What is a primary function of an underlay network?
A. to advertise Internet routes into an overlay network
B. to advertise loopback interfaces to establish an overlay network
C. to advertise server interfaces to establish an overlay network
D. to advertise client host routes into an overlay network
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Underlay Network
In data center environments, the role of the physical underlay network is to provide an IP fabric. Also known as a Clos network, its responsibility is to provide unicast IP connectivity from any physical device (server, storage device, router, or switch) to any other physical device.
https://www.juniper.net/documentation/en_US/release-independent/solutions/topics/concept/solution-iaas-understanding.html#:~:text=Solution%20Elements,-Underlay%20Network&text=In%20data%20center%20environments%2C%20the,to%20any%20other%20physical%20device.
From the link:
Underlay Network
In data center environments, the role of the physical underlay network is to provide an IP fabric. Also known as a Clos network, its responsibility is to provide unicast IP connectivity from any physical device (server, storage device, router, or switch) to any other physical device. An ideal underlay network provides low-latency, nonblocking, high-bandwidth connectivity from any point in the network to any other point in the network.
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So the answer is B