CCNA Day 3 - OSI Model, TCP/IP Suite

Open Systems Interconnection

What does ‘OSI’ stand for?

7 layers

How many layers are in the OSI model?

Layer 7 - Application

Which layer of the OSI model interacts with software applications on a computer?

Layer 7 - Application

Which layer of the OSI model includes HTTP and HTTPs?

Layer 7 - Application

Which layer of the OSI model identifies communication partners and synchronizes communication?

Encapsulation

What is the process of adding additional headers and trailers to data before it is sent over the network called?

De-encapsulation

What is the process of removing headers and trailers from data received over a network called?

Same-layer interaction

Interaction between the same OSI layer on different devices

Adjacent-layer interaction

Interaction between the different OSI layers on the same device

Layer 6 - Presentation

Which layer of the OSI model translates between data formats?

Layer 5 - Session

Which layer of the OSI model establishes, manages, and terminates connections between the local and remote applications?

Layer 4 - Transport

Which layer of the OSI model segments and reassembles data for communications between end hosts?

Layer 4 - Transport

Which layer of the OSI model provides host-to-host communication?

Layer 7 - Application

Which layer of the OSI model provides process-to-process communication?

Segment

Layer 4 PDU

Layer 3 - Network

Which layer of the OSI model provides path selection between source and destination?

Layer 3 - Network

What layer of the OSI model do routers operate at?

Layer 3 - Network

Which layer of the OSI model provides logical addressing (IP Addresses)?

Layer 3 - Network

Which layer of the OSI model provides connectivity to end hosts on different networks?

Packet

Layer 3 PDU

Frame

Layer 2 PDU

Layer 2 - Data Link

Which layer of the OSI model provides node-to-node connectivity?

Layer 2 - Data Link

Which layer of the OSI model detects and corrects Physical Layer errors?

Layer 2 - Data Link

What layer of the OSI model do switches operate at?

Layer 1 - Physical

Which layer of the OSI model defines physical characteristics of the medium used to transfer data between devices?

Bits

Layer 1 PDU

Physical

OSI Model Layer 1

Data Link

OSI Model Layer 2

Network

OSI Model Layer 3

Transport

OSI Model Layer 4

Session

OSI Model Layer 5

Presentation

OSI Model Layer 6

Application

OSI Model Layer 7

TCP/IP Suite

Which networking model was developed by the US DoD?

TCP/IP

Which networking model is in use in modern networks?

Application, Presentation, Session

What are the equivalent OSI model layer(s) of the TCP/IP Application Layer?

Transport

What are the equivalent OSI model layer(s) of the TCP/IP Transport Layer?

Network

What are the equivalent OSI model layer(s) of the TCP/IP Internet Layer?

Data Link, Physical

What are the equivalent OSI model layer(s) of the TCP/IP Link Layer?