Which two methods advertise internal networks to external ISPs via BGP? (Choose two.)

A.
using aggregate routes

B.
defining routes via the network statement

C.
disabling synchronization

D.
forcing the next-hop address

Explanation:
In BGP, the network command tells the BGP process what locally learned networks to
advertise. The networks can be connected routes, static routes, or routes learned by way of
a dynamic routing protocol, such as RIP. These networks must also exist in the routing table
of the local router or they will not be sent out in updates. The mask keyword can be used
with the network command to specify individual subnets. Routes learned by the BGP
process are propagated by default but are often filtered by a routing policy.
Router(config-router)#network network-number [mask network-mask]