## Subnetting problems

• 1. Which two statements describe the IP address 10.16.3.65/23?

1. The subnet address is 10.16.3.0 255.255.254.0.
2. The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
3. The last valid host address in the subnet is 10.16.2.254 255.255.254.0.

• Options
• A. 1 and 3
• B. 2 and 4
• C. 1, 2 and 4
• D. 2, 3 and 4
• 2. Using the following illustration, what would be the IP address of E0 if you were using the eighth subnet? The network ID is 192.168.10.0/28 and you need to use the last available IP address in the range. The zero subnet should not be considered valid for this question.

• Options
• A. 192.168.10.142
• B. 192.168.10.66
• C. 192.168.100.254
• D. 192.168.10.143
• E. 192.168.10.126
• 3. The network address of 172.16.0.0/19 provides how many subnets and hosts?

• Options
• A. 7 subnets, 30 hosts each
• B. 8 subnets, 8,190 hosts each
• C. 8 subnets, 2,046 hosts each
• D. 7 subnets, 2,046 hosts each
• 4. Your router has the following IP address on Ethernet0: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router?

1. 172.16.1.100
2. 172.16.1.198
3. 172.16.2.255
4. 172.16.3.0

• Options
• A. 1 only
• B. 2 and 3 only
• C. 3 and 4 only
• D. None of the above
• 5. You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?

• Options
• A. 6
• B. 8
• C. 30
• D. 32
• 6. To test the IP stack on your local host, which IP address would you ping?

• Options
• A. 127.0.0.0
• B. 1.0.0.127
• C. 127.0.0.1
• D. 127.0.0.255
• 7. What is the subnetwork address for a host with the IP address 200.10.5.68/28?

• Options
• A. 200.10.5.56
• B. 200.10.5.32
• C. 200.10.5.64
• D. 200.10.5.0
• 8. What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

• Options
• A. 14
• B. 15
• C. 16
• D. 30
• 9. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

• Options
• A. 255.255.255.192
• B. 255.255.255.224
• C. 255.255.255.240
• D. 255.255.255.248
• 10. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?

• Options
• A. Router(config)#ip classless
• B. Router(config)#no ip classful
• C. Router(config)#ip unnumbered
• D. Router(config)#ip subnet-zero