2 cissp ® Official Study Guide Eighth Edition

Latency
The time it takes a packet to travel from source to destination.
Jitter
The variation in latency between different packets.
Packet Loss
Some packets may be lost between source and destination, requiring 
retransmission.
Interference
Electrical noise, faulty equipment, and other factors may corrupt the contents 
of packets.

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Chapter 18 
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Disaster Recovery Planning
In addition to controlling these factors, QoS systems often prioritize certain traffic 
types that have low tolerance for interference and/or have high business requirements. For 
example, a QoS device might be programmed to prioritize videoconference traffic from the 
executive conference room over video streaming from an intern’s computer.
Recovery Strategy
When a disaster interrupts your business, your disaster recovery plan should kick in nearly 
automatically and begin providing support for recovery operations. The disaster recovery 
plan should be designed so that the first employees on the scene can immediately begin the 
recovery effort in an organized fashion, even if members of the official DRP team have not 
yet arrived on site. In the following sections, we’ll cover critical subtasks involved in craft-
ing an effective disaster recovery plan that can guide rapid restoration of regular business 
processes and resumption of activity at the primary business location.
In addition to improving your response capabilities, purchasing insurance can reduce the 
risk of financial losses. When selecting insurance, be sure to purchase sufficient coverage to 
enable you to recover from a disaster. Simple value coverage may be insufficient to encom-
pass actual replacement costs. If your property insurance includes an actual cash value 
(ACV) clause, then your damaged property will be compensated based on the fair market 
value of the items on the date of loss less all accumulated depreciation since the time of 
their purchase. The important point here is that unless you have a replacement cost clause 
in your insurance coverage, your organization is likely to be out of pocket as a result of any 
losses it might sustain. Many insurance providers offer cybersecurity liability policies that 
specifically cover breaches of confidentiality, integrity, and availability.
Valuable paper insurance coverage provides protection for inscribed, printed, and written 
documents and manuscripts and other printed business records. However, it does not cover 
damage to paper money and printed security certificates.