VPC 5 Flashcards
VGWs
What do VGWs connect?
Gateway connecting VPC to non-AWS networks
VGWs
What actual thing(s) are provisioned when you create a VGW?
Two ENIs, in separate AZs
VGWs
How many VPCs can a VGW connect to?
At most 1, but could be zero (like for Cloud Hub in VPN mesh networks)
VGWs
How do you move a connection attached to one VGW onto another VPC?
Move the VGW! It maintains its connection while moving!
VGWs
What specific things can connect to a VGW?
DX (Private VIF), DX Gateway (many VGWs share a DX), S2S VPN
VGWs
Speed cap for a VGW?
1.25 Gbps, even if there are multiple VPNs on the VGW
VGWs
What protocol do VGWs speak?
BGP - Border Gateway Protocol
VGWs
What is BGP used for, in a nutshell?
Protocol to automaticaly advertise and exchange CIDR prefixes on a WAN
VGWs
What networking assignments do VGWs have?
Private ASN (defaults to 64512, the lowest, non-reserved number)
VGWs
Are VGWs HA?
Yes. Like IGWs, they are multi-AZ. Each VGW gets 2 public IPs, each in different AZ.
VGWs
How do you connect more than one VPN or DX to a single VPC?
Connect everything to a single VGW: it’s a WAN device with an ASN, can handle lots of routing.
VGWs
How does VPC routing work with a VGW?
Turn on Route Propagation: VGW adds advertised CIDRs to VPC’s Route Table.
VGWs
What is Cloud Hub?
Multiple VPNS on a VGW, but all VPNs can communicate with each other.
VGWs
Big requirement for Cloud Hub to work?
Every VPN site has to have a unique ASN since VGWs only talk BGP.
