Net+ Mod 8 Subnetting and VLAN Concepts Overview

Subnet Mask

A number that divides an IP address into network and host portions

CIDR Notation

A shorthand for subnet masks using a slash and number.

Subnetting

Dividing a network into smaller networks

Equal Size Subnets

Subnets that have the same number of hosts

VLSM (Variable Length Subnet Masking)

Using different subnet masks in the same network

VLAN (Virtual Local Area Network)

A virtual separation of network devices, regardless of location.

VLAN Tagging

Adding information to frames to identify VLAN membership

VLAN Trunking

Carrying multiple VLANs over a single network link.

VLAN ID

A unique number that identifies a VLAN

Native VLAN

The VLAN assigned to untagged traffic on a trunk port. VLAN

Network Segmentation

Splitting a network into smaller parts to improve performance and security

Benefits of Segmentation

Better security, reduced congestion, and improved performance

Router on a Stick

A router using one physical interface to route between VLANs

Subnet ID

The network portion of an IP address

Broadcast Address

The IP address used to communicate with all hosts on a subnet.

Host Range

The range of usable IP addresses within a subnet

Slash Notation (الترميز بشرطة مائلة)

Another term for CIDR, showing the subnet mask length. مصطلح آخر لـ CIDR، يظهر طول قناع الشبكة الفرعية.

Default Gateway

A device that routes traffic from a local network to other networks

VLAN Management

The process of setting up and maintaining VLANs on a network

IP Address

A unique identifier for a device on a network.