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- CCNA Routing and Switching 200-125
1.
Which is a valid unique-local address?
- A.fec0:1111:2e3c:eab3::5/64
- B.fe80:d2e1:e24:63::25/64
- C.fd00:1edc:bae:eea4::2478/64
- D.fc00:4fec:ecf2:343::e44/64
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Although the unique-local address scope is defined as fc00::/7, RFC 4193 states that the 8th bit must equal a one for the local (L) bit. This requires the address to always start with fd which in binary is 1111 = f and 1101 = d or 1111 1101 = fd. |
2.
You are using the EUI-64 method of allocating the host portion of the IPv6
addresses. The MAC address of the host is 401e:32e4:ff03. What is the correct IP
address that will be calculated for a network ID of fd00:3:3::?
- A.fd00:3:3::fffe:421e:32e4:ff03/64
- B.fd00:3:3::421e:32ff:fee4:ff03/64
- C.fd00:3:3::401e:32ff:fee4:ff03/64
- D.fd00:3:3::421e:32ff:ffe4:ff03/64
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| When converting a MAC address to an EUI-64 host address, the first step is to split the MAC address into 6-byte sections of 401e32 and e4ff03 and place fffe in between them: 401e:32ff:fee4:ff03. This gives you a 64-bit value comprised of a 48 bit MAC address and a 16 bit filler. You must then invert “flip” the 7th bit. Example: 40 = 0100 000 = flipped = 0100 0010 = 42. |
3.
You have been given an IPv6 address of 2030:3454:aabb::/64. What can you
conclude?
- A.The IP address is a unique-local address.
- B.The IP has been given to you by the Regional Internet Registry.
- C.The IP has been given to you by the Internet service provider.
- D.The IP has been given to you by IANA.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The IPv6 address has been given to you by the ISP with your company’s unique identifier. The first 32 bits are allocated to the ISPs, and they in turn add a unique 16-bit address for your company. This makes 32 bits + 16 bits = 48 bits. You have 16 bits for subnetting after the first 48 bits to make a full 64-bit network ID. |
4.
Which type of address always uses the EUI-64 addressing mechanism?
- A.Link-local addresses
- B.Global unicast addresses
- C.SLAAC addresses
- D.Anycast addresses
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Link-local addresses starting with fe80::/10 always configure the host portion of the address with an EUI-64 address. Note that Microsoft products default to a random host ID and can be configured to generate the host ID with EUI-64. |
5.
Which type of automatic address assignment will not allow for EUI-64 addressing?
- A.Static addressing
- B.SLAAC addressing
- C.Stateful DHCPv6 addressing
- D.Stateless DHCPv6 addressing
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Stateful DHCPv6 addressing will not allow EUI-64 addressing. This is because the DHCPv6 server is responsible for allocating an IPv6 address from a predefined pool. |
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