Compare And Contrast OSI Model Layers

Question 1

Promotes understanding of how components in a network system work by separating the function of hardware and software components to seven discrete layers which each perform a different group of tasks required for network communication.

Answer 1

Open Systems Interconnection (OSI) Reference Model

Question 2

Two or more computer systems that are linked by a transmission medium and share one or more protocols that enable them to exchange data

Answer 2

Network

Question 3

Set of rules for exchanging data in a structured format

Answer 3

Network protocol

Question 4

Describing where data messages should go. Unique identifier for a network node such as a MAC address, IPv4 address or IPv6 address.

Answer 4

Addressessing

Question 5

Describing how data messages should be packaged for transmission. A method by which protocols build data packets by adding headers and trailers to existing data.

Answer 5

Encapsulation

Question 6

Responsible for transmission and receipt of the signals that represent bits of data from one node to another node. This includes the network medium and mechanical and electrical specifications for using the media.

Answer 6

Physical layer

Question 7

Physical signal conductor provided between two nodes

Answer 7

Cabled

Question 8

Uses free space between nodes such as microwave radio

Answer 8

Wireless

Question 9

Layout of nodes and links as established by the transmission media

Answer 9

Physical topology

Question 10

Mechanical specifications for the network medium such as cable specifications, medium connector and pin-out details or radio transceiver specifications

Answer 10

Physical interface

Question 11

Part if a network interface that sends and receives signals over network media (part of PHY)

Answer 11

Transceiver

Question 12

A device that amplifies an electronic signal to extend the maximum allowable distance for a media type (part of PHY)

Answer 12

Repeator

Question 13

A multiport repeater deployed as the central point of connection for nodes (part of PHY)

Answer 13

Hub

Question 14

A device that converts one media signaling type to another (part of PHY)

Answer 14

Media converter

Question 15

A device that performs some type of signal modulation and demodulation such as sending digital data over an analog line (part of PHY)

Answer 15

Modem

Question 16

Responsible for transferring data between nodes on the same logical segment

Answer 16

Data Link layer

Question 17

Joins an end system host to network media (cabling or wireless) and enables it to communicate over the network by assembling and disassembling frames (part of layer2)

Answer 17

Network adapter or NIC

Question 18

Type of intermediate system the joins physical network segments while minimizing the performance reduction of having more nodes on the same network (part of layer 2)

Answer 18

Bridge

Question 19

An advanced type of bridge with many ports (part of layer 2)

Answer 19

Switch

Question 20

Allows nodes with wireless network cards to communicate and creates a bridge between wireless networks and wired ones

Answer 20

Wireless access point (AP)

Question 21

Responsible for moving data around a network of networks known as an inter network or the Internet for logical network addressing and forwarding.

Answer 21

Network layer

Question 22

An intermediate system working at the network layer capable of forwarding packets around logical networks of different layer 1 and layer 2 types.

Answer 22

Router

Question 23

OSI model layer responsible for ensuring reliable data delivery.

Answer 23

Transport layer

Question 24

OSI model layer that provides services for applications that need to exchange multiple messages (dialog control).

Answer 24

Session layer 5

Question 25

OSI model layer that transforms data between the formats used by the network and applications.

Answer 25

Presentation layer 6

Question 26

OSI model layer providing support to applications requiring network services like file transfer, printing, email, databases and so on.

Answer 26

Application layer 7