Ccna

Front 1

OSI Reference Model

Back 1

Physical, Data, Network, Transport, Sessions, Presentation, Application

Hint 1

PLEASE DO NOT THROW SAUSAGE PIZZA AWAY

Front 2

Physical Layer

Back 2

Physical Connectors, ie physical, mechanical, elec specs

Hint 2

Cables, Connectors, voltage

Front 3

Data Link Layer

Back 3

How data is formatted for transmission and how access to physical media is controlled

Hint 3

Includes error detection and correction to ensure reliable data delivery

Front 4

Network Layer

Back 4

Provides connectivity and path selection between two host systems located on geographically separated networks

Hint 4

Manages connectivity of users by providing logical addressing

Front 5

Transport Layer

Back 5

Defines services to segment, transfer and reassemble data for individual communication between end devices

Hint 5

Break down large files into smaller segments which are less likely to experience transmission problems

Front 6

Session Layer

Back 6

Establishes, manages, and terminates sessions between 2 communicating hosts. Synchronizes dialogue between the presentation layers of the 2 hosts and manages their data exchange

Hint 6

Web Servers communicating on the correct path

Front 7

Presentation Layer

Back 7

Ensures info sent at the application layer of one system is readable by the application layer of another system

Hint 7

PC program communicating with another CPU

Front 8

Application Layer

Back 8

Closest to user, provides network services to the application of the user

Hint 8

Email, file transfer and terminal emulation. Doesn't provide services to any other layer. Provides services to applications outside the OSI model

Front 9

TCP/IP Protocol

Back 9

Most popular in networks, specifies end to end connectivity, describing how data should be formatted, addressed, routed, and transmitted.

Hint 9

2LITA3

Front 10

Link Layer - TCP/IP

Back 10

Describes physical characteristics of a link, how access is controlled, and how data is formatted for transmission.

Hint 10

OSI- physical and data layer

Front 11

Internet Layer - TCP/ IP

Back 11

Provides routing of data from the source to the destination by defining the packet and the addressing schemes, moving data between the link layer and transport layers, routing packets of data to remote hosts, and performing fragmentation and reassembly of data packets.

Hint 11

OSI - Network Layer

Front 12

Transport Layer - TCP/IP

Back 12

Core of TCP/IP, provides communication services to the application processes that are running on network hosts

Hint 12

OSI - Transport Layer

Front 13

Application Layer - TCP/IP

Back 13

Provides applications for file transfer, network troubleshooting, and Internet activities. Supports network APIs, which allow programs that have been created for a particular operating system to access the network

Hint 13

OSI - Sessions, Presentation, Application

Front 14

Encapsulation - host sends data

Back 14

Application sends data to application layer, transport layer adds L4 header(hdr) to previous data, internet layer adds L3 hdr to previous data, link layer adds L2 hdr to previous data along with TRAILER(FCS), FCS is used by receiver to determine if it's an error.

Hint 14

Final - L2HDR+L3HDR+L4HDR+user data+other HDR+FCS(trailer)

Front 15

De-Encapsulation

Back 15

Link Layer checks FCS to see if data is an error. The frame may be discarded or link layer may ask to re-transmit. If the data isn't in error the link layer reads and interprets the control info in the L2 hdr. The link layer strips the L2 hdr and FCS then passes data up to internet layer. Each layer does the same until left with data to the application.

Hint 15

L2Hdr+L3Hdr+L4hdr+other HDR+fcs-L3hdr+L4hdr+other hdr- L4hdr+other HDR- data

Front 16

Peer to Peer Communications

Back 16

Each layer of the OSI model at the source must communicate with it's peer layer of the destination

Hint 16

App Layer - data - App Layer

Transport - segment - transport

Network - packet

Link - ftame