CCST IP Addressing & Subnetting 3

Question 1

A company needs 5 subnets with at least 25 hosts each from 192.168.1.0/24. Which subnet mask satisfies this?

Accepted Answer

255.255.255.224 (/27)

Answer

/27 provides 30 usable hosts per subnet and allows 8 subnets from a /24, meeting both requirements.

Question 2

What is the purpose of the loopback address 127.0.0.1?

Accepted Answer

To test the local TCP/IP stack without sending traffic on the network

Answer

127.0.0.1 is the loopback address used to test that the local IP stack is functioning correctly.

Question 3

Which subnet does the host 192.168.5.200/28 belong to?

Accepted Answer

192.168.5.192

Answer

/28 uses 16-address blocks; 192 is the nearest multiple of 16 ≤ 200, so the network is 192.168.5.192.

Question 4

In IPv4 subnetting, what does the term 'magic number' refer to?

Accepted Answer

The block size used to calculate subnet boundaries

Answer

The magic number (256 minus the interesting octet of the subnet mask) gives the block size for calculating subnet boundaries.

Question 5

How many subnets are created when you borrow 3 bits from the host portion of a Class C network?

Accepted Answer

8

Answer

Borrowing 3 bits creates 2^3 = 8 subnets.

(CCST) Cisco Certified Support Technician Networking Practice Test