Network Fundamentals #2

Question 1

Conceptual model to show how data is communicated through layers.

Answer 1

Open Systems Interconnection (OSI Model)

Question 2

Layers of OSI and mneumonic

Answer 2

Please - Physical
Do - Data Link
Not - Network
Throw - Transport
Sausage - Session
Pizza - Presentation
Away - Application

Question 3

Short explanation of each layer

Answer 3

Application - The Actual Application being used, for example email. Here the data is created.

Presentation - Data is converted and formatted. For example, into JPEG form for images.

Session - Creates a session ‘conversation’ between two applications

Transport - Using TCP, breaks down data into segments and begins sending it.

Network - Labels data with network addresses and creates a route for the data. Data is now called a packet.

Data Link Layer - Gets data from one device to another data by establishing a logical link. MAC address is added. Ethernet is in this layer

Physical Layer - Manages physical things like radio signals and speed, etc. The data is finally sent.

Question 4

Two kinds of IP addresses and which one is newer and which one is more common

Answer 4

IPv4 is older, but its more common and what you think of as IP.

IPv6 is newer.

Question 5

Composition of IP Address

Answer 5

4 Octets (4 numbers, 8 bit values each).

Question 6

Since each octet is an 8 bit value, what is the highest and lowest possible IP?

Answer 6

0.0.0.0 and 255.255.255.255

Question 7

The first two numbers determine what?

Answer 7

The network