Lesson 1 | Network Devices

Computer Network

is a digital telecommunications network

that allows nodes to share resources.

Client

is a device that accesses a service made available by a server.

Server

is a device that provides functions or services for clients.

Switches

Provide connectivity to hosts within the same LAN (Local Area Network) or used to forward data within the

Have many network interfaces/ports for end hosts to connect to (usually 24+)

Router

-have fewer network interfaces than switches

-used to provide connectivity between LANs

Firewalls

• Monitor and control network traffic based on configured rules.

• Can be placed ”inside “ or “Outside “ the network

• Are known as “ Next-Generation Firewalls” when they include more modern and

advanced filtering capabilities.

ASA (Adaptive Security Appliance)

is CISCO classic firewall, but modern ASAs include modern features so-called “ next generation firewalls” including IPS (Intrusion Prevention System

Network Firewalls

are hardware devices that filter traffic between

networks.

Host-based firewalls

Are software applications that filter traffic

entering and exiting a host machine, like a PC