Explanation/Reference:
The main concern when recovering after a disaster is data, telecomm and IS facilities. Other services, in descending priority order are: IS operations, IS support services, market structure, marketing/public relations, customer service & systems support, market regulation/surveillance, listing, application development, accounting services, facilities, human resources, facilities security, legal and Office of the Secretary, national sales.
Source: BARNES, James C. & ROTHSTEIN, Philip J., A Guide to Business Continuity Planning, John Wiley & Sons, 2001 (page 129).

The Simple Network Management Protocol (SNMP) is a useful tool for remotely managing network devices.
Since it can be used to reconfigure devices, SNMP traffic should be blocked at the organization's firewall.
Using a VPN with encryption or some type of Tunneling software would be highly recommended in this case.
Source: STREBE, Matthew and PERKINS, Charles, Firewalls 24seven, Sybex 2000, Chapter 4: Sockets and Services from a Security Viewpoint.

The Bell-LAPadula model is also called a multilevel security system because users with different clearances use the system and the system processes data with different classifications. Developed by the US Military in the 1970s.
A security model maps the abstract goals of the policy to information system terms by specifying explicit data structures and techniques necessary to enforce the security policy. A security model is usually represented in mathematics and analytical ideas, which are mapped to system specifications and then developed by programmers through programming code. So we have a policy that encompasses security goals, such as "each subject must be authenticated and authorized before accessing an object." The security model takes this requirement and provides the necessary mathematical formulas, relationships, and logic structure to be followed to accomplish this goal.
A system that employs the Bell-LaPadula model is called a multilevel security system because users with different clearances use the system, and the system processes data at different classification levels. The level at which information is classified determines the
handling procedures that should be used. The Bell-LaPadula model is a state machine
model that enforces the confidentiality aspects of access control. A matrix and security
levels are used to determine if subjects can access different objects. The subject's
clearance is compared to the object's classification and then specific rules are applied to
control how subject-to-object subject-to-object interactions can take place.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 369). McGraw-
Hill. Kindle Edition.