LPIC-2 Advanced Networking Configuration Practice Question
Which of the following is the correct command to add an IPv6 address 2001:db8::1/64 to interface eth0?
⚠ Common exam trap
The trap here is that candidates often forget the `-6` flag or the prefix length, assuming the `ip` command can infer IPv6 context automatically, or they mistakenly use deprecated `ifconfig` syntax from older Linux distributions.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ip -6 addr add 2001:db8::1/64 dev eth0
The `ip -6 addr add` command is the proper way to add an IPv6 address to an interface using the `ip` tool from the iproute2 suite. The `-6` option restricts the operation to IPv6, and the address must include the prefix length (`/64`) to define the subnet. The `dev eth0` parameter specifies the target interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ip -6 addr add 2001:db8::1/64 dev eth0
Why this is correct
Correct syntax with -6 flag and prefix length.
- ✗
ip addr add 2001:db8::1/64 dev eth0
Why it's wrong here
Missing -6 flag; treats address as IPv4 by default.
- ✗
ip -6 addr add 2001:db8::1 dev eth0
Why it's wrong here
Missing prefix length.
- ✗
ip link set eth0 ipv6 2001:db8::1/64
Why it's wrong here
Wrong command; ip link set does not set IP addresses.
- ✗
ifconfig eth0 inet6 add 2001:db8::1/64
Why it's wrong here
ifconfig is deprecated and may not support /64 notation.
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