DRAG DROP
You are configuring a test network. The test network contains a subnet named LAN1. LAN1 uses the
network ID of 10.10.1.0/27.
You plan to add a new subnet named LAN2 to the test network.
LAN1 and LAN2 will be connected by a router.
You need to identify a valid network ID for LAN2 that meets the following requirements:
Ensures that hosts on LAN2 can communicate with hosts on LAN1.
Supports at least 100 IPv4 hosts.
Uses only private IP addresses.
Which network ID should you use?
To answer, drag the appropriate network ID and subnet mask to the correct location in the answer
area.
Answer: 
Explanation:
The Subnet Mask specifies which bits of the IP address identify the host system and which bits
identify the network where the host system resides.
References:
Exam Ref: 70-410: Installing and Configuring Windows Server 2012 R2, Chapter4: Deploying and
configuring core network services, Objective 4.1: Configure IPv4 and IPv6 addressing, p.192, 196
10.10.1.128 and 255.255.255.128
Getting rid of the wrong answers:
10.10.1.0 and 10.10.1.16 are both addresses of hosts on the 10.10.1.0/27 network
Subnet masks 255.255.0.0 and 255.255.255.0 will allow the whatever network is chosen to use IP addresses that are hosts on the 10.10.1.0/27 network. 255.255.255.192 will allow for a maximum of 62 hosts (2^6 -2), so the subnet mask is 255.255.255.128 (which gives 2^7 -2 = 126 hosts)
The address is therefore 10.10.1.128, as 10.10.1.192 is a host on the network 10.10.1.128/26 rather than a network (hint: use bitwise AND with the subnet mask discovered above to verify)
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