IPv6 addressing basics in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show the total number of bits in an IPv6 address.

Computer Networks

An IPv6 address is [1] bits long.

Drag options to blanks, or click blank then click option'

A64

B128

C32

D256

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing IPv6 length with IPv4 length.

Choosing 64 bits because of subnetting.

An IPv6 address is 128 bits long, which allows for a very large number of unique addresses.

2fill in blank

medium

Complete the code to identify the number of hexadecimal groups in a full IPv6 address.

Computer Networks

A full IPv6 address consists of [1] groups of hexadecimal digits separated by colons.

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A8

B4

C16

D32

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the number of groups with the number of bits.

Thinking each group is a single hexadecimal digit.

An IPv6 address is divided into 8 groups of 4 hexadecimal digits each, separated by colons.

3fill in blank

hard

Fix the error in the statement about IPv6 address shortening.

Computer Networks

In IPv6, consecutive groups of zeros can be replaced by [1] to shorten the address.

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A::

B:

C...

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single colon instead of double colon.

Using ellipsis or dashes which are invalid.

The double colon (::) is used once in an IPv6 address to replace one or more consecutive groups of zeros.

4fill in blank

hard

Fill both blanks to complete the IPv6 address format with network and interface parts.

Computer Networks

An IPv6 address is divided into a [1] part and an [2] part.

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Anetwork

Bhost

Cinterface

Dsubnet

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'host' with 'interface' in IPv6 terminology.

Using 'subnet' instead of 'network' for the first part.

An IPv6 address consists of a network part that identifies the network and an interface part that identifies the device on that network.

5fill in blank

hard

Fill all three blanks to complete the IPv6 address representation with prefix length and zero compression.

Computer Networks

An example IPv6 address is [1]::[2]/64, where [3] indicates the network prefix length.

Drag options to blanks, or click blank then click option'

A2001:0db8

B1

C/64

Dfe80

Attempts:

3 left

💡 Hint

Common Mistakes

Using an incorrect prefix length like '/128' for typical subnetting.

Not using zero compression correctly.

The address '2001:0db8::1/64' shows a typical IPv6 address with zero compression (::), the interface identifier '1', and the prefix length '/64' indicating the network portion.

Practice

1. What is the correct format of an IPv6 address?

easy

A. Four groups of decimal numbers separated by dots

B. Eight groups of hexadecimal numbers separated by colons

C. Six groups of binary numbers separated by spaces

D. Ten groups of octal numbers separated by commas

Solution

1. Step 1: Understand IPv6 address structure

   IPv6 addresses consist of eight groups of hexadecimal numbers separated by colons.

2. Step 2: Compare with other address formats

   IPv4 uses four groups of decimal numbers separated by dots, not colons.

3. Final Answer:

   Eight groups of hexadecimal numbers separated by colons -> Option B

4. Quick Check:

   IPv6 format = 8 hex groups with colons [OK]

Hint: IPv6 always uses 8 hex groups separated by colons [OK]

Common Mistakes:

• Confusing IPv6 with IPv4 format
• Thinking IPv6 uses decimal numbers
• Mixing up separators like dots or commas

2. Which of the following is a valid way to shorten an IPv6 address?

easy

A. Replace one or more consecutive groups of zeros with ::

B. Remove all colons and write numbers continuously

C. Use dots instead of colons between groups

D. Replace hexadecimal digits with decimal digits

Solution

1. Step 1: Identify IPv6 zero compression rule

   IPv6 allows replacing one or more consecutive groups of zeros with a double colon (::) to shorten the address.

2. Step 2: Check invalid shortening methods

   Removing colons or changing separators breaks the format; hexadecimal digits must remain as hex.

3. Final Answer:

   Replace one or more consecutive groups of zeros with :: -> Option A

4. Quick Check:

   Zero groups can be shortened with :: [OK]

Hint: Use :: only once to shorten zeros in IPv6 [OK]

Common Mistakes:

• Using :: more than once in the same address
• Removing colons completely
• Changing hex digits to decimal

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:db8:0:0:0:0:0:1

C. 2001:db8::0001

D. 2001:db8:0001::

Solution

1. Step 1: Understand the :: abbreviation

   The double colon (::) replaces consecutive groups of zeros. Here, it replaces six groups of zeros.

2. Step 2: Expand all groups to four hex digits

   Each group should have four digits, so 'db8' becomes '0db8' and '1' becomes '0001'.

3. Final Answer:

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

4. Quick Check:

   Expand :: to zeros and pad groups [OK]

Hint: Expand :: to zeros and pad each group to 4 digits [OK]

Common Mistakes:

• Not padding groups to 4 digits
• Misplacing zeros in expansion
• Using :: more than once

4. Identify the error in this IPv6 address: 2001::db8::1

medium

A. Missing groups of zeros

B. Using hexadecimal digits instead of decimal

C. Too many groups separated by colons

D. Using :: twice in the same address

Solution

1. Step 1: Check usage of :: in IPv6

   The double colon (::) can only appear once in an IPv6 address to replace consecutive zeros.

2. Step 2: Analyze the given address

   This address uses :: twice, which is invalid syntax.

3. Final Answer:

   Using :: twice in the same address -> Option D

4. Quick Check:

   Only one :: allowed per IPv6 address [OK]

Hint: Only one :: allowed in an IPv6 address [OK]

Common Mistakes:

• Using multiple :: in one address
• Confusing hex digits with decimal
• Ignoring colon count rules

5. You have the IPv6 address fe80::1ff:fe23:4567:890a. Which part of this address indicates it is a link-local address?

hard

A. The double colon (::)

B. The last 64 bits

C. The prefix fe80::/10

D. The hexadecimal digits '1ff'

Solution

1. Step 1: Understand link-local address prefix

   IPv6 link-local addresses always start with the prefix fe80::/10, meaning the first 10 bits are fixed as '1111111010'.

2. Step 2: Identify the prefix in the given address

   The address starts with fe80, matching the link-local prefix.

3. Final Answer:

   The prefix fe80::/10 -> Option C

4. Quick Check:

   Link-local IPv6 starts with fe80::/10 [OK]

Hint: Link-local IPv6 addresses start with fe80::/10 [OK]

Common Mistakes:

• Thinking :: indicates link-local
• Confusing interface ID with prefix
• Ignoring the prefix length