CCNA: Cisco Certified Network Associate — Question 376

A network engineer must configure two new subnets using the address block 10.70.128.0/19 to meet these requirements:
✑ The first subnet must support 24 hosts.
✑ The second subnet must support 472 hosts.
✑ Both subnets must use the longest subnet mask possible from the address block.
Which two configurations must be used to configure the new subnets and meet a requirement to use the first available address in each subnet for the router interfaces? (Choose two.)

Answer options

• A. interface vlan 1148 ip address 10.70.148.1 255.255.254.0
• B. interface vlan 3002 ip address 10.70.147.17 255.255.255.224
• C. interface vlan 4722 ip address 10.70.133.17 255.255.255.192
• D. interface vlan 1234 ip address 10.70.159.1 255.255.254.0
• E. interface vlan 155 ip address 10.70.155.65 255.255.255.224

Correct answer: A, E

Explanation

The correct answers are A and E. Option A uses the subnet mask 255.255.254.0, allowing for 510 usable addresses, which accommodates the requirement for the first subnet of 24 hosts. Option E, with the subnet mask 255.255.255.224, provides 30 usable addresses, which is also sufficient for the second subnet's requirement of 472 hosts. The other options do not meet the host requirements or use incorrect subnet masks.