A network administrator has borrowed 3 bits from the 10.20.0.0/25 network to create subnets. The administrator then decided to use the first subnet for point-to-point serial WAN connections each requiring two addresses. How many WAN connections can the administrator address using only the first subnet if he is using VLSM?
- 1
- 2
- 4
- 16
- 32
- 64
- 128
Explanation: By borrowing 3 bits from the network portion of the original network, the administrator has now assigned 28 bits to the network, leaving only 4 host bits. Each WAN link requires two addresses, but each subnet has two unusable addresses, meaning that each created subnet must have four available hosts. To create subnets with four hosts means that 2 host bits must be available, allowing the administrator to borrow 2 additional bits, creating four subnets each with four hosts.
Exam with this question: CCNA 1 ITNv6 Chapter 8: Check Your Understanding
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