200-301 Question 101
Single answerA network administrator is configuring IPv6 addressing on a network. The administrator assigns an IPv6 address of fe80::1 to one of the interfaces and 2001:db8::10 to another interface on the same router. Which statement is TRUE about these addresses?
- A
fe80::1 is a global unicast address.
- B
2001:db8::10 is a unique local address.
- C
fe80::1 can only be used for communication within the same link.
- D
2001:db8::10 can be routed across the internet.
Show answer and explanation
Correct answer: C
Explanation
IPv6 defines multiple address types. Link-local addresses, such as fe80::/10, are valid only within a single link and cannot be routed beyond it. Global unicast addresses, such as those in the 2000::/3 range (excluding reserved ones like 2001:db8::/32), are designed for internet routing. Unique local addresses are in the fc00::/7 range and are used for private communication within an organization.
- A. Incorrect.
fe80::1 is a link-local address, not a global unicast address. Link-local addresses are automatically assigned and used for communication within a single link.
- B. Incorrect.
2001:db8::10 is a global unicast address, not a unique local address. Unique local addresses are in the fc00::/7 range.
- C. Correct.
Correct: fe80::1 is a link-local address and can only be used for communication between devices on the same physical or logical link.
- D. Incorrect.
While 2001:db8::10 is a global unicast address, addresses in the 2001:db8::/32 block are reserved for documentation and cannot be routed across the internet.