Chapter 5 - Supplemental Flashcards
Hub
a hub is the device that connects all the segments of the network
together in a star topology Ethernet network. Any transmission received on one port will be sent out all the other ports in the hub,
including the receiving pair for the transmitting device, so that Carrier Sense Multiple Access
with Collision Detection (CSMA/CD) on the transmitter can monitor for collisions.
NIC
Network Interface Card (NIC) is installed in your computer to connect, or interface, your
computer to the network. It provides the physical, electrical, and electronic connections to
the network media.
Bridge
A bridge—specifically, a transparent bridge—is a network device that connects two similar
network segments together. you’d be hard-pressed to buy a bridge today.
Switch
Switches connect multiple segments of a network together much like hubs do,
Differences between hubs and switches
a switch recognizes frames and pays attention to the source
and destination MAC address of the incoming frame as well as the port on which it was
received. Hubs don’t do those things. They simply send anything they receive on one port
out to all the others
Router
A router is a network device used to connect many, sometimes disparate, network segments
together, combining them into what we call an internetwork.
Firewall
Firewalls are the first line of defense for an Internet-connected network. Without
them in place, any network that’s connected to the Internet is essentially wide open to
anyone with a little technical savvy who seeks to exploit LAN resources and/or access
your network’s sensitive information.
DHCP Server
DHCP servers assign IP addresses to hosts
Dynamic DNS
Hosts register their names with the DNS sever as they receive their IP
address configuration from the DHCP server
Proxy Server
A proxy server is basically a type of server that handles its client-machine requests by
forwarding them on to other servers while allowing granular control over the traffic
between the local LAN and the Internet. When it receives a request, the proxy will then
connect to the specific server that can fulfill the request for the client that wants it.
Caching proxy server
caching proxy server speeds up the network’s service requests by
recovering information from a client’s or clients’ earlier request. Caching proxies keep local
copies of the resources requested often, which really helps minimize the upstream use of
bandwidth. These servers can greatly enhance network performance
Bridges aren’t used any longer, but ____ perform a similar function, an then some
Switches
Different names for router
Router, Layer 3 Switch, Multilayer Switch
Describe the benefits of using dedicated appliances for certain services.
Using appliances
to offload functions such as encryption, content filtering, and VPN concentration can
decrease the workload of other systems and add functionality that may be present in these
dedicated devices.
Identify the environmental requirements of infrastructure devices
A cool temperature,
ample ventilation, and the proper humidity level are all key to maintaining the operation
of devices like routers, switches, and appliances.
