Network Quiz - 4.2, 4.3, 4.4

cell phone

a small computer

direct current (DC)

powers computers and cell phones’ internal circuits

virtual private network (VPN)

a type of encrypted network that gives you some security when you access the network from off-site

local area network (LAN)

a network entirely within the organization’s property

wide area network (WAN)

a network that extends off of the organization’s property, especially using public connections

storage area network (SAN)

an array of inter-connected disk drives or storage areas that can be accessed by the network

what are the two most failure-prone parts of a network server?

hard disk and power supply

what are things that network people really watch out for?

non-authorized people gaining entry

fire

temperature getting too high in the room

water (flooding, leaks)

unexpected noises

What is Halon and Inergen gas?

used for putting out fires by depriving the fire of oxygen

how can a gas deprive a fire of oxygen?

it displaces the oxygen which the fire needs in order to burn

redundant array of independent disks (RAID)

a group of disk drives connected together which are seen by the operating system as a single disk and which provide some measure of redundancy

mirroring

(aka RAID1) all data is written to both drives

uninterruptible power supply (UPS)

gets its power from the wall outlet; contains one or more batteries that can run the system for a short time even if external power is lost

firewall

a piece of software or hardware that tries to control what information (programs, etc.) can get into or out of a network

packet shaper

a device that controls data transfer rates for various applications according to a specified priority system

what’s another name for a packet shaper?

bandwidth shaper

intrusion detection system (IDS)

a hardware or software that monitors a network to look for potentially harmful software trying to enter the network or for violations of network policy

dynamic host configuration protocol (DHCP)

devices that assign IP addresses to computers on campus

domain name system (DNS)

naming database

external DNS

if they fail, would not be able to access any web sites off campus, but we could access al web sites on campus

internal DNS

if they fail, we could access all web sites off campus but probably not all web sites on campus

physical server

a dedicated computer that works as a server

virtual server

a single computer that behaves like several servers

cloud computing

storing data and/or running application on servers connected to the internet rather than on local computers

client

a computer connected to a network

thin client

a computer that cannot run the applications locally, but has to run them over the network

thick client

a full-featured computer which can run the application if they are installed on it, or it can run applications from a server

internet protocol (IP)

defines the address system (to/from)