TCP/IP and open system interconnection (OSI) models

Question 1

TCP/IP model is the common set of

Answer 1

protocol standards that permit the appropriate transmission of data

Question 2

TCP/IP model consists of

Answer 2

an application layer, a transport layer, a network layer, and a network interface laye

Question 3

OSI model is used to

Answer 3

enable the efficient transmission of data among hosts on a network

Question 4

TCP/IP: Application

Answer 4

This layer is responsible for the communication protocols between nodes. 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

TCP/IP: Transport Layer

Answer 5

This layer is responsible for the end-to-end transport of data. The protocols that live in this layer are transmission control protocol (TCP) and user datagram protocol (UDP).

Question 6

TCP/IP: Network Layer

Answer 6

This layer defines the logical transmission protocols for the whole network. The main protocols that live in this layer are internet protocol (IP), internet control message protocol (ICMP), and address resolution protocol (ARP).

Question 7

TCP/IP: Network Interface Layer

Answer 7

This layer establishes how data should be physically sent through the network.

Question 8

Physical Layer 1

Answer 8

This layer is responsible for the physical connections of the devices in the network. This layer is implemented through the use of devices such as hubs, repeaters, modem devices, and physical cabling.

Question 9

Data Link Layer 2

Answer 9

represents how computers logically connect to the network
This layer is responsible for the error-free delivery of data to the receiving device or node. 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 10

Network Layer 3

Answer 10

The Network layer is so named because it allows computers on different networks to exchange data.
This layer is responsible for the transmission of data between hosts in different networks as well as routing of data packets. This layer is implemented through the use of devices such as routers and some switches.

Question 11

Transport Layer 4

Answer 11

This layer provides services to the application layer and receives services from the network layer. 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 (for example, TCP does this). This layer is often called the heart of OSI.

Question 12

Session Layer 5

Answer 12

The Session layer allows computers to differentiate between the connections within a service on the same host. This would be similar to you keeping track of different conversations that you are having with the same person.
This layer is responsible for connection establishment, session maintenance, and authentication.

Question 13

Presentation Layer 6

Answer 13

The Presentation layer serves as a translation and security layer between applications, allowing computers to encode and encrypt data.
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.

Question 14

Application Layer 7

Answer 14

This layer is responsible for network applications (like HTTP or FTP) and their production of data to be transferred over the network.

Question 15

The OSI model’s layers 5, 6, and 7 correspond to

Answer 15

Layer 4 of the TCP/IP model. Here, the
application is opened, the command is entered, information is encrypted, and the connection is
established and maintained.

Question 16

Layer 4 of the OSI model corresponds to

Answer 16

o Layer 3 TCP/IP model. Here, the information is
segmented, numbered, and sent across the network in reasonable sizes

Question 17

Layer 3 of the OSI model corresponds to

Answer 17

o Layer 2 of the TCP/IP model. Here, the segments are
received and transmitted across the network as packets to the appropriate destination.

Question 18

Layers 1 and 2 of the OSI model correspond to

Answer 18

Layer 1 of the TCP/IP model. Here, the
information is received by the destination’s network router and physical addressing is added,
directing it along the correct network path to the intended recipient.

Question 19

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

Answer 19

link

Question 20

is a device necessary for sending and receiving data. allow computers to
transport digital information over analog lines, such as phone or cable lines.

Answer 20

modem
Types include cable modems, DSL modems, and satellite modems.

Question 21

is used to connect devices in a specific network and allowsthem to communicate
efficiently within the network. Is a more complex version of a hub, in that they
have the capability to add security measures and function far more intelligently, sending traffic
directly from the sender to the receiver without the other devices being aware of the
communication.
Thus, is less chatty and allows for more simultaneous conversations between devices.
Most internet routers include a ___ in the form of wired or wireless Ethernet connections

Answer 21

Switch

Question 22

is similar to a router in that it connects two or more networks. The difference is that
the router analyzes data packets to determine where to send the packet next, whereas a ____
simply forwards the data to the next network without analysis.
This make for fast data transfer that lacks versatility. They are not widely used in modern
networks, as routers and switches are the favored devices.

Answer 22

Bridge

Question 23

is a device used to strengthen, replicate, and regenerate signals that are weakened
(for example, because of distance) during transmission. In many large homes, the Wi-Fi signal
does not extend to the end of the house farthestfrom the router.
A range extender is a form or ___ that takes the distorted Wi-Fi signal and transmits is to
the formerly dead zone

Answer 23

Repeater

Question 24

connects the router to the network, takes the data packets from the router, and sends
them to all of the devices connected on the network. An example is a USB ___.
By connecting a USB ___ to your computer, data packets are able to be transferred to multiple
devices connected to your computer; each device then looks at only the traffic destined for it
and ignores the rest

Answer 24

Hub

Question 25

which layer is Modem in?

Answer 25

Physical (OSI Layer 1)
Data Link (OSI Layer 2)

Question 26

which layer is a switch in?

Answer 26

Data Link - Traditional Switch (OSI Layer 2)
Network - Layer 3 Switch (OSI Layer 3)

Question 27

which layer is router in?

Answer 27

Network (OSI Layer 3)

Question 28

which layer is hub in?

Answer 28

Physical (OSI Layer 1)

Question 29

which layer is bridge in?

Answer 29

Data Link (OSI Layer 2)

Question 30

which layer is repeater in?

Answer 30

Physical (OSI Layer 1)

Question 31

Which device is used to connect host devices within a local area network?

Answer 31

switch