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Flip to reveal answersWhat is network segmentation and why is it done?
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Question
What is network segmentation and why is it done?
Answer
Splitting one network into smaller separate ones. For performance, because less traffic competes on each segment, and for security, because a break-in or infection is contained where it started.
Question
What is subnetting?
Answer
Dividing the IP address range into smaller ranges, each its own network. Traffic between subnets must pass through a router, which is where rules can be enforced.
Question
What is a VLAN?
Answer
A logical grouping of devices configured on the switch, regardless of where each device is plugged in. Two machines in one room can be on different VLANs, and moving someone between groups is a setting rather than re-cabling.
Question
How does segmentation reduce congestion?
Answer
Broadcast traffic reaches only its own segment rather than every device, so on a network split six ways each device sees roughly a sixth as much — the cabling carries useful work instead of noise.
Question
What does segmentation cost an organisation?
Answer
It must be designed and maintained: wrong rules block legitimate work and forgotten rules leave gaps. Each crossing between segments also adds a routing step, and so a little delay.
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Topic 2.2 hub
Network architecture
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