OSI model and Tcp\IP model

Question 1

OSI Layers what is the order

Answer 1

1. physical 2. data link 3. network 4. Transport 5. Session 6. Presentation 7. Application
   Please, Do, Not, Throw, Sausage, Pizza, Away

Question 2

OSI model or OSI stack open systems interconnection

Answer 2

OSI model 7 layers developed in 1977 by the international organization for standardization (ISO)

Question 3

Physical layer

Answer 3

layer 1
where transmission of bits across the network occurs and is focused on the physical and electrical characteristics of the network.
EX: Cables, wifi, bluetooth, hubs, wap, media converters.

Question 4

Data Link

Answer 4

Layer 2
Packages data into frames and transmits those frames on the network, performing error detection/correction, uniquely identifying network devices with an address (MAC) and providing flow control.
EX: Network interface card, bridges, switches, MAC addresses

Question 5

Network Layer

Answer 5

Layer 3 
Forwards traffic (routing) with logical address (IPv4 or IPv6)

Question 6

Transport

Answer 6

Layer 4

Dividing line between upper and lower layers of the OSI model

Question 7

Session

Answer 7

Layer 5

Think of a session as a conversation that must be kept from others to prevent intermingling data.

Question 8

Presentation

Answer 8

Layer 6

Responsible for formatting the data exchanged and securing the data with proper encryption.

Question 9

Application

Answer 9

Layer 7
Provides application-level services and is where the users communicate with the computer.
EX: email, web browsing, domain name, file transfer protocol FTP, Remote access.

Question 10

4 Types of info in OSI

Answer 10

Data layers 7,6,5
Segments layer 4 
Packets layer 3
frames layer 2
Bits 1

Question 11

TCP/IP Model/DOD model

Answer 11

alternative to the OSI model for network designers since it’s based on TCP/IP and only 4 layers

Question 12

Network Interface

Answer 12

Layer 1
Concerned with physical and electrical characteristics. It describes how to transmit bits across the network and determines how the interface uses network medium.

Question 13

Internet

Answer 13

Layer 2

Packages data into IP diagrams and routes these IP diagrams between hosts across the network.

Question 14

Transport

Answer 14

Layer 3
Provides communication session management between hosts and defines level of service and status of connection used for transport.

Question 15

Application

Answer 15

Layer 4
Defines TCP/IP application protocols and how programs interface with the transport layer service. This is the layer the end-user interacts with