Module five day two Flashcards
Why would I use non-routable space for internal IP addresses
IP addresses are scarce and expensive, non-routable space is secure.
NAT
Network address translation. A way to map many private addresses inside a local network to a public IP address Before trans frame the information onto the internet
who uses nat?
organizations that won multiple devices to employ single IP address, and most home routers.
What makes network configuration easier?
configuring local DNS and DHCP server
Is non-routable address space intended to access the internte?
no, unless you use Network Address Translation to translate non-routable IP addresses to public ones, allowing them to access the internet.
what network layer does NAT operate at?
3, the Network layer.
What reserves an alias IP address for a device in routable range?
NAT
What allows a private network to connect with the internet through the translated public IP?
NAT
WAN
Acts like a single network, but spans across multiple physical locations
What do WAN usually require?
I contract a link across the internet with my internet service provider
What handles sending data from one site to another?
ISP
Where does each LAN network end?
a demarcation point where the ISP network takes over.
what is the area between each demarcation point and an ISPs actual core network?
local loop
What is an example of a local loop?
something like a T carrier line, high speed optical connection to the provider’s regional office.
What would connect to the ISP’s core network and the internet at large?
WAN
What is a physical Connection that leaks a customer’s premises to a telecommunication service providers network?
local loop, local tale, subscriber line, last mile
How do WAN work?
busing different protocols at the data link layer to transport data from one site to another.
WAN protocols are sometimes at work
at the core of the internet itself.
What can be connected Through the internet with connections provided by internet service providers in each locale?
WAN
What can be formed by connecting multiple LAN sites using equipment and cables leased from a regional internet service provider?
WAN
what can be configured through virtual private networks
security for WAN across the public internet
what are hardware devices that act as intermediate systems to route data amongst the LAN member groups of a WAN using a private connection? they also facilitate and organization’s access to a carrier network. they also have a digital modem interface for the WAN, which works at the OsI link layer, and an ethernet interface for the LAN
WAN router, border router, edge router.
what is software developed to address the unique needs of cloud based WAN environments? they can be used alone or in conjunction with a traditional WAN, simplify how WAN are implemented, managed, maintained. the overall cost to operate them is less than the overall cost of equipping and maintaining a traditional WAN.
SD-WAN, software defined WAN.
Why do SD-WAN replace lines leased from an internet service provider by linking regional LAN together to build a WAN?
to reduce operational costs