Week 1 The TCP/IP Five-Layer Network Model

Question 1

What is the physical layer of the Five-Layer model?

Answer 1

cabling, connectors and sending signals

represents the physical devices that interconnect computers.

specifications for the networking cables
specifications for the connectors that join devices together
&
the specifications describing how signals are sent over these connections.

Question 2

What is the second layer in the Five-Layer Network Model & what is it responsible for?

Answer 2

The second layer is known as the “data link layer”

itsresponsible for defining a common way of interpreting signals, so network devices can communicate.

Its responsible for sending data in a single link.

Question 3

Lots of protocols exist at the data link layer, but the most common is known as what?

Answer 3

The most common protocol at the data link layer is known as Ethernet

Question 4

the Ethernet standards define a protocol responsible for getting what?

Answer 4

“getting data to nodes on the same network or link.”

Question 5

The third layer also known as the “the network layer” is also sometimes called the what?

Answer 5

The third layer also known as the “the network layer” is also sometimes called the “Internet Layer”

Question 6

What layer allows different networks to communicate with each other through devices known as routers?

Answer 6

The 3rd layer also known as “network layer” allows different networks to communicate with each other through devices known as routers.

Question 7

A collection of networks connected together through routers is a what?

Answer 7

A collection of networks connected together through routers is an “internetwork”

Question 8

What is the most famous internetwork?

Answer 8

the “Internet” is the most famous internetwork.

Question 9

Which layer is responsible for getting data across a single link?

Answer 9

the data link layer is responsible for getting data across a single link.

Question 10

Which layer is responsible for getting data delivered across a collection of networks?

Answer 10

The “Network Layer” is responsible for getting data delivered across a collection of networks.

Question 11

Think of when a device on your home network connects with a server on the Internet, which layer helps get data between these two locations?

Answer 11

the “Network Layer” helps get data between a device on your home network & the server on the internet

Question 12

The most common protocol used at the third layer network layer is known as what?

Answer 12

The most common protocol used at the third layer, network layer is known as IP or Internet Protocol.

Question 12

The most common protocol used at the third layer network layer is known as what?

Answer 12

The most common protocol used at the third layer, network layer is known as IP or Internet Protocol.

Question 13

What is the heart of the Internet and the heart of most small networks around the world?

Answer 13

IP is the heart of the Internet and most small networks around the world.

Question 14

Network software is usually divided into what two categories?

Which one initiates a request for data & which one answers the request across the network?

Answer 14

Network software is usually divided into “Client and Server” categories. with the “client application initiating a request for data” and the “server software answering the request across the network.”

Question 15

True or False?
A single node may be running multiple client or server applications. So, you might run an email program and a web browser, both client applications, on your PC at the same time, and your email and web server might both run on the same server. Even so, emails end up in your email application and web pages end up in your web browser. That’s because of the transport layer.

Answer 15

True

Question 16

Which layer delivers data between two individual nodes?

Answer 16

the network layer delivers data between two individual nodes.

Question 17

Which layer sorts out which client and server programs are supposed to get data.

Answer 17

the “transport layer” also known as “4th Layer” sorts out which client and server programs are supposed to get data.

Question 18

the protocol most commonly used in the fourth layer, the transport layer, is known as what?

Answer 18

the protocol most commonly used in the fourth layer, the transport layer, is known as TCP or Transmission Control Protocol.

Question 19

While often said together as the phrase TCP IP, to fully understand and troubleshoot networking issues, it’s important to know that they’re entirely different what

Answer 19

it’s important to know that they’re entirely different protocols serving different purposes.

Question 20

the network layer, in our case IP, is responsible for getting data from one node to another.
What layer is responsible for ensuring that data gets to the right applications running on those nodes.

Answer 20

the transport layer, mostly TCP and UDP, is responsible for ensuring that data gets to the right applications running on those nodes.

Question 21

What is the 5th Layer known as?

Answer 21

the 5th Layer is known as “the Application Layer”

Question 22

What are common protocols used on the 5th Layer?

Answer 22

Protocols used to allow you to browse the web or send receive email are some common ones.

Question 23

True or False?
You can think of layers like different aspects of a package being delivered. The physical layer is the delivery truck and the roads. The data link layer is how the delivery trucks get from one intersection to the next over and over. The network layer identifies which roads need to be taken to get from address A to address B. The transport layer ensures that delivery driver knows how to knock on your door to tell you your package has arrived. And the application layer is the contents of the package itself..

Answer 23

True

Question 24

What’s the difference between a client and a server?

Answer 24

A client requests data, and a server responds to that request.