Osi Model

Front 1

OSI

Back 1

Open Systems Interconnection 7-layer framework created by the ISO used for network communication

Front 2

ISO

Back 2

International Organization for Standardization

Front 3

Advantages of the OSI Model

Back 3

1. Layers interact only with adjoining layers

2. It has encouraged creation of industry standards

3. Network communication processes are segmented (making troubleshooting easier)

Front 4

OSI layer 7

Back 4

Application

Front 5

OSI layer 6

Back 5

Presentation

Front 6

OSI layer 5

Back 6

Session

Front 7

OSI layer 4

Back 7

Transport

Front 8

OSI layer 3

Back 8

Network

Front 9

OSI layer 2

Back 9

Data Link

Front 10

OSI layer 1

Back 10

Physical

Front 11

OSI Application layer

Back 11

Interacts with the end user and uses various protocols to determine whether sufficient network resources are available for network access

Front 12

OSI Application protocols

Back 12

DNS, HTTP, FTP, TFTP, DHCP, LDAP, POP3, SMTP, IMAP, SNMP, SMB

Front 13

OSI Presentation layer

Back 13

Translates data using various formats, compresses/decompresses data, and encrypts/decrypts data

Front 14

OSI Presentation formats

Back 14

ASCII, EBCDIC, MP3, JPG, GIF

Front 15

ASCII

Back 15

a data format that uses 128 codes to display characters

Front 16

OSI Session layer

Back 16

Establishes, maintains, and terminates sessions/connections, ensures data and resources for different applications are kept separate, and tracks the mode of transmission used by the computers

Front 17

OSI Session protocols

Back 17

NetBIOS, RPC

Front 18

Modes of data transmission

Back 18

Simplex, half-duplex, and full-duplex

Front 19

Simplex

Back 19

Data can be sent only one way

Front 20

Half-duplex

Back 20

Data can be sent both ways, but only one way at a time

Front 21

Full-duplex

Back 21

Data can be sent and received at the same time

Front 22

OSI Transport layer

Back 22

Handles flow control, reliability, error checking, and ordering for transported data, and divides and reassembles data into/from segments

Front 23

Segments

Back 23

Data traveling on the transport layer

Front 24

OSI Transport protocols

Back 24

TCP, UDP

Front 25

TCP

Back 25

Transmission Control Protocol- a connection-oriented protocol that provides guaranteed delivery of data

Front 26

UDP

Back 26

User Datagram Protocol- a connection-less protocol that provides a best-effort method of delivering data

Front 27

Number of possible TCP or UDP ports

Back 27

65,536

Front 28

Logical port number

Back 28

Used to identify what application, service, or protocol should process a given set of data

Front 29

Physical port number

Back 29

A physical connection on a device

Front 30

OSI Network layer

Back 30

Uses routing tables and IP addresses to determine the best route to a destination

Front 31

Packets

Back 31

Data traveling on the network layer

Front 32

OSI Network protocols

Back 32

IPv4, IPv6, ARP/RARP, IGMP, ICMP, IPSec, RIP, OSPF

Front 33

IPv4

Back 33

An addressing protocol that uses 32-bit addresses, commonly expressed in dotted decimal format

Front 34

IPv6

Back 34

An addressing protocol that uses 128-bit addresses, commonly expressed in hexadecimal format

Front 35

MAC address

Back 35

A 48-bit address assigned to network interface cards, represented with 12 hexadecimal characters (in 6 pairs)

Front 36

OSI Data Link layer

Back 36

Delivers data on a local area network (LAN)

Front 37

OSI Data Link sublayers

Back 37

LLC 802.2, MAC 802.3

Front 38

OSI Data Link protocols

Back 38

PPTP, L2TP, Token ring, ATM, Frame relay

Front 39

OSI Network devices

Back 39

Routers, layer 3 switches

Front 40

OSI Data Link devices

Back 40

Bridges, switches, NICs

Front 41

OSI Physical layer

Back 41

Defines the physical specifications of a network, converts data streams into binary, places data streams onto physical media as electrical or light pulses, and encodes signaling types (such as analog-digital)

Front 42

Frames

Back 42

Data traveling on the data link layer

Front 43

Bits (ones and zeros)

Back 43

Data traveling on the physical layer

Front 44

OSI Physical devices

Back 44

Cables, connectors, repeaters, hubs, NICs, modems, amplifiers

Front 45

OSI Physical protocols

Back 45

Ethernet, CSMA/CD

Front 46

Protocol Data Unit (PDU)

Back 46

Data present in the application, presentation, or session layers

Front 47

Modem

Back 47

A device that modulates (digital->analog) and demodulates (analog->digital) signals

Front 48

OSI Application devices

Back 48

Proxy servers, advanced firewalls