and 11.0.0.1 is public.

  4. /27 block size 32; 200 lies in 192-223: network 10.1.1.192, broadcast 10.1.1.223, usable 10.1.1.193 - 10.1.1.222.

  5. 2^4 - 2 = 14.

  6. 2^9 - 2 = 510 >= 500, so 9 host bits, mask /23 (255.255.254.0).

  7. fe80::2aa:ff:fe28:9c5a.

  8. ARP finds the MAC address that corresponds to a known IP address on the local network.

Next: when you are confident with this unit, test yourself with the multiple-choice questions for Unit 4 in the Final Revision section.