Networking

Question 1

Features of Virtual Network

Answer 1

known as vnet
Fundamental to Azure - every feature relies on vNet
secure comms between VMs and internet (and each other ?)
within a single region and single subscription
auto created when VM created
Subscription can have more than 1 vNET

Question 2

Setup Virtual Network

Answer 2

address space assigned

segmented by subnets (assists resource grouping and Network Security Groups (NSG’s)

Question 3

Benefits of Virtual Network

Answer 3

Scaling
HA via peering (load balancer, VPN gateway)
Isolation - subnets , security groups

Question 4

What is Peering

Answer 4

connect 2 or more vNets via MS private backbone

low latency / high bandwidth

Question 5

What is Load Balancer used for ?

Answer 5

manage traffic, good MS description
“new inbound flow to backend pool instances”
one access point
health probes to confirm VMs are healthy

Question 6

What is typically Load Balanced ?

Answer 6

Internet traffic
Internal networks
Port Forwarding ?
Outbound Traffic ?

Question 7

What is a VPN Gateway

Answer 7

used to send encrypted traffic from azure vNet to on-prem DC over internet
key part of secure hybrid cloud

Question 8

What does a VPN Gateway require ?

Answer 8

Azure vNET with VPN Gateway (on a Azure Gateway subnet)
Secure Tunnel (VPN tunnel)
On Prem Gateway to connect to - this must accept encrypted traffic
known as “Site to Site Connection”
can also have “Multi Site Connections”

Question 9

What is an Application Gateway ?

Answer 9

routing decisions based on properties of http requests (e.g. URL, host header)

e. g. http://videos - one VM pool
http: //images - separate VM pool

Question 10

Benefits of Application Gateway

Answer 10

auto scaling
end to end encryption
zone redundancy ??
multi-site hosting (100 sites supported).

Question 11

What is a Content Delivery Network (CDN) ?

Answer 11

distributed network of servers which will deliver web content close to users physical location via use of Edge Servers
results in better performance (prevents multiple round trips)
Scaling, Distribution

Question 12

How does CDN work ?

Answer 12

via a series of caching / data validation

edge nodes have an expiry dates - following which they will request a master copy from Origin server.

Question 13

What is an Express Route ?

Answer 13

private secure connection from on-prem to Azure Cloud
high bandwidth / low latency
public internet not utilised