Network Service

Question 1

Web Server

Answer 1

• Respond to browser requests
  
  • Using standard web browsing protocols
  • HTML , HTML5
• Web pages are stored on the server
  
  • Downloaded to the browser
  • Static pages or built dynamically in real-time

Question 2

File Server

Answer 2

-Centralized storage of documents , spreadsheets , videos pictures & other files

• Standard system of file management
  
  • SMB (Server Message Block) Windows
  • Apple Filing Protocol (AFP) Apple
• The Front-end hides the protocol
  
  • Copy , delete , rename , etc

Question 3

Print Server

Answer 3

• Connect a printer to the network
  
  • Provide printing services for all network devices
• May be software in a computer
  
  • Computer is connected to the computer
• May be built-in to the printer
  
  • Network Adapter & software
• Uses Standard Printing Protocols
  
  • SMB = Server Message Block
  • IPP = Internet Printing Protocol
  • LPD = Line Printer Daemon

Question 4

DHCP Server

Answer 4

• Dynamic Host Configuration Protocol
  
  • Automatica IP address configuration
• Very common service
  
  • Available on most home routers
• Enterprise DHCP will be redundant
  
  • Usually running on central servers

Question 5

DNS Server

Answer 5

• Domain Name System
  
  • Converts names into IP addresses & vice versa
• Distributed naming system
  
  • The load is balanced across many servers
• Usually managed by the ISP or Enterprise IT department
  
  • Critical resource

Question 6

Proxy Server

Answer 6

• An Intermediate Server
  
  • Client makes the request to the proxy
  • The proxy performs the actual request
  • The proxy provides results back to the client
• Useful features
  
  • Access control , caching , URL filtering , Content scan

Question 7

Mail Server

Answer 7

• Store your incoming mail
  
  • Send outgoing mail
• Usually managed by the ISP or the Enterprise IT Dept.
  
  • A complex set of requirements
• Usually one of the most important services
  
  • 24x7 support

Question 8

Authentication Server

Answer 8

• Login authentication to resources
  
  • Centralized management
• Almost always an Enterprise Service
  
  • Not required on a home network
• Usually a set of redundant servers
  
  • Always available
  • Extremely important service

Question 9

IDS & IPS

Answer 9

• Network-based Intrusion Detection System
• Intrusion Prevention System
• Intrusion
  
  • Exploit against operating systems applications
  • Buffer overflows , cross-site scripting , other vulnerabilities

Detections vs Prevention

 - Detection - Alarm or alert
 - Prevention - Stop it before entering network

Question 10

All-in-One Security Appliance

Answer 10

-Next Generation firewall , Unified Threat Management
(UTM) / Web security gateway

• URL Filter / Content Inspection
  
  • Malware inspection
  • Spam filter
  • CSU / DSU
  • Router / Switch
  • Firewall
  • IDS / IPS
  • Bandwidth Shaper
  • VPN Endpoint

Question 11

Legacy & Embedded Systems

Answer 11

• Legacy Systems
  
  • Another expression for “really old”
• Embedded system
  
  • Purpose-built device
  • No direct access to the operating system
  • Alarm system , door security , time and system