Week 3 lecture

Question 1

what is hosted within an IT environment?

Answer 1

1. data
2. services
   3.applications

Question 2

what is a data centre?

Answer 2

a facility that centralizes organisation/ department IT operations and hardware

Question 3

what is the cloud?

Answer 3

an abstract concept referring to computer resources that:
1. is on a network in a remote location
2. provides services to other computers over the network
3. is managed by a 3rd party

Question 4

what is the cloud made up of?

Answer 4

a network of servers where each server has a different function

Question 5

what is a cloud provider?

Answer 5

a company that offers remote computing resources e.g. AWS, Azure, Oracle cloud

Question 6

what are the characteristics of the cloud?

Answer 6

-on-demand self service
-broad network access
-resource pooling
-rapid elasticity
-measured service

Question 7

what are the benefits of the cloud?

Answer 7

-cost
-flexibility
-secure backup
-reliability
-mobility

Question 8

what are the disadvantages of the cloud

Answer 8

-downtime
-cost
-security
-data transfer costs
-customer support

Question 9

what are the 3 cloud service models?

Answer 9

1. infrastructure as a service
2. platform as a service
3. software as a service

Question 10

what is a server?

Answer 10

a piece of computer hardware or software (computer program) that provides functionality for other programs or devices

Question 11

what is a web client?

Answer 11

A Web client typically refers to the Web browser in the user’s machine or mobile device

Question 12

how does a web browser make requests?

Answer 12

using TCP/IP, requests are made using HTTP (hypertext transfer protocol)

Question 13

what is a web server?

Answer 13

a network computer with the primary role of serving web pages to clients on request

Question 14

what is a HTTP session

Answer 14

a sequence of request-response transactions

Question 15

what is a HTTP request?

Answer 15

An HTTP request is made by a client, to a named host, which is located on a server. The aim of the request is to access a resource on the server.

Question 16

what is a HTTP response?

Answer 16

An HTTP response is made by a server to a client. The aim of the response is to provide the client with the resource it requested

Question 17

what is Apache Web Server?

Answer 17

the worlds most used web server which is open source and free

Question 18

what is a virtual host?

Answer 18

-a method for hosting multiple domain names on a single server.
-This allows one server to share its resources, such as memory and processor cycles, without requiring all services provided to use the same hostname.

Question 19

what is a name-based virtual host?

Answer 19

Name-based virtual hosting uses the host name presented by the client. This saves IP addresses and the associated administrative overhead but the protocol being served must supply the host name at an appropriate point.

Question 20

what is an IP-based virtual host?

Answer 20

IP-based virtual hosting is a method to apply different directives based on the IP address and port a request is received on. Most commonly, this is used to serve different websites on different ports or interfaces.

Question 21

what is remote access?

Answer 21

Remote access is the ability for an authorized person to access a computer or network from a geographical distance through a network connection.

Question 22

what is Telnet?

Answer 22

Telnet is a client/server application protocol that provides access to virtual terminals of remote systems on local area networks or the Internet.

Question 23

what components does telnet consist of?

Answer 23

-A connection is established, and session details and options are negotiated between the client and server.
-The application launches. From that point forward, generated traffic is user-driven.

Question 24

what is SSH?

Answer 24

The Secure Shell Protocol is a cryptographic network protocol for operating network services securely over an unsecured network.

Question 25

what is a SSH tunnel?

Answer 25

SSH tunneling, or SSH port forwarding, is a method of transporting arbitrary data over an encrypted SSH connection. SSH tunnels allow connections made to a local port (that is, to a port on your own desktop) to be forwarded to a remote machine via a secure channel.

Question 26

what is a container?

Answer 26

a unit of software that packages up code and all dependencies so the application runs from one computing environment to another

Question 27

what is docker?

Answer 27

Docker is a set of platform-as-a-service products that use OS-level virtualization to deliver software in packages called containers.