CCST Subnetting and CIDR Notation 2

Question 1

A company needs 5 subnets with at least 25 hosts each. Which subnet mask is most appropriate?

Accepted Answer

/27

Answer

A /27 subnet provides 30 usable host addresses (2^5-2), which meets the requirement of at least 25 hosts per subnet.

Question 2

What is the total number of IP addresses (including network and broadcast) in a /29 subnet?

Accepted Answer

8

Answer

A /29 subnet has 3 host bits (32-29=3), giving 2^3=8 total addresses including the network and broadcast addresses.

Question 3

Which statement best describes Variable Length Subnet Masking (VLSM)?

Accepted Answer

Different subnets can use different prefix lengths based on requirements

Answer

VLSM allows network designers to allocate subnets of different sizes, using the appropriate prefix length for each subnet based on the number of hosts needed.

Question 4

What is the dotted-decimal subnet mask for the /20 prefix length?

Accepted Answer

255.255.240.0

Answer

A /20 mask has 20 ones: the first two octets are 255.255, and the third octet has 4 ones (11110000 = 240), giving 255.255.240.0.

Question 5

How many subnets can be created by borrowing 3 bits from the host portion of a subnet?

Accepted Answer

8

Answer

Borrowing 3 bits creates 2^3=8 subnets, as each additional borrowed bit doubles the number of available subnets.

(CCST) Cisco Certified Support Technician Practice Test

(CCST) Cisco Certified Support Technician Practice Test

CCST Subnetting and CIDR Notation 2