Chapter 1: OSI Model Flashcards
What is the Open Systems Interconnection (OSI) reference model?
It is an architectural diagram of network communications.
What is the mnemonic to remember the different layers of the OSI?
“Please Do Not Throw Sausage Pizza Away.”
What is layer 7 of the OSI?
Application.
What is layer 6 of the OSI?
Presentation.
What is layer 5 of the OSI?
Session
What is layer 4 of the OSI?
Transportation.
What is layer 3 of the OSI?
Network.
What is layer 2 of the OSI?
Data Link.
What is layer 1 of the OSI?
Physical
What are the main functions of the Application Layer?
File, print, messaging, and other services.
What are the main functions of the Presentation Layer?
Syntax translation.
What are the main functions of the Session Layer?
Dialog control, dialog separation.
What are the main functions of the Transport Layer?
Data segmentation, packet acknowledgment, error detection and correction, flow control, and port identification.
What are the main functions of the Network Layer?
Addressing, routing, error detection, and protocol identification.
What are the main functions of the Data Link Layer?
Framing, media access control, protocol identification.
What are the main functions of the Physical Layer?
Network interface hardware, binary signaling.
What are the protocols of the Application Layer?
DNS, FTP, HTTP, POP3, SMTP, SNMP, DHCP.
What are the protocols of the Transport Layer?
TCP, UDP.
What are the protocols of the Network Layer?
IP, IPv4, IPv6, ICMP.
What are the protocols of the Data Link Layer?
IEEE 802.3 (Ethernet), IEEE 802.11 (Wi-Fi).
What are the protocols of the Physical Layer?
Twisted pair, fiber-optic, Wi-Fi.
LANs today nearly always run Ethernet or Wi-Fi at which OSI layers?
The physical and data link layers.
IP is run at which OSI layer?
The network layer.
TCP is run at which OSI layer?
Transportation
How many layers does the OSI reference model have?
Seven.
How many layers does the TCP\IP model have?
Four.
