Which two key components are related to one firewall per ISP design option for e- commerce? (Choose two.)

A.
It is a common approach to single-homing

B.
This approach is commonly used in large sites

C.
Any failure on an edge router results in a loss of session

D.
It has one NAT to two ISP-assigned blocks

E.
It is difficult to set up and administer

Explanation:
E-Commerce Design Topologies for Connecting to Multiple ISPs

– ISP connectivity is a key component.
– In dual-homing topologies one common approach is One Firewall per ISP
– A critical factor is whether there are prefixes for each service provider connection or a single common external prefix for both ISP connections

The figure shows a common approach to dual-homing or connecting a site to two ISPs.
This approach is common among small sites since it is relatively easy to set up and administer.
The basic approach is to use a router and/or firewall to connect to each ISP.