IP Subnetting practice exam for Cisco CCNA certification

The Cisco CCNA certification requires that you are completely familiar with IP subnetting. CCNA certification practice exams are a great way to prepare for the Cisco CCNA certification and for jobs that will require you to install, maintain, and configure IP subnetting on Cisco routers and switches. This free practice exam will help you to know the Cisco IP subnetting well enough that you can productively apply your Cisco IP subnet knowledge to any network. The Cisco CCNA certification is an entry level certification which will equip you for the type of work that requires extensive use of IP subnets.

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Answer all questions.
Your score will be calculated out of a total of 25 questions even if they are unanswered.
Unanswered questions will be marked wrong.
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Your Email Address:  Your test results will be emailed to you.
1) Which of the following is not a benefit of subnetting?
  1. Reduced network traffic.
  2. Better network performance.
  3. Simplified management.
  4. Smaller collision domains.
 
2) Given the formula 2n-2=[Number of subnets]; Why would the formula require subtracting 2 from the exponent?
  1. The number of address' with all zeros and all ones are 2, and are not available for use as host address'.
  2. The number of address' with all zeros and all ones are 2, and are available for use as host address'.
  3. The first network contains an address with all zeros, and is not available for use as a network address.The last network contains an address with all ones, and is not available for use as a network address.
  4. The first network contains an address with all zeros, and is available for use as a network address.The last network contains an address with all ones, and is available for use as a network address.
 
3) Given the formula 2n-2=[Number of hosts]; Why would the formula require subtracting 2 from the exponent?
  1. The number of address' with all zeros and all ones are 2, and are not available for use as host address'.
  2. The number of address' with all zeros and all ones are 2, and are available for use as host address
  3. The first network contains an address with all zeros, and is not available for use as a network address.The last network contains an address with all ones, and is not available for use as a network address.
  4. The first network contains an address with all zeros, and is available for use as a network address.The last network contains an address with all ones, and is available for use as a network address.
 
4) Why is it not possible to use only one bit for subnetting a classful network address?
  1. Using one bit would only permit two hosts, the address' of which would be the subnet and broadcast address for the subnet. These can be assigned to hosts.
  2. Using only one bit would divide a network into only two subnets. Each subnet would contain an address with all zeros or all ones. These address' would render the entire subnet(s) invalid.
  3. Using only one bit would divide a network into only two subnets. Each subnet would contain an address with all zeros or all ones. These address' would render all the other subnet(s) invalid.
 
5) Why is it not possible in a subnet mask, to leave only one host bit to define the number of hosts on a subnet?
  1. Using one bit would only permit two hosts, the address' of which would be the subnet and broadcast address for the subnet. These can be assigned to hosts.
  2. Using only one bit would divide a network into only two subnets. Each subnet would contain an address with all zeros or all ones. These address' would render the entire subnet(s) invalid.
  3. Using one bit would only permit two hosts, the address' of which would be the subnet and broadcast address for the subnet. These cannot be assigned to hosts.
 
6) How many subnets are available for use on network 192.168.5.0 with subnet mask 255.255.255.252?
  1. 2.
  2. 4.
  3. 64.
  4. 62.
 
7) Using the previous question details, what is the broadcast address of the last available subnet?
  1. 192.168.5.251.
  2. 192.168.5.252.
  3. 192.168.5.254.
  4. 192.168.5.191.
 
8) How many subnets are available on network 192.168.224.0 using subnet mask 255.255.255.224.
  1. 30.
  2. 32.
  3. 6.
  4. 8.
 
9) Using the previous question details, What is the subnet address of the third available subnetwork?
  1. 192.168.224.63.
  2. 192.168.224.64.
  3. 192.168.224.95.
  4. 192.168.224.96.
 
10) How many host address' are available for each subnet under network 192.168.60.0 using subnet mask 255.255.255.240?
  1. 16.
  2. 14.
  3. 8.
  4. 6.
 
11) Using the previous question details, What is the last host address of the fifth available subnetwork?
     
  1. 192.168.60.94.
  2. 192.168.60.95.
  3. 192.168.60.78.
  4. 192.168.60.79.
 
12) Class B networks have 16 bits available for host addressing, How many bits are available for subnetting?
  1. 16.
  2. 14.
  3. 8.
  4. 6.
 
13) How many subnets are available on network 172.16.0.0 using subnet mask 255.255.192.0?
     
  1. 768.
  2. 32,768.
  3. 16,384.
  4. 8,192.
 
14) Using the previous question details, What is the broadcast address of the first  available subnetwork?
     
  1. 172.16.64.0
  2. 172.16.63.255.
  3. 172.16.128.0.
  4. 172.16.127.255.
 
15) How many subnets are available on network 172.16.0.0 using subnet mask 255.255.248.0?
  1. 30.
  2. 32.
  3. 8.
  4. 6.
 
16) Using the previous question details, What is the network address of the twenty seventh available subnetwork?
  1. 172.16.248.0.
  2. 172.16.216.0.
  3. 172.16.224.0.
  4. 172.16.232.0.
 
17) How many host address' are available for each subnet under network 172.16.0.0 using subnet mask 255.255.240.0?
  1. 16.
  2. 14.
  3. 32.
  4. 30.
 
18) Using the previous question details, What is the last host address of the fourteenth available subnetwork?
  1. 172.16.239.255
  2. 172.16.239.254.
  3. 172.16.31.254.
  4. 172.16.31.255.
 
19) Class A networks provide for 24 bits to use for host addressing. How many bits are available for subnetting?
  1. 16.
  2. 24.
  3. 23.
  4. 22.
 
20) How many subnets are available on network 10.0.0.0 using subnet mask 255.255.224.0?
     
  1. 2046.
  2. 2048.
  3. 1022.
  4. 1024.
 
21) How many host address' are available for each subnet under network 10.0.0.0 using subnet mask 255.255.224.0?
  1. 32768.
  2. 32766.
  3. 8192.
  4. 8190.
 
22) How many host address' are available for all valid subnets combined under network 10.0.0.0 using subnet mask 255.255.224.0?
  1. 16,773,120.
  2. 16,760,832.
  3. 16,756,740.
  4. 33,486,852.
 
23) How many valid broadcast address' are on network 10.0.0.0 when using subnet mask 255.255.252.0
  1. 16,382.
  2. 16,384.
  3. 16,768
  4. 16,766.
 
24) How many invalid (wasted) host address' are on network 172.16.0.0 when masked using 255.255.192.0?
  1. 32,768.
  2. 32,764.
  3. 16,384.
  4. 16,382.
 
25) What is the second host address on the thirty seventh available subnet of network 10.0.0.0 using subnet mask 255.252.0.0?
  1. 10.153.0.0.
  2. 10.150.0.0.
  3. 10.148.0.0.
  4. 10.149.0.0.

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