Chapter 2: Network Models

Question 1

A MAC address is known as a(n) ____ address.

Answer 1

physical

Question 2

A NIC sends data in discrete chunks called ______.

Answer 2

frames

Question 3

An IP address is also known as a _______ address.

Answer 3

logical

Question 4

Any device that deals with a MAC address is part of which layer of the OSI model?

Answer 4

Data Link (Layer 2)

Question 5

Anything that deals with pure IP packets (getting an IP packet to its destination) sits in the _______ layer.

Answer 5

Internet

Question 6

How much data can a typical frame hold?

Answer 6

1500 bytes

Question 7

In the TCP/IP model, any part of the network that deals with complete frames is in the ______ layer.

Answer 7

Link

Question 8

Is TCP connection-oriented or connectionless?

Answer 8

Connection-oriented

Question 9

Is UDP connection-oriented or connectionless?

Answer 9

Connectionless

Question 10

What are segments/datagrams given to help the receiving system know the total # of segments/datagrams and how to put them together?

Answer 10

Sequencing Numbers

Question 11

What are the chunks of data called at the Network Layer (Layer 3)?

Answer 11

Packets

Question 12

What are the first 3 tuples of a MAC address called?

The last 3?

Answer 12

-Organizationally Unique Identifier (OUI)

Question 13

What are the four layers of TCP/IP?

Answer 13

4) Application
3) Transport
2) Internet
1) Link/Network Interface

Question 14

What are the seven layers of the OSI model?

Answer 14

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

Question 15

What are the two sublayers of the Data Link Layer?

Answer 15

1) Logical Link Control (LLC)

2) Media Access Control (MAC)

Question 16

What are the two unique identifiers that each system has in a TCP/IP network?

Answer 16

1) IP address

2) MAC address

Question 17

What device uses IP addresses?

Answer 17

Router

Question 18

What does a NIC do if it doesn’t know the MAC address it’s trying to reach?

Answer 18

It sends a broadcast onto the network.

Question 19

What does de-encapsulation refer to?

Answer 19

Reverses the process of encapsulation

2 -> 3 -> 4 -> 5 -> 6 -> 7 -> app

Question 20

What does encapsulation refer to?

Answer 20

The entire process of preparing data to go onto a network

app -> 7 -> 6 -> 5 -> 4 -> 3 -> 2 -> 1

Question 21

What does OSI stand for?

Answer 21

Open Systems Interconnect

Question 22

What does TCP/IP stand for?

Answer 22

Transmission Control Protocol over Internet Protocol

Question 23

What does the FCS do?

Answer 23

Verifies that the data arrived correctly

Question 24

What does the session software do?

Answer 24

Handles connecting applications to applications

Question 25

What happens at the Presentation layer (Layer 6)?

Answer 25

Data from lower layers is translated into a format usable by the Application layer and vice versa.

Question 26

What happens in the Logical Link Control (LLC) sublayer?

Answer 26

- Talking to the system's OS - Handling protocols - Providing flow control

Question 27

What happens in the Media Access Control (MAC) sublayer?

Answer 27

- Creates and addresses the frame - Adds the NIC's own MAC address and attaches MAC addresses to the frames. - Adds or checks FCS

Question 28

What is a benefit of using frames?

Answer 28

Frames keep any one NIC from hogging the wire

Question 29

What is a NIC?

Answer 29

The Network Interface Card serves as the interface between the PC and the network.

Question 30

What is a switch?

Answer 30

A switch is a device that filters traffic by MAC address to get data to the correct places.

Question 31

What is an API?

Answer 31

An Application Programming Interface provides a standard way for programmers to enhance or extend applications' capabilities.

Question 32

What is CRC?

Answer 32

Cyclic Redundancy Check is what FCS uses to ensure data arrived correctly.

Question 33

What is the last layer that deals with hardware?

Answer 33

Network Layer

Question 34

What is the numbering namespace from which MAC address come from called?

Answer 34

Extended Unique Identifier (EUI)-48

Question 35

What is the structure of a basic frame?

Answer 35

Receiving MAC -> Sending MAC -> type -> data -> Frame Check Sequence (FCS)

Question 36

What is the structure of a packet?

Answer 36

Dest. IP -> Source IP -> Data

Question 37

What is UTP?

Answer 37

Unshielded Twisted Pair is a type of cable usually containing 4 pairs of wires that can transmit and receive data

Question 38

What are data chunks called at the Transport Layer?

Answer 38

Segments (for TCP) or Datagrams (for UDP)

Question 39

What uniquely identifies every NIC?

Answer 39

Media Access Controller (MAC) address

Question 40

What Windows utility do you use to find the MAC address for a system?

Answer 40

ipconfig /all

Question 41

Where does a hub send data?

Answer 41

To all systems connected to the hub.

Question 42

Which layer are cabling and the central box part of?

Answer 42

Physical (Layer 1)

Question 43

Which layer of OSI defines the method of moving data between two computers?

Answer 43

Physical (Layer 1)

Question 44

Which layer of the OSI seven-layer model keeps track of a system's connections to send the right response to the right computer?

Answer 44

The Session Layer (Layer 5)

Question 45

Which layer of the TCP/IP model controls the assembly and disassembly of data?

Answer 45

The Transport Layer

Question 46

Which of the following is an example of a MAC address? A) 0-255 B) 00-50-56-A3-04-0C C) SBY3M7 D) 192.168.4.13

Answer 46

B) 00-50-56-A3-04-0C