Week 3 lecture Flashcards
what is hosted within an IT environment?
- data
- services
3.applications
what is a data centre?
a facility that centralizes organisation/ department IT operations and hardware
what is the cloud?
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
what is the cloud made up of?
a network of servers where each server has a different function
what is a cloud provider?
a company that offers remote computing resources e.g. AWS, Azure, Oracle cloud
what are the characteristics of the cloud?
-on-demand self service
-broad network access
-resource pooling
-rapid elasticity
-measured service
what are the benefits of the cloud?
-cost
-flexibility
-secure backup
-reliability
-mobility
what are the disadvantages of the cloud
-downtime
-cost
-security
-data transfer costs
-customer support
what are the 3 cloud service models?
- infrastructure as a service
- platform as a service
- software as a service
what is a server?
a piece of computer hardware or software (computer program) that provides functionality for other programs or devices
what is a web client?
A Web client typically refers to the Web browser in the user’s machine or mobile device
how does a web browser make requests?
using TCP/IP, requests are made using HTTP (hypertext transfer protocol)
what is a web server?
a network computer with the primary role of serving web pages to clients on request
what is a HTTP session
a sequence of request-response transactions
what is a HTTP request?
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.
what is a HTTP response?
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
what is Apache Web Server?
the worlds most used web server which is open source and free
what is a virtual host?
-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.
what is a name-based virtual host?
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.
what is an IP-based virtual host?
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.
what is remote access?
Remote access is the ability for an authorized person to access a computer or network from a geographical distance through a network connection.
what is Telnet?
Telnet is a client/server application protocol that provides access to virtual terminals of remote systems on local area networks or the Internet.
what components does telnet consist of?
-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.
what is SSH?
The Secure Shell Protocol is a cryptographic network protocol for operating network services securely over an unsecured network.
