Network Connections Using OSI Model

Question 1

Which layer in the OSI Model houses the network-aware application?

Answer 1

Application layer

Question 2

What is the TCP protocol?

Answer 2

Reliable communication; retransmit packets if they drop.

Example of applications that uses tcp: websites

Question 3

What is UDP Protocol?

Answer 3

Unreliable, fast communication; real-time. Just sends packets and doesn’t need an acknowledgment if they were received.

Example of applications that use UDP: gaming, phone calls, movies.

Question 4

TCP or UDP Protocol will allow an application to know how to transmit data that is meant for a specific service. True or False?

Answer 4

True.

Question 5

What does the transport layer do?

Answer 5

Chooses which protocol will be used. (Reliable or Unreliable)

Question 6

What does the application layer do?

Answer 6

Houses the application that is being used. Knows to communicate across the network.

Question 7

What does the presentation layer do?

Answer 7

Formats the data in a way that the receiving server can understand.

Encryption also happens at this layer

Question 8

What does the session layer do?

Answer 8

Builds up the connection, maintains it, then tears it down.

Question 9

What does the network layer do?

Answer 9

• Represent logical addressing (IP Address)

- checks where data is coming from and where it is going.

Question 10

What does the data Link layer do?

Answer 10

Physical addressing
-Ethernet
Defines source and destination MAC address
*cable type does not matter at layer 2

Question 11

What does the physical layer consist of?

Answer 11

The physical connection of the network. I.e, cables

Question 12

The Network layer allows for no control of the logical addressing when sending and receiving data. True or False?

Answer 12

False

Question 13

The data link layer deals with logical addressing of devices ? True or false?

Answer 13

Fakset

Question 14

Imagine you’re sending data to a server on a different network with an IP address of 10.1.1.55 and a MAC
address of aa:bb:cc:dd:ee:ff. Your nearest router has an IP address of 10.0.0.1 and a MAC address of
ff.ee:dd:cc:bb:aa. In this instance, which destination MAC address would be on the data packet when sending
from the original data source?

Answer 14

ff.ee:dd:cc:bb:aa

Question 15

Ports 1-1024 are well known port numbers and are used for most standard network communication. True or false

Answer 15

True

Question 16

Imagine you’re sending data from a workstation with an IP address of 10.1.1.50 to a server on a different
network with an IP address of 10.100.1.111 and a MAC address of aa:bb:cc:dd:ee:ff.Yournearestrouterhasan
IP address of 10.1.1.1 and a MAC address of ffee:dd:cc:bb:aa.In this instance, the destination IP address
would be
and the destination MAC address would be
on the data packet when the packet first
leaves your workstation.

Answer 16

10.100.1.111, ff:ee:dd:cc:bb:aa

IP address of the server and MAC address of the router

Question 17

What is added to the end of a frame that runs a has to ensure the data being sent is the same as what’s received?

Answer 17

FCS