Encapsulation and the OSI Model

Question 1

Do the contents of the website need to be split up into chunks to send it seamlessly to the client?

Answer 1

Yes

Question 2

Where are the chunks of data stored at the transport layer?

Answer 2

Header

Question 3

What is the data known as in a header?

Answer 3

Payload

Question 4

Name the order of the contents inside a TCP header.

Answer 4

Source Port, Destination Port, Flags, Sequence Number, Acknowledgement Number, Payload.

Question 5

What could this encapsulation process work like in a real-life example?

Answer 5

Sending a birthday card to a distant relative.

Question 6

What are the flags in a header?

Answer 6

General information about the transaction and what’s happening in it.

Question 7

What is a header known as at the transport layer?

Answer 7

A Segment

Question 8

What particular type of header is at layer 4?

Answer 8

TCP Header

Question 9

Where does the segment go to in a network layer header?

Answer 9

It becomes the payload.

Question 10

Name the order of contents of information in a packet?

Answer 10

Source IP, Destination IP, TTL (Time to Live), Other Information, Payload

Question 11

What is a network layer header known as?

Answer 11

A packet

Question 12

What particular type of header is at layer 3?

Answer 12

IP Header

Question 13

Where does the packet go in a data link layer header?

Answer 13

It becomes the payload.

Question 14

What is a header known as at the data link layer?

Answer 14

A Frame

Question 15

Name the order of contents in an Ethernet frame?

Answer 15

Source MAC Address, Destination MAC Address, Layer 3 Protocol, Payload

Question 16

Name the most common type of header at the data link layer

Answer 16

An Ethernet header

Question 17

Are there different types of headers at layer 2?

Answer 17

Yes, for example there could be DOCSIS-3 header going from the cable modem out on the internet.

Question 18

What would happen to the packet when switching frames?

Answer 18

If would simply come out of the Ethernet frame and into the DOCSIS-3 frame.

Question 19

With an ethernet payload, is there a maximum amount of data that it can carry? If so, what is it known as?

Answer 19

Yes, there is, it’s known as an Ethernet MTU (Maximum Transmission Unit)

Question 20

What is the typical amount of MTU for an Ethernet frame?

Answer 20

1500 Bytes

Question 21

What happens when the frame is sent down to the physical layer?

Answer 21

It gets converted into binary, then into a signal based on the type of wire or even if it’s wireless.