Answer:
17. A Variable Length Subnet Mask (VLSM) is a technique used to allocate IP addresses to subnets of different sizes. It allows for more efficient use of IP address space by creating subnets with different sizes, rather than using a fixed subnet mask. VLSM is created by dividing the network into smaller subnets with different subnet masks, depending on the number of hosts required in each subnet.
18. There are several reasons to use VLANs, including:
Security: VLANs can be used to isolate traffic and prevent unauthorized access to sensitive data.
Performance: VLANs can be used to segment traffic and reduce network congestion, improving performance
Management: VLANs can simplify network management by grouping devices with similar functions or requirements
Flexibility: VLANs can be used to easily move devices between physical locations without changing their IP addresses
Step-by-step explanation: