1 - TCP/IP and OSI Models

Question 1

TCP/IP stands for ___.

Answer 1

transmission control protocol/internet protocol.

Question 2

___ is a set of protocols used to connect network devices to each other. Made up of four layers.

Answer 2

TCP/IP

Question 3

4th layer of TCP/IP

Answer 3

Application

Question 4

TCP/IP: This layer is responsible for the communication protocols between nodes.

Answer 4

Application

Note: The protocols in this layer include hypertext transfer protocol (HTTP and HTTPS), Secure Shell (SSH), and network time protocol (NTP), among many others.

Question 5

The 3rd layer of TCP/IP

Answer 5

Transport

Question 6

TCP/IP: This layer is responsible for the end-to-end transport of data.

Answer 6

transport

Note: The protocols that live in this layer are transmission control protocol (TCP) and user datagram protocol (UDP)

Question 7

TCP/IP: 2nd layer

Answer 7

Network

Question 8

TCP/IP: This layer defines the logical transmission protocols for the whole network.

Answer 8

network

Note: The main protocols that live in this layer are internet protocol (IP), internet control message protocol (ICMP), and address resolution protocol (ARP).

Question 9

TCP/IP: 1st layer.

Answer 9

Network Interface

Question 10

TCP/IP: This layer establishes how data should be physically sent through the network.

Answer 10

network interface

Question 11

The ___ model consists of a seven-layer architecture that organizes the sending of data from hosts across a network.

Answer 11

Open System Interconnection (OSI)

Note: The OSI model was developed by the International Standards Organization (ISO) after the TCP/IP model to provide greater granularity of networking assignments within the model.

Question 12

OSI: 1st layer

Answer 12

Physical

Question 13

OSI: This layer is responsible for the physical connections of the devices in the network.

Answer 13

Physical

Note: This layer is implemented through the use of devices such as hubs, repeaters, modem devices, and physical cabling.

Question 14

OSI: 2nd layer

Answer 14

Data Link

Question 15

OSI: This layer is responsible for the error-free delivery of data to the receiving device or node.

Answer 15

data link

Note: This layer is implemented through the use of devices such as switches and bridge devices, as well as anything with a network interface, like wireless or wired network cards.

Question 16

OSI: 3rd layer

Answer 16

Network

Question 17

OSI: This layer is responsible for the transmission of data between hosts in different networks as well as routing of data packets.

Answer 17

network

Note: This layer is implemented through the use of devices such as routers and some switches.

Question 18

OSI: layer 4

Answer 18

transport

Question 19

OSI: This layer provides services to the application layer and receives services from the network layer.

Answer 19

transport

Note: It is responsible for the reliable delivery of data. It segments and reassembles data in the correct order for it to be sent to the receiving device. It may also handle the reliable delivery of data and any retries of data that are lost or corrupted. This layer is often called the heart of OSI.

Question 20

OSI: layer 5

Answer 20

session

Question 21

OSI: This layer is responsible for connection establishment, session maintenance, and authentication.

Answer 21

session

Question 22

OSI: layer 6

Answer 22

presentation

Question 23

OSI: This layer is responsible for translating data from the application layer into the format required to transmit the data over the network as well as encrypting the data for security if encryption is used.

Answer 23

presentation

Question 24

OSI: layer 7

Answer 24

application

Question 25

OSI: This layer is responsible for network applications and their production of data to be transferred over the network.

Answer 25

application

Question 26

Which TCP/IP layer performs addressing and routing?

a) Presentation
b) Transport
c) Application
d) Network

Answer 26

d) Network

Question 27

Which layer of the OSI model does a bridge use to make decisions about forwarding data packets?

a) Physical
b) Network
c) Data Link
d) Transport

Answer 27

c) Data Link

Question 28

Which layer of the OSI model establishes, manages, and terminates connections?

a) Session
b) Presentation
c) Application
d) Network

Answer 28

a) Session