2.2 Network Devices Flashcards
NIC
Network interface card
Hardware that allows device to connect to network
Every device on a network has one
Specific to network you are connecting to. (Ethernet nic, wireless nic)
Connecting to multiple networks requires multiple nic’s
Often built into motherboard
Repeater
Extends wireless network reach
Boosts copper fiber connection
Recieves signal, regenerates it, resends signal out another interface
Hub & speed
Traffic going in one port is repeated to every other port
Half duplex - one device can send traffic at a time
More devices means less efficiency
Operate at 10 megabit or 100 megabit
Bridge
Makes decisions which traffic should be forwarded through bridge based on destination Mac address
Like a switch with 2-4 ports
Can connect different physical networks
- ethernet to WAN
Wireless access point
Modern bridge
Bridges wired ethernet to wireless
Switches
Forward data to correct mac address.
Done one very large scale, hundreds devices on one switch
Uses ASIC hardware (application specific integrated circuit)
Unmanaged switch
Use if installing network switch and need basic functionality
To configure just plug in all the devices and it will communicate on LAN
Less expensive
Multilayer switch
Aka: 3 layer switch
Device that as both switching (mac) and routing (ip) functionalities
Managed switch
Allow to configure different VLANS on different interfaces
- connect different switches together
- allows to prioritize traffic
- reduncy support using STP
- external management
- –> using SNMP (simple network management protocol)
- for troubleshooting - allows for port mirroring (allows you to copy traffic so you can keep an eye on traffic flow)
Routers
Routes traffic between IP subnets
Often connects diverse network types
- LAN
- WAN
- Ethernet copper connection
- ethernet fiber connection
WAP
Wireless access point
Not a router
A bridge that extends the wired network to connect to the wireless network.
Forwards data based on Mac address
Wireless LAN controller
centralizes all WAP’s so that they can be managed
Centralized management functions
- deploy new access points
- perform security monitoring
- configure and deploy changes to all sites
- report on access point use
Controller company same as wap company (cisco controller, Cisco wap)
Can also be cloud based
Firewalls
Filter traffic by port number
- allows for filtering by UDP or TCP port number (OSI layer 4)
- modern firewalls can filter by application (ex: prevent file transfers)
- can create encrypted tunnels through firewall to firewalls (VPN)
- can proxy traffic
- sits in between communication checks if a communication is safe to send to you
-can be used as router (layer 3 device)
Cable modem
Allow to connect to broadband network provided by cable company
Broadband
- transmission across multiple frequencies
- different traffic types
Uses DOCSIS standard
- data over cable Service Interface Specification
High speed networking
- 4 mbits/s through 250mbits/s
- gigabit possible
- supports data, voice service
DSL modem
Aka: ADSL (asymmetric digital subscriber Line)
- uses telephone lines
Download speed is faster then upload speed
10,000 foot limitation from house jack to central office
Living closer to office will give you faster speeds
52mbit/s Dowstream 16mbit/s upstream
