Network Services

Question 1

Web server - Network Services

Answer 1

• Respond to browser requests - Standard HTML/HTML5 protocols
• Web pages are stored on the server, downloaded to the browser
• Static pages or built dynamically in real-time

Question 2

File server - Network Services

Answer 2

• Centralized storage of documents, spreadsheets, videos, etc.
• Standard system of file management
• SMB (Server Message Block), Apple Filing Protocol (AFP), etc.
• The front-end hides the protocol - Copy, delete, rename, etc.

Question 3

Print server - Network Services

Answer 3

• Connect a printer to the network
• May be software in a computer, may be built-in to the printer
• Uses standard printing protocols - SMB (Server Message Block), IPP (Internet Printing Protocol), LPD (Line Printer Daemon)

Question 4

DHCP server - Network Services

Answer 4

• Automatic IP address configuration
• Available on most home routers
• Enterprise DHCP will be redundant

Question 5

DNS server - Network Services

Answer 5

• Convert names to IP addresses, and vice versa
• Distributed naming system
• Usually managed by the ISP or enterprise IT department

Question 6

Proxy server - Network Services

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
• Access control, caching, URL filltering, content scanning

Question 7

Mail server - Network Services

Answer 7

• Store your incoming mail, send your outgoing mail
• Usually managed by the ISP or the enterprise IT department
• Usually one of the most important services

Question 8

Authentication server - Network Services

Answer 8

• Login authentication to resources, extremely important service
• Almost always an enterprise service
• Usually a set of redundant servers that’s always available

Question 9

IDS and IPS - Network Services

Answer 9

• Network-based Intrusion Detection System / Intrusion Prevention System
• Intrusions - Exploits against operating systems, applications, etc.
• Buffer overflows, cross-site scripting, other vulnerabilities
• Detection – Alarm or alert
• Prevention – Stop it before it gets into the network

Question 10

All-in-one security appliance - Network Services

Answer 10

• 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 and embedded systems - Network Services

Answer 11

• Embedded systems - Purpose-built device
• Not usual to have direct access to the operating system
• Alarm system, door security, network switch