AP Cyber Security - Chapter 2 OSI Flashcards
What does OSI stand for?
Open System Interconnection Reference Model
What does OSI describe?
Layered communications, computer network protocol, and transmission design.
OSI Layers
Physical
Data Link
Network
Transport
Session
Presentation
Application
Physical Layer
Data transmitted using cables or wireless media
Data Link Layer
Transmission of data on the same logical network using MAC addresses.
Organizes bits from the physical layer into frames
Network Layer
Transmission of data around a network of networks using network and host IDs.
Packets are given a destination IP address and forwarded to the destination network
Transport Layer
Tracks communication between applications on source and destination hosts.
Reassembles segments into application data
Session Layer
Establishes and manages the connections between applications
Presentation Layer
Delivers data across network connections
Application Layer
Interacts directly with end-users software applications for network service
Devices used in the Physical layer
Coax and fiber cables, hubs and repeaters, modem, transceiver
Devices used in the Data Link layer
NIC, bridge, switch, wireless access point
Devices used in the Network layer
Router, IP, ACL, Basic Firewall
Devices used in the Transport layer
Multilayer switches, advanced firewalls,
intrusion detection systems (IDSs)
Which OSI layers are in the APPLICATION layer in TCP/IP model?
Application, Presentation, Session
