ICND1 IPv4 and IPv6 2

Question 1

Which IPv6 address type is automatically assigned to every IPv6-enabled interface and is only valid on the local link?

Accepted Answer

Link-local

Answer

Link-local addresses (FE80::/10) are automatically configured on every IPv6 interface and are only routable on the local link.

Question 2

What is the valid host range for the subnet 192.168.10.64/26?

Accepted Answer

192.168.10.65 – 192.168.10.126

Answer

A /26 has 64 addresses; network=.64, broadcast=.127, so valid hosts are .65 through .126.

Question 3

Which mechanism allows an IPv6 host to automatically generate its interface ID from its 48-bit MAC address?

Accepted Answer

SLAAC with EUI-64

Answer

EUI-64 inserts FFFE in the middle of the MAC address and flips the universal/local bit to form a 64-bit interface ID used with SLAAC.

Question 4

A packet is destined for 172.16.5.200. Which subnet does this address belong to if the mask is 255.255.255.192?

Accepted Answer

172.16.5.192/26

Answer

/26 (255.255.255.192) creates blocks of 64: .0, .64, .128, .192; address .200 falls in the .192 subnet.

Question 5

Which IPv4 address class supports the most hosts per network?

Accepted Answer

Class A

Answer

Class A networks use only 8 bits for the network portion, leaving 24 bits for hosts — supporting over 16 million hosts per network.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test