2.4 – Services Provided by Networked Hosts Flashcards
DNS
Domain Name Service
a. Translates domain name to IP address
b. EX: Google.com to IP address
DHCP
Dynamic Host Configuration Protocol
a. Gives out IP addresses on a network
Fileshare
Shares files & folders on a network
Print Servers
Share printers
Mail Servers
Allows users to connect, send & receive emails
Syslog
a. Receives logs from devices in a network
b. Analyze it all in a central location
Web Servers
a. Serves web pages using the HTTP / HTTPs protocol
b. EX: Google / Amazon
Server Roles
Authentication
Authorization
Accounting
Authentication
o Ensures you are the correct person
o Uses password, key cards, biometrics
Authorization
o Ensures you can access the right data [what can you access]
o Usually done with file permission
Accounting
o Keeps track of what users are doing in their network
Internet Appliances
Spam Gateway
UTM
Load Balancers
Proxy Servers
Spam Gateways [Software]
Prevents spam from entering email
UTM
Unified Threat Management [device]
o Combination of anti-malware, firewall & IDS
o IDS = Intrusion Detection System
Load Balancers
o Gets all data & distributes it
o Allows multiple servers to be served the same amount of traffic
Proxy Servers
o Request webpages on behalf of users
o Can be used to filter out web traffic
o EX: block user from Facebook
Embedded System
OS embedded into server
o Older systems still on a network
o May NOT be secured as NO updates are available
o SCADA
SCADA
Supervisory Control & Data Acquisition
Older utility systems such as providing gas & electric power
May have to section off the network to ensure no access
Before computers existed
Computer system power 1960s/70s nuclear / water
NO updates
IoT = Internet of Things [Devices]
- All devices connect to the Internet
o Phones, cars, appliances, watch, etc - Can use many wireless protocols to work:
o Z-Wave & Zigbee
o BT
o NFC
o IR = Infrared [Remote controls]
o RFID
o 802.11 - All needs security
Z-Wave & Zigbee
Protocols allow wireless to talk [lightbulbs / light switches]
