networks

Internet

layers

router

PS

TCP/IP

ISP

protocol

application

network

link

packets

CS

end2end

cable

WiFi

DSL

Broadband

End2end circuit

end2end per packet

firewall

LAN

WAN

Latency

Bandwidth

transport

topologies

bus

star

mesh

ethical hackiung

penetration testing

access control

physical security

malware

viruses

trojan

worms

ransomware

key loggers