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Networks and Telecommunications - Coggle Diagram
Networks and Telecommunications
OSI Reference Model
model of networking with stacked layers that can be used to document, build and use a network
LAYERS
LAYER 4 TRANSPORT
END-TO-END MAINTENANCE
LAYER 3 NETWORK
WAN DELIVERY
LAYER 5 SESSION
PROCESS-TO-PROCESS COMMUNICATION
LAYER 2 DATA LINK
LAN DELIVERY
LAYER 6 PRESENTATION
ENCRYPTION
LAYER 1 PHYSICAL
SIGNALING
LAYER 7 APPLICATION
USER INTERFACE
Network Types
WIDE AREA NETWORKS
LOCAL AREA NETWORKS
ETHERNET NETWORKS
Network Protocols
TCP/IP
suite of protocols that govern all activity across the internet at network/transport layers
UDP
Use Datagram Protocol
works along TCP to support upper level protocols
Security Risks
EAVESDROPPING
violating confidentiality
DoS
flooding a network with traffic / shutting down a single point of failure
RECONNAISSANCE
attacker gaining info about a network for future attack
Wireless Networking
WIRELESS ACCESS POINT
radio sending/receiving network info over the air between wireless devices and the wired network
Security Controls
VPN over wireless
Wireless Encryption
SSID broadcast
MAC address filtering
Network Security Defense tools
VPNs
allow users to connect securely to network from remote locations
NETWORK ACCESS CONTROL
adds more security requirements before allowing a device to connect to the network
FIREWALLS
controls flow of traffic by preventing unauthorized network traffic from entering or leaving a segment of a network