Lesson 2

Question 1

Routers

Answer 1

Device that connects 2 or more packet-switched networks or subnetworks.

Question 2

Bridges

Answer 2

Used to divide a large network into smaller segments.

Question 3

Types of Bridge

Answer 3

1. Local - Connect 2 LAN segments
2. Remote - connected with another bridge over the WAN link
3. Wireless - Connects with another bridge over- the- air using radio signals for connectivity

Question 4

Hubs

Answer 4

Connect multiple computer networking devices, working only on the Physical layer of the OSI.
** Alsoi known as a REAPER **

Question 5

Types of Connecting Hubs

Answer 5

1. Simple - only 1 port for connecting a device to a network
2. Multiple-Port - Allows users to connect many devices

Question 6

Types of Hubs

Answer 6

1. Passive - Forwards data signals in the same format in which it receives them.
2. Active - Same as Passive, except it amplifies data signals before forwarding them – REPEATERS
3. Intelligent - smarter than passive & active. Contain some form of management software.

Question 7

Repeaters

Answer 7

Device that receives a signal and retransmits it at a higher level or higher power.

Question 8

Gateways

Answer 8

Connect networks operating on different protocols so data can transfer between destinations.

Question 9

Switches

Answer 9

Multipurpose device that improves network efficiency.

Question 10

Routers vs Switches

Answer 10

Routers allow the exchange of data among different networks, while a switch exchanges data within is own network.

Question 11

Firewalls

Answer 11

Restricted the internet traffic of a private network, controlling what goes out or comes in.

Question 12

Modems (Modular-Demodulator)

Answer 12

Converts digital signals into analog signals of different frequencies and transmits them to a modem at the receiving location.

Question 13

The OSI Model

Answer 13

7 layers that computer systems use to communicate over a network

Question 14

7 Layers of the OSI Model

Answer 14

1. Application
2. Presentations
3. Session
4. Transport
5. Network
6. Data Link
7. Physical

Question 15

OSI Model Application Layer

Answer 15

Used by end-user software such as web browsers and email clients.
Examples: HTTP, FTP, POP SMTP Z and DNS

Question 16

OSI Model Presentation Layer

Answer 16

Defines how 2 devices should encode, encrypt and compress data so it is received correctly on the other end.

Question 17

OSI Model Session Layer

Answer 17

Opens sessions and ensures they remain open and functional while data is being transferred and closing them when communication ends.

Question 18

OSI Model Transport Layer

Answer 18

Responsible for reassembling the segments on the receiving, turning it back into data that can be used by the session later.

Question 19

OSI Model Network Layer

Answer 19

2 functions
1. Breaks up segments into network packets and reassembling the packets on the receiving end.
2. Routing packets by discovering the best path across a physical network.

Question 20

OSI Model Data Link Layer

Answer 20

Established and terminates a connection between 2 physically connected nodes in a network.

Question 21

OSI Model Physical Layer

Answer 21

Responsible for the physical cable or wireless connection between network nodes.

Question 22

Nodes

Question 23

Node

Answer 23

Physical networked devices, such as modems, PCs and printers

Question 24

Network Interface Card

Answer 24

Enables devices to communicate with other devices.
Also known as: adapter Card, ethernet card or LAN card.

Question 25

3 Stages of Data

Answer 25

1. In use
2. At Rest
3. In Transit

Question 26

Linux Distribution

Answer 26

Linux-based operating system

Question 27

Popular Linux Distributions

Answer 27

1. Ubuntu
2. Fedora
3. StreamOS
4. Arch

Question 28

Kernel

Answer 28

Computer program at the core of a computers OS with complete control over everything in the system.

Question 29

BIOS

Answer 29

Basic Input/Output System

Question 30

3 Most Important Types of Linux Logs

Answer 30

1. Application Logs
2. Event Logs
3. System Logs

Question 31

ClamAV

Answer 31

Open- Source anti- virus toolkit and engine

Question 32

Iptables

Answer 32

Used to protect Linux from network access.