Network and IT Infrastructure Services

What are IT Infrastructure?

The Role of IT Infrastructure Services in SysAdmin?

Types of IT Infrastructure services?

• Physical - Workstation, Laptop, Printer, Scanner

• Software - software

• Network - Cloud, Server, wireless, switch, Router

• Directoty

• IaaS

• NaaS

• SaaS

• PaaS

• Windows Active Directory

• OpenLDAP

• Directory as a Service (DaaS)

How do Qwikable Works?

• SSH

• Remote Desktop

• Once the lab is finished, Qwiklabs destroys this virtualization machine

Server Operating Systems

Regular operating systems thet are optimized for server functionality

Virtualization

• Dedicated hardware
• Virtualized instance
• Performance
• Cost
• Maintainance
• Points of failure

Remote Access Revisited

• openSSH
• sudo apt-get install openssh-client
• sudo apt-get install openssh-server
• ssh devan@100.113.96.31

FTP, SFTP, and TFTP

• File transfer service (FTP) - No Encryption, Authentication
• SFTP - SSH Encryption, Authentication
• Trivial FTP - No Encryption, No Authentication
• Preboot Execution (PXE Boot)

NTP (Network Time Protocol)

Network Support Services Revisited

• intranet
  An internet network inside a company; accessible if you’re on a company’s network

• proxy server
  Acts as an intermediary between a company’s network and the internet

DNS

• Domain Name System (DNS)
  Maps human-undestanding names to IP addresses

DNS for web servers

• DNS settings
• IP address
• Authoritative DNS servers

DNS for Internal Networks

• 127.0.0.1 localhost
• 127.0.0.1 www.google.com

DHCP

• Dyanamic Host Configuration Protocol
• DHCPOFFER

Unable to Resolve a Hostname or Domain Name

• ping www.google.com
• nslookup www.google.com
• ping www.google.com
• sudo vim /etc/hosts