Chapter 2 - Sheet1

Question 1

Name the 7 OSI layers

Answer 1

Application (7), Presentation (6), Session (5), Transport (4), Network (3), Data Link (2), Physical (1)

Question 2

What is the purpose of the application layer?

Answer 2

responsible for finding the network resources broadcast from a
server and adding flow control and error control (if the application developer chooses).

Question 3

What is the purpose of the presentation layer?

Answer 3

presents data to the Application layer and is responsible for data translation and code formatting, like ASCII to non-ASCII conversions

Question 4

What is the purpose of the session layer?

Answer 4

sets up, maintains, and terminates sessions between applications.

Question 5

What is the purpose of the transport layer?

Answer 5

uses virtual circuits to create a reliable connection between two hosts

Question 6

What is the purpose of the network layer?

Answer 6

provides logical network addressing and routing through an internetwork

Question 7

What is the purpose of the data link layer?

Answer 7

provides framing and placing of data on the network medium

Question 8

What is the purpose of the physical layer?

Answer 8

responsible for taking 1s and 0s and encoding them into a digital signal
for transmission on the network segment

Question 9

What are the two sub-layers of the data link layer?

Answer 9

LLC (Logical Link Control) & MAC (Media Address Control)

Question 10

What is the purpose of the LLC sub-layer of the data link layer?

Answer 10

An LLC header tells the Data Link layer what to do with a packet once
a frame is received. Identifies network layer protocols and then encapsulates them. The LLC sublayer is responsible primarily for
the multiplexing of Network layer protocols

Question 11

What is the purpose of the MAC sub-layer of the data link layer?

Answer 11

The MAC sublayer is responsible for physical addressing and determining the appropriate time to place data on the network

Question 12

What layer do hubs operate on?

Answer 12

Layer 1

Question 13

What layer to repeaters operate on?

Answer 13

Layer 1

Question 14

We generally consider that a device operates at the ____ layer it supports

Answer 14

Highest

Question 15

What layer do switches operate on?

Answer 15

Layer 2 - because they understand and make decisions based on Layer 2 addresses (Data link layer)

Question 16

What layer do bridges operate on?

Answer 16

Layer 2 - because they understand and make decisions based on Layer 2 addresses (Data link layer)

Question 17

What layer do routers operate on?

Answer 17

Layer 3- because they route based on network addresses

Question 18

What layer(s) do workstations operate on?

Answer 18

Application layer, or “all layers”

Question 19

Which layer is responsible for converting frames from the Data Link layer into electrical signals?

Answer 19

Physical Layer

Question 20

Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?

Answer 20

Application Layer

Question 21

At which layer is routing implemented, enabling connections and path selection between two end systems?

Answer 21

Network Layer

Question 22

Which layer defines how data is formatted, presented, encoded, and converted?

Answer 22

Presentation Layer

Question 23

Which layer is responsible for creating, managing, and terminating sessions between applications?

Answer 23

Session Layer

Question 24

Which layer manages the transmission of data across a physical link and is primarily
concerned with physical addressing and the ordered delivery of frames?

Answer 24

Data Link Layer

Question 25

Which layer is used for reliable communication between end nodes over the network
and provides mechanisms for establishing, maintaining, and terminating virtual circuits
as well as controlling the flow of information?

Answer 25

Transport Layer

Question 26

Which layer provides logical addressing that routers use for path determination?

Answer 26

Network Layer

Question 27

Which layer specifies voltage, wire speed, and connector pin-outs and moves bits
between devices?

Answer 27

Physical Layer

Question 28

Which layer combines bits into bytes and bytes into frames and uses MAC addressing?

Answer 28

Data Link Layer