2.2. - Network Devices Flashcards
What do routers do?
They route traffic between IP subnets and make forwarding decisions based on the IP address.
At what level of the OSI network model do routers work?
OSI level 3.
What does a switch do?
Decides where data should be forwarded based on the destination MAC address.
What does ASIC stand for?
Application-specific integrated citcuit
What is an unmanaged switch? What are the downsides?
A switch with very few configuration options (no VLANs), and no SNMP capabilities so you can’t query it for performance information.
What are the benefits of a managed switch?
Port mirroring, redunandcy support via STP, traffic prioritization, VLAN support.
What is an access point? How does it make forwarding decisions?
A device that provides a link between the wired network and the wireless network. It makes forwarding decisions based on the MAC address, like a switch.
How does a firewall make filtering decisions?
Port number (OSI layer 4) and some can do application-level filtering (OSI level 5).
What can a firewall do?
Filter traffic, encrypt traffic, proxy traffic, and sometimes can act as a router.
What is PoE, when is it used?
A single wire that can provide electricity and network. Usually used when it’s difficult to get the power to the device.
What two kinds of PoE are there?
Endspans and midspans. Endspans are built-in power at the swtich, whereas midspans are in-line power injectors.
What is a hub?
A multi-port repeater. Any data that goes into one port is repeated to every other port.
What does a cable modem allow?
Broadband communication, transmission across multiple frequencies.
What is the cable network standard?
DOCSIS - Data over Cable Service Interface Specification
What does ADSL stand for, and what does it mean?
Asymmetric Digital Subscriber Line. Uses telephone lines, and “asymmetrical” means that the download speeds are faster than upload speeds, usually.
What does ONT stand for and what is used for?
Optical network terminal. Used to connect the internet service provider’s fiber network to the coper network.
What is a demarc?
The demarcation point in the data center. It means that any wiring inside of your house up to that demarc is your responsibility, and anything beyond it is the responsibility of the ISP.
What is a NIC?
A network interface card, which every device on the network has based on connectivity type. These are usually built into the the motherboard or added as an expansion card.
