Cisco CCNA IPv4 and IPv6 Addressing 2

Question 1

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.

Question 2

What is the subnet mask for a /26 prefix length in dotted-decimal notation?

Accepted Answer

255.255.255.192

Answer

A /26 mask has 26 consecutive 1-bits, giving 255.255.255.192 (11000000 in the last octet).

Question 3

An IPv6 address written as 2001:0DB8:0000:0000:0000:0000:0000:0001 can be abbreviated to which of the following?

Accepted Answer

2001:DB8::1

Answer

Leading zeros in each group can be removed and consecutive all-zero groups replaced with :: once, yielding 2001:DB8::1.

Question 4

Which command verifies the IPv6 address configured on a Cisco router interface?

Accepted Answer

show ipv6 interface brief

Answer

The 'show ipv6 interface brief' command displays IPv6 addresses and status for all interfaces.

Question 5

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

The network address is .64 and the broadcast is .127, so valid hosts are .65 through .126.

Cisco CCNA Practice Test