Networking - Subnetting

Exercise :: Subnetting - Subnetting

  • Subnetting - Subnetting
11. 

You need to configure a server that is on the subnet 192.168.19.24/29. The router has the first available host address. Which of the following should you assign to the server?

A. 192.168.19.0 255.255.255.0
B. 192.168.19.33 255.255.255.240
C. 192.168.19.26 255.255.255.248
D. 192.168.19.31 255.255.255.248

Answer: Option C

Explanation:

A /29 is 255.255.255.248, which is a block size of 8 in the fourth octet. The subnets are 0, 8, 16, 24, 32, 40, etc. 192.168.19.24 is the 24 subnet, and since 32 is the next subnet, the broadcast address for the 24 subnet is 31. 192.168.19.26 is the only correct answer.

12. 

You have an interface on a router with the IP address of 192.168.192.10/29. What is the broadcast address the hosts will use on this LAN?

A. 192.168.192.15
B. 192.168.192.31
C. 192.168.192.63
D. 192.168.192.127

Answer: Option A

Explanation:

A /29 (255.255.255.248) has a block size of 8 in the fourth octet. This means the subnets are 0, 8, 16, 24, etc. 10 is in the 8 subnet. The next subnet is 16, so 15 is the broadcast address.

13. 

You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?

A. 172.16.17.1 255.255.255.252
B. 172.16.0.1 255.255.240.0
C. 172.16.20.1 255.255.254.0
D. 172.16.18.255 255.255.252.0

Answer: Option D

Explanation:

A Class B network ID with a /22 mask is 255.255.252.0, with a block size of 4 in the third octet. The network address in the question is in subnet 172.16.16.0 with a broadcast address of 172.16.19.255. Only option E even has the correct subnet mask listed, and 172.16.18.255 is a valid host.

14. 

On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?

A. /27
B. /28
C. /29
D. /30

Answer: Option D

Explanation:

A point-to-point link uses only two hosts. A /30, or 255.255.255.252, mask provides two hosts per subnet.

15. 

To test the IP stack on your local host, which IP address would you ping?

A. 127.0.0.0
B. 1.0.0.127
C. 127.0.0.1
D. 127.0.0.255

Answer: Option C

Explanation:

To test the local stack on your host, ping the loopback interface of 127.0.0.1.