2.2 Networking Hardware Flashcards
1
Q
Routers
A
- routes traffic between IP subnets (network within a network)
- often connects LAN to WAN
- layer 3 device
- often connects diverse network types together (LAN, WAN, copper, fiber
2
Q
Switch
A
- connects devices in a network
- forwards traffic based on data link address (MAC address)
- many ports and features
- core of an enterprise network
3
Q
Unmanaged Switches
A
- very few configuration options
- no VLANS
- little integration with other devices: no management protocols, no SNMP capabilities
4
Q
Managed switches
A
- layer 2 switch with configuration features
- VLAN support
- traffic prioritization
- redundancy support: STP prevents loops between switches
- port mirroring
- external management: SNMP capabilities
5
Q
Access Point
A
- provides wireless connectivity for the local network (creates WLAN)
- “bridge”: extends a wired connection into a wireless connection
- makes forwarding decisions based on MAC address
- ex. a router with WiFi capabilities
6
Q
Central Wiring Closet
A
- main infrastructure of a network
- all devices are connected to its patch panel
- other side of the patch panel may have other connectors which then connect to interfaces on a switch
7
Q
Patch Panels
A
- combination of punch-down blocks and RJ-45 connectors
- cables are permanently punched down to a patch panel
- cables going to the switches can be unplugged when a change needs to be made
8
Q
Firewalls
A
- filters traffic by IP address and port number
- for security purposes
- OSI layer 4
- can encrypt traffic into/out of the network
- can proxy traffic
- most firewalls can also be a layer 3 device (router)
9
Q
PoE
A
Power Over Ethernet
- injector supplies power to PoE cabling
- power provided through an Ethernet cable (one wire for both network and electricity)
- endspan: power provided at the switch
- midspan: in-line power injector when the switch doesn’t support PoE
10
Q
PoE Switch
A
- Commonly marked on the switch or interfaces
- blue color over the ports = supports PoE
11
Q
PoE: IEEE 802.3af
A
15.4 watts DC power, 350 mA max current
12
Q
PoE+: IEEE 802.3at
A
25.5 watts DC power, 600 mA max current
13
Q
PoE++: IEEE 802.3bt
A
Type 3: 51 watts, 600 mA max current
Type 4: 71.3 watts, 960 mA
10GBASE-T
aka 4PPoE
14
Q
Hub
A
- commonly used to connect devices on a network before switches
- multi-port repeater: traffic going into one port is repeated to every other port
- half-duplex: data can only be sent in one direction at a time
- less efficient as traffic increases
- 10 megabit/ 100 megabit
15
Q
Cable modem
A
- broadband communication: transmission across multiple frequencies (television signal, internet data, phone lines)
- DOCSIS: Data Over Cable Service Interface Specification
- speeds up to 1 Gbit/s
- coaxial cable
- shared bandwidth
