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Business Process Outsourcing, or BPO, refers to the process of contracting standard business functions to be handled by a party outside of the company.

BPO is the abbreviation for business process outsourcing, which refers to when companies outsource business processes to a third-party (external) company.

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TFTP User UDP Protocol and FTP uses TCP/IP Protocol
Correct me if i am wrong

FTP uses TCP/IP Protocol and is connection orientated -
this means that it uses error checking and flow control
where TFTP does not - it uses the basic UDP connectionless
protocol, so no error checking or flow control.

data flows in the form of packets from source to destination. packets consists of addresses.

VPN (Virtual Private Network)
A virtual private network (VPN) is a private network that
makes use of a public network (such as the Internet), while
maintaining security and privacy through encryption and
security procedures.
VPN's give companies an alternative to leasing an
expensive, dedicated private connection from one office to
another. Many businesses are using VPN on their servers to
allow their employees to connect to their server from home.

you need to open the respective port of VPN box like e.g if you are using SSL VPN then you have to NAT your router to 443 then you have to open port 443 on firewall and likewise.
hope that answer your question..