2.3 IPv4 Design/Troubleshooting

IPv4 Design and Troubleshooting

Subnet Design

1. An IP subnetting design effort is under way at a company. So far, the senior engineer has decided to use Class B network 172.23.0.0. The design calls for 100 subnets, with the largest subnet needing 500 hosts. Management requires that the design accommodate 50 percent growth in the number of subnets and the size of the largest subnet. The requirements also state that a single mask must be used throughout the Class B network. How many masks meet the requirements?

a. 0 b. 1 c. 2 d. 3+

2. An IP subnetting design requires 200 subnets and 120 hosts/subnet for the largest subnets, and requires that a single mask be used throughout the one private IP network that will be used. The design also requires planning for 20 percent growth in the number of subnets and number of hosts/subnet in the largest subnet. Which of the following answers lists a private IP network and mask that, if chosen, would meet the requirements?

a. 10.0.0.0/25 b. 10.0.0.0/22 c. 172.16.0.0/23 d. 192.168.7.0/24

3. An engineer has planned to use Class B network 172.19.0.0 and a single subnet mask throughout the network. The answers list the masks considered by the engineer. Choose the mask that, among the answers, supplies the largest number of hosts per subnet, while also supplying enough subnet bits to support 1000 subnets.

a. 255.255.255.0 b. /26 c. 255.255.252.0 d. /28

4. An engineer has calculated the list of subnet IDs, in consecutive order, for network 172.30.0.0, assuming that the /22 mask is used throughout the network. Which of the following are true? (Choose two answers.)

a. Any two consecutive subnet IDs differ by a value of 22 in the third octet. b. Any two consecutive subnet IDs differ by a value of 16 in the fourth octet. c. The list contains 64 subnet IDs. d. The last subnet ID is 172.30.252.0.

5. Which of the following are valid subnet IDs for network 192.168.9.0 using mask /29, assuming that mask /29 is used throughout the network?

a. 192.168.9.144 b. 192.168.9.58 c. 192.168.9.242 d. 192.168.9.9

6. Which of the following is not a valid subnet ID for network 172.19.0.0 using mask /24, assuming that mask /24 is used throughout the network?

a. 172.19.0.0 b. 172.19.1.0 c. 172.19.255.0 d. 172.19.0.16

Variable Length Subnet Masks

1. Which of the following routing protocols support VLSM? (Choose three answers.)

a. RIPv1 b. RIPv2 c. EIGRP d. OSPF

2. What does the acronym VLSM stand for?

a. Variable-length subnet mask b. Very long subnet mask c. Vociferous longitudinal subnet mask d. Vector-length subnet mask e. Vector loop subnet mask

3. R1 has configured interface Fa0/0 with the ip address 10.5.48.1 255.255.240.0 command. Which of the following subnets, when configured on another interface on R1, would not be considered an overlapping VLSM subnet?

a. 10.5.0.0 255.255.240.0 b. 10.4.0.0 255.254.0.0 c. 10.5.32.0 255.255.224.0 d. 10.5.0.0 255.255.128.0

4. R4 has a connected route for 172.16.8.0/22. Which of the following answers lists a subnet that overlaps with this subnet?

a. 172.16.0.0/21 b. 172.16.6.0/23 c. 172.16.16.0/20 d. 172.16.11.0/25

5. A design already includes subnets 192.168.1.0/26, 192.168.1.128/30, and 192.168.1.160/29. Which of the following subnets is the numerically lowest subnet ID that could be added to the design, if you wanted to add a subnet that uses a /28 mask?

a. 192.168.1.144/28 b. 192.168.1.112/28 c. 192.168.1.64/28 d. 192.168.1.80/28 e. 192.168.1.96/28