WAN Architectures Flashcards
WAN stands for
Wide Area Network
MPLS stands for
Multi-Protocol Label Switching
Describe what a Leased Line is
A dedicated, private (not over the internet), physical connection between two sites.
Leased line typically means serial connections, with PPP or HDLC encapsulation. Basically dead at this point due to both cost and outdated tech
WAN via Ethernet typically involves which physical media?
Fiber
When sending traffic between sites over shared infrastructure (like the internet), best practice is to utilize what?
IPsec VPN Tunnels
T/F: MPLS networks are shared infrastructure since many enterprises can connect to and share the same infrastructure to make WAN connections
T
T/F: MPLS networks are private infrastructure since VPNs seperate the ISP infrastructure into multiple, smaller networks
F
MPLS networks still are shared infrastructure. VPNs just allow the ISP network to be utilized in such a way to provide virtually private
MPLS allows VPNs to be created over MPLS infrastructure through the use of:
Labels
What is an MPLS CE router
Customer edge, sits at the border of the enterprise LAN
What is an MPLS PE router
Provider edge, connects to a CE router and other MPLS infrastructure
What is an MPLS P router
Provider, connects to other P routers and PE routers, but doesn’t connect to CE routers
When are MPLS labels added to frames?
When PE routers receive frames from CE routers
Where are MPLS labels placed on a frame?
Between the L2 and L3 header
T/F: MPLS is generally transparent to CE routers, and CE routers don’t need to be MPLS capable
T
T/F: When using an L3 MPLS VPN, two CEs at different sites in a WAN will peer with their PE routers, and the two CE routers will learn about eachother’s routes through this peering
T
T/F: When using an L2 MPLS VPN, the CE and PE routers do not form peerings
T
T/F: When using an L2 MPLS VPN, the ISP network is entirely transparent to the CE routers, and basically acts like a big switch
T
T/F: When using an L2 MPLS VPN, if a routing protocol is used, the two CE routers will peer directly with eachother
T
Three of the most common internet access technologies are:
Fiber, Cable, and DSL
DSL stands for:
Digital Subscriber Line
DSL provides internet connectivity to customers over:
Phone lines
What is the function of a modem
Converts data into a format suitable to be sent over phone/CATV lines
Cable Internet provides internet connectivity to customers over:
Cable TV lines (CATV)
T/F: A modem is required to provide internet access over DSL
T
DSL connections require a modem to convert internet data into a format suitable for phone lines
