ITPEC FE Morning April 2018 Question 45

To reduce network traffic — a VLAN splits one physical LAN into several logical broadcast domains.

A switch configured with VLANs groups its ports (or devices) into separate logical LANs regardless of where they are physically connected. Broadcast frames, such as ARP requests, reach only the members of the same VLAN, so unnecessary traffic does not flood the whole network. VLANs also group users by department and separate them for security; traffic between VLANs goes through a router or layer 3 switch.

Answer (b)

Why not others:

• •(a) — IP addresses are assigned automatically by DHCP or set manually; a VLAN does not provide them
• •(c) — secure remote access to the intranet across a public network is the job of a VPN
• •(d) — virtual memory is an operating-system technique that uses disk space as an extension of main memory; it has nothing to do with LANs

Key rule: A VLAN divides a LAN logically inside the switches (smaller broadcast domains); a VPN builds a private tunnel across a public network.

Networks · AI-written, may contain errors