Risk Assessment

Belmont State Bank (mini-case): Belmont state Bank is a large bank with hundreds of branches that are
connected to a central computer system.
Some branches are connected over dedicated circuits and others use multiprotocol label switching (MPLS).
Each client has a variety of client computers and ATMs connected to a server. The server stores the branches'
transactions and transmits it several times during the day to the central computer system.
Tellers at each branch site use a four digit numeric password, and each teller’s computer is transaction-coded
to accept only its authorized transactions.
Question: What security risk do you see here, or are implied by the overall architecture and policies?