Overview of networks Flashcards
5 9’s
99.999% up time
5 min downtime per year
Client
End-user device
Laptop, tablet, phone, server, etc
Any device that connects to a network
Server
Provides resources to the rest of the network
Web, file, chat, email, etc
Can be software or hardware
Hub
Older technology
Connects clients and servers
Receives info from one port -> rebroadcasts to all other ports
WAP
Wireless Access Point
Allows wireless devices to connect to a wired network
Acts as wireless hub
Switch
Newer version of a hub
Learns what devices are on which ports
Directs traffic to single ports based on MAC address
Better security and efficiency
Router
Connects 2 networks together
Forwards traffic to and from network based on IP address
Media
Connects 2 devices
Copper, fiber optic, radio, etc
WAN
Wide Area Network
Connects 2 geographically dispersed networks together
DSL, cable, fiber optic
Connects internal network to external network
Client/Server model
Used dedicated server to provide access to files, scanners, printers and other resources
Leading model used
Client/Server model Pros
Easy admin and backup
Centralized admin
Easier management
Better scalability
Client/Server model Cons
Higher cost
Specialized network operating system
Dedicated resources
Peer-to-Peer model
Peers share resources directly with others
Peer-to-Peer model Pros
Low cost
No dedicated resources
No specialized network operating system
Peer-to-Peer model Cons
Decentralized management
Inefficient for large networks
Poor scalability
Difficult admin and backup
PAN
Personal Area Network
Few meters distance
ex: bluetooth, USB
LAN
Local Area Network
300 feet distance
Small office or home
ex: Ethernet, Wifi
CAN
Campus Area Network
Building centric LAN
Several miles distance
ex: university
MAN
Metropolitan Area Network
25 miles distance
Connects location across a city
WAN
Wide Area Network
Worldwide coverage
Does not have to be public
Consists of leased lines or VPN tunnels over the internet
Physical topology
How devices are connected by media
Logical topology
How actual network traffic flows
ex: bus, ring, star, hub and spoke, full mesh, partial mesh
Bus Topology
Single cable runs length of network
Each machine taps into cable
Single collision domain
Ring Topology
Cable runs in circular loop
Token used to prevent collisions
