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Intro to Computingfundamentals~5 mins

IP addresses (IPv4, IPv6) in Intro to Computing - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What is an IP address?
An IP address is a unique number that identifies a device on a network, like a home address for your computer so data knows where to go.
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beginner
What is the difference between IPv4 and IPv6?
IPv4 uses 4 groups of numbers (like 192.168.1.1) and supports about 4 billion addresses. IPv6 uses 8 groups of hexadecimal numbers (like 2001:0db8::1) and supports many more addresses to handle more devices.
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beginner
How many bits are in an IPv4 address?
An IPv4 address has 32 bits, split into 4 parts of 8 bits each, usually shown as four numbers separated by dots.
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beginner
Why was IPv6 created?
IPv6 was created because IPv4 addresses were running out due to more devices connecting to the internet. IPv6 provides a much larger pool of addresses.
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intermediate
What does the double colon (::) mean in an IPv6 address?
The double colon (::) in IPv6 means one or more groups of zeros are left out to make the address shorter and easier to read.
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How many parts does an IPv4 address have?
A4
B6
C8
D16
Which IP version uses hexadecimal numbers and colons?
AIPv4
BIPv5
CIPv3
DIPv6
Why do we need IPv6?
ATo replace Wi-Fi
BTo make IP addresses shorter
CBecause IPv4 addresses are running out
DTo make computers faster
What is the total number of bits in an IPv6 address?
A128 bits
B64 bits
C32 bits
D256 bits
What does the 'dot' (.) separate in an IPv4 address?
AWords
BGroups of numbers
CLetters
DBits
Explain the main differences between IPv4 and IPv6 addresses.
Think about size, format, and why IPv6 was needed.
You got /4 concepts.
    Describe how an IP address helps devices communicate on a network using a real-world analogy.
    Imagine sending a letter to a friend’s house.
    You got /4 concepts.

      Practice

      (1/5)
      1.

      What is the main difference between an IPv4 and an IPv6 address?

      easy
      A. IPv4 addresses are longer than IPv6 addresses.
      B. IPv4 uses eight hexadecimal groups separated by colons; IPv6 uses four decimal numbers separated by dots.
      C. IPv4 addresses use letters only; IPv6 uses numbers only.
      D. IPv4 uses four decimal numbers separated by dots; IPv6 uses eight hexadecimal groups separated by colons.

      Solution

      1. Step 1: Understand IPv4 format

        IPv4 addresses have four numbers (0-255) separated by dots, like 192.168.1.1.

      2. Step 2: Understand IPv6 format

        IPv6 addresses have eight groups of hexadecimal numbers separated by colons, like 2001:0db8:85a3::8a2e:0370:7334.

      3. Final Answer:

        IPv4 uses four decimal numbers separated by dots; IPv6 uses eight hexadecimal groups separated by colons. -> Option D

      4. Quick Check:

        IPv4 = four decimals, IPv6 = eight hex groups [OK]
      Hint: IPv4 = dots and decimals; IPv6 = colons and hex [OK]
      Common Mistakes:
      • Confusing the separator symbols (dots vs colons)
      • Thinking IPv6 uses only numbers, not hex letters
      • Assuming IPv4 addresses are longer than IPv6
      2.

      Which of the following is a valid IPv4 address?

      192.168.1.256
10.0.0.1
172.16.300.5
255.255.255.256
      easy
      A. 192.168.1.256
      B. 10.0.0.1
      C. 172.16.300.5
      D. 255.255.255.256

      Solution

      1. Step 1: Check each number range in IPv4

        Each number in IPv4 must be between 0 and 255 inclusive.

      2. Step 2: Validate each option

        192.168.1.256 has 256 (invalid), 10.0.0.1 all numbers valid, 172.16.300.5 has 300 (invalid), 255.255.255.256 has 256 (invalid).

      3. Final Answer:

        10.0.0.1 -> Option B

      4. Quick Check:

        Numbers must be 0-255 in IPv4 [OK]
      Hint: IPv4 numbers must be 0 to 255 only [OK]
      Common Mistakes:
      • Allowing numbers greater than 255
      • Confusing IPv4 with IPv6 format
      • Ignoring invalid last number in address
      3.

      What is the expanded form of the IPv6 address 2001:db8::1?

      medium
      A. 2001:0db8:0000:0000:0000:0000:0000:0001
      B. 2001:db8:0:0:0:0:1
      C. 2001:db8::0001
      D. 2001:0db8::1

      Solution

      1. Step 1: Understand IPv6 shorthand

        The double colon (::) means one or more groups of zeros are omitted.

      2. Step 2: Expand omitted zeros

        Replace :: with enough groups of 0000 to make total 8 groups: 2001:0db8:0000:0000:0000:0000:0000:0001.

      3. Final Answer:

        2001:0db8:0000:0000:0000:0000:0000:0001 -> Option A

      4. Quick Check:

        :: means fill zeros to total 8 groups [OK]
      Hint: Expand :: to enough 0000 groups for 8 total [OK]
      Common Mistakes:
      • Not filling enough zero groups
      • Leaving :: in expanded form
      • Mixing uppercase and lowercase hex letters
      4.

      Identify the error in this IPv6 address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334:1234

      medium
      A. Too many groups; IPv6 must have exactly 8 groups
      B. Invalid characters in groups
      C. Groups must be separated by dots, not colons
      D. Groups are too short; must be 5 digits each

      Solution

      1. Step 1: Count groups in the address

        There are 9 groups separated by colons, but IPv6 requires exactly 8 groups.

      2. Step 2: Check group format

        All groups use valid hexadecimal digits and colons as separators, so no other errors.

      3. Final Answer:

        Too many groups; IPv6 must have exactly 8 groups -> Option A

      4. Quick Check:

        IPv6 = exactly 8 groups separated by colons [OK]
      Hint: Count groups; IPv6 must have 8 groups [OK]
      Common Mistakes:
      • Allowing more or fewer than 8 groups
      • Confusing colons with dots
      • Thinking group length must be fixed at 5 digits
      5.

      You have the IPv4 address 192.168.1.10 and want to convert it to an IPv6-mapped IPv4 address. Which is the correct IPv6 format?

      hard
      A. 2001:db8::192.168.1.10
      B. ::192.168.1.10
      C. ::ffff:c0a8:010a
      D. 192.168.1.10::ffff

      Solution

      1. Step 1: Understand IPv6-mapped IPv4 format

        IPv6-mapped IPv4 addresses use ::ffff: followed by the IPv4 address in hexadecimal.

      2. Step 2: Convert IPv4 to hex

        192 = c0, 168 = a8, 1 = 01, 10 = 0a; combined as c0a8:010a.

      3. Step 3: Form full IPv6 address

        Combine prefix and hex: ::ffff:c0a8:010a.

      4. Final Answer:

        ::ffff:c0a8:010a -> Option C

      5. Quick Check:

        IPv4 to hex after ::ffff: prefix [OK]
      Hint: Convert IPv4 decimals to hex after ::ffff: prefix [OK]
      Common Mistakes:
      • Using dotted decimal instead of hex in IPv6
      • Placing ::ffff: after IPv4 instead of before
      • Not converting IPv4 numbers to hexadecimal