[j-nsp] Loopback IP address in BGP Peering

[chenoi A]

Hai...just for understanding
loopback is configure in eBGP setup. Loopback is virtual interface.. 
a. in configuring bgp do we need to have loopback 
b. does it using private or public ip
c. in a block of IP /22 how many ip that we need to reserve for loopback
d. if i configure one interface with 211.1.221.3.1/30 , does the loopback using the same ip or others ip.
TQ in advance.