CCST IP Addressing & Subnetting 2

Question 1

What is the subnet mask in CIDR notation for the address 192.168.10.0/26?

Accepted Answer

255.255.255.192

Answer

/26 means 26 bits are set to 1, producing a subnet mask of 255.255.255.192.

Question 2

How many usable host addresses are available in a /29 subnet?

Accepted Answer

6

Answer

A /29 subnet has 2^3 = 8 addresses total, minus 2 (network and broadcast) = 6 usable hosts.

Question 3

Which IP address class uses the default subnet mask 255.255.0.0?

Accepted Answer

Class B

Answer

Class B addresses (128.0.0.0–191.255.255.255) use the default subnet mask 255.255.0.0.

Question 4

What is the broadcast address for the subnet 10.0.0.64/26?

Accepted Answer

10.0.0.127

Answer

The /26 block starting at .64 spans .64–.127, so .127 is the broadcast address.

Question 5

A host has the IP address 172.16.50.100 with a /20 mask. What is the network address?

Accepted Answer

172.16.48.0

Answer

/20 increments in blocks of 16 in the third octet; 48 is the nearest multiple of 16 below 50.

(CCST) Cisco Certified Support Technician Networking Practice Test