Chapter 1

Question 1

What port does DNS use?

Answer 1

Port 53

Question 2

What port does FTP use?

Answer 2

Port 21

Question 3

What port does SSH use?

Answer 3

Port 22

Question 4

What port does SFTP use?

Answer 4

Port 22 (via SSH)

Question 5

What port does TFTP use?

Answer 5

Port 69

Question 6

What port does HTTP use?

Answer 6

Port 80

Question 7

What port does HTTPS use?

Answer 7

Port 443

Question 8

What port does SMTP use?

Answer 8

Port 25

Question 9

What port does IMAP use?

Answer 9

Port 143

Question 10

What port does POP3 use?

Answer 10

Port 110

Question 11

What port does SNMP use?

Answer 11

Port 161

Question 12

What port does Telnet use?

Answer 12

Port 23

Question 13

What does DNS stand for and what does it do?

Answer 13

Domain Name System - Translates domain names into IP addresses.

Question 14

What does DHCP stand for and what does it do?

Answer 14

Dynamic Host Configuration Protocol - Assigns IP addresses automatically.

Question 15

What does SNMP stand for and what does it do?

Answer 15

Simple Network Management Protocol - Monitors network devices.

Question 16

What are the 7 layers of the OSI model (top to bottom)?

Answer 16

Application, Presentation, Session, Transport, Network, Data Link, Physical

Question 17

What layer of the OSI model is responsible for reliable delivery and port numbers?

Answer 17

Transport layer (Layer 4)

Question 18

What layer handles routing and IP addressing?

Answer 18

Network layer (Layer 3)

Question 19

What layer uses MAC addresses and handles framing?

Answer 19

Data Link layer (Layer 2)

Question 20

What layer transmits raw bits over the medium?

Answer 20

Physical layer (Layer 1)

Question 21

What layer provides encryption and formatting?

Answer 21

Presentation layer (Layer 6)

Question 22

What layer manages sessions and dialog control?

Answer 22

Session layer (Layer 5)

Question 23

What layer interacts directly with applications?

Answer 23

Application layer (Layer 7)

Question 24

What is the data unit at the Physical layer?

Answer 24

Bits

Question 25

What is the data unit at the Data Link layer?

Answer 25

Frames

Question 26

What is the data unit at the Network layer?

Answer 26

Packets

Question 27

What is the data unit at the Transport layer?

Answer 27

Segments

Question 28

Which OSI layer does a router operate on?

Answer 28

Network layer (Layer 3)

Question 29

Which OSI layer does a switch operate on?

Answer 29

Data Link layer (Layer 2)

Question 30

What are the four layers of the TCP/IP model?

Answer 30

Application, Transport, Internet, Network Interface

Question 31

Which layer of the TCP/IP model maps to OSI layers 5-7?

Answer 31

Application layer

Question 32

Which layer of the TCP/IP model handles IP addressing?

Answer 32

Internet layer

Question 33

Which TCP/IP layer corresponds to OSI Transport?

Answer 33

Transport layer

Question 34

Which layer of TCP/IP handles NICs and hardware?

Answer 34

Network Interface layer

Question 35

Which protocol operates at the TCP/IP Internet layer?

Answer 35

IP (Internet Protocol)

Question 36

What is encapsulation?

Answer 36

The process of wrapping data with headers/trailers for each layer.

Question 37

What is decapsulation?

Answer 37

The process of removing headers/trailers as data moves up the OSI model.

Question 38

What is unicast communication?

Answer 38

One-to-one communication.

Question 39

What is broadcast communication?

Answer 39

One-to-all communication on a network.

Question 40

What is multicast communication?

Answer 40

One-to-many communication to a specific group.

Question 41

What protocol resolves IP to MAC addresses?

Answer 41

ARP (Address Resolution Protocol)

Question 42

What protocol resolves domain names to IP addresses?

Answer 42

DNS

Question 43

What is a client-server network?

Answer 43

A centralized model where servers provide services to clients.

Question 44

What is a peer-to-peer network?

Answer 44

Each device acts as both a client and a server.

Question 45

One benefit of client-server networks?

Answer 45

Centralized control and easier management.

Question 46

One benefit of P2P networks?

Answer 46

Easy to set up with no dedicated server needed.

Question 47

What does the ping command do?

Answer 47

Tests connectivity to another host.

Question 48

What does ipconfig do?

Answer 48

Displays IP configuration on a Windows device.

Question 49

What does tracert do?

Answer 49

Shows the path packets take to a destination.

Question 50

What does nslookup do?

Answer 50

Queries DNS to obtain domain-to-IP mapping.

Question 51

What is a host?

Answer 51

Any device that sends or receives data on a network.

Question 52

What is a protocol?

Answer 52

A set of rules that define communication between devices.

Question 53

What is a network?

Answer 53

A group of connected devices that share resources.

Question 54

What is a topology?

Answer 54

The physical or logical arrangement of network devices.

Question 55

What is a MAC address?

Answer 55

A unique hardware address assigned to network interfaces.

Question 56

What is an IP address?

Answer 56

A logical address used to identify a host on a network.

Question 57

What is a packet?

Answer 57

A formatted unit of data sent across a network.

Question 58

What is segmentation?

Answer 58

Breaking large data into smaller pieces for transmission.

Question 59

What is flow control?

Answer 59

Mechanism to prevent data overflow during transmission.

Question 60

What is a port number?

Answer 60

A logical address used to identify specific processes/services.