Network Devices Flashcards
1
Q
NIC (Network Interface Card)
A
- fundamental network device
- every device on network has a NIC
- hardware needed to makie connection
- specific to network type (ethernet, WAN, wireless)
- often built-in to motherboard but can be addee as an expansion card
2
Q
Repeater
A
*extends a network connection over long distance
- receive signa, regenerate, resend
- no forwarding decisions to make
- Common use
- boost cooper or fiber connections
- convert one network media to another
- extend wirelss network reach
3
Q
Hub
A
- multi-port repeater
- traffic going in one port is repeated to every ohter port
- everthing is half-duplex, 2 devices cannot communicate at the same time
- less efficient as network soeeds increase
- 10 megabit / 100 megabit
4
Q
Bridge
A
- switch with 2 to 4 ports
- makes forwarding decisions in softwar
- connects different physical netowrks
- can connet different topologies
- gets around physical network size limitations/collisions
*distributes traffic based on MAC address
- WAP
- bridges wired to wireless
5
Q
Switches
A
- bridging done in hardware
- application specific integrated circuit (ASIC)
- forwards traffic based on data link address
- POE
- multi-layer, includes routing functionality
6
Q
Unmanaged Switch
A
- very few configuratopn options
- plug & play
- fixed configuration
- no VLANs
- very little integration with other devices
- no managment protocols
- low proce point
- simple is less expensive
7
Q
Managed switches
A
- VLAN support
- interconnect with other switches via 802.1Q
- traffic priorization
- voice traffic gets a higher priority
- redundancy support
- spanning tree protocol (STP)
- external management
- simple network managment protocol (SNMP)
- port mirroring
- capture packets
- used for troubleshooting
8
Q
Routers
A
- routes traffic between IP subnets
- makes forwarding deciosns based on IP address
- routers inside of switches called a layer 3 swirch
- often connects diverse network types
- LAN, WAn, cooperm fiber
9
Q
Wirelss access point (WAP)
A
- not a wireless router
- wireless router is a router & a WAP in a single device
- WAP is a bridge
- extends the wired network onto the wireless network
- makes forwarding decisions based on MAC address
10
Q
Wireless LAN contollers
A
- centralized management of WAPS
- single “pane of glass”
- management functions
- deply new access points
- performance & swcurity monitoring
- configure & deploy chnages to all sites
- report on access point use
- usually a proprietary system
- wireless controller is paired with access points
- can be cloud based
- manage console from anywhere
11
Q
Firewalls
A
*filters traffic by port number
_OSI layer 4 (TCP/UDP)
-some firewalls can filter thru OSI layer 7
- can encrypt traffic into/out of network
- protect your traffic between sites
- can proxy traffic
- common secuirty technique
- most firewalls can be 3 layer devices (router)
- usually sits on ingress/egress of the netowrk
12
Q
Cable Modem
A
- broadband
- transmission accross multiple frequencies
- different traffic types
- data is on the cable network
- DOCSIS (data over cable service interface specification)
- high speed networking
- 4 mbits thru 250 mbits are common
- gigabit speeds are possible
- multiple services
- data, voice, video
13
Q
DSL modem
A
- ADSL (Asymmetric Digital Subsriber Line)
- uses telephopne lines
- download speed is faster than the upload speed (asymmetric)
- ~10,000 foot limitation from the central office
- 52 mbit/s downstream / 16 Mbit /s upstream
- faster sppeds may be possible if closer to CO
14
Q
Patch panels
A
*combination of punch-down blocks & RJ45 connectors
- runs from desk are made once
- permenately punched down to patch panel
- patch panel to switch can be easily changed
- no special tools
- use existing cables
15
Q
Power over Ethernet (POE)
A
- power provided on ethernet cable
- one wire for both netowrk & electricity
- phones, cameras, wireless access points
- useful in difficult to power areas
- power provided at switch
- built-in power - endspans
- in-line power injector - midspans
