2.6 - VLANS and VPNS Flashcards
What is a LAN?
A LAN is a Local Area Network, typically defined as a group of devices within the same broadcast domain.
What is a VLAN?
A VLAN (Virtual Local Area Network) is a method of virtualizing a LAN by grouping devices in the same broadcast domain across the same physical device, such as a switch.
Why would you use VLANs?
VLANs are used to logically separate networks on the same physical device, reducing costs and increasing efficiency by avoiding the need for multiple switches.
What is the benefit of using a single switch for multiple VLANs?
Using a single switch for multiple VLANs reduces the cost and complexity of managing separate physical switches for each network.
What is a VPN?
A VPN (Virtual Private Network) is a technology that allows secure transmission of data across a public network by encrypting the data.
What device is typically used in a VPN setup?
A VPN concentrator, which can be a standalone device or integrated into a firewall, is used to manage VPN connections and encryption.
How does a VPN protect your data on public networks?
A VPN encrypts data sent from your device to the VPN concentrator, making it unreadable to anyone who intercepts it during transmission.
What happens when data is sent over a VPN?
The data is encrypted on the sender’s device, sent through an encrypted tunnel to the VPN concentrator, decrypted by the concentrator, and then transmitted to the corporate network or destination.
What are common uses of VPNs?
VPNs are commonly used to secure data when accessing corporate networks remotely or when using public Wi-Fi networks.
How are VLANs assigned on a switch?
VLANs are assigned by configuring specific ports on the switch to belong to a particular VLAN, which is usually identified by a VLAN number.
What are the inefficiencies of using separate switches for different networks?
Using separate switches leads to increased costs, duplication of resources, and underutilization of switch ports.
What does a VPN concentrator do?
A VPN concentrator handles the encryption and decryption of data in a VPN connection, managing secure communications between remote users and a corporate network.
How does a VPN work in a coffee shop scenario?
In a coffee shop scenario, a VPN encrypts data from your laptop, sends it through an encrypted tunnel to the VPN concentrator, where it is decrypted and sent to the corporate network.
Why might VLANs be used for security?
VLANs can separate different devices or networks on the same switch, reducing the risk of unauthorized access between them.
What is a common feature of modern operating systems related to VPNs?
Most modern operating systems come with a built-in VPN client or support for VPN software.
