Information Technology Reference
In-Depth Information
test
Assessments, vulnerability scanning, and security auditing.
time-division multiplexing (TDM)
A type of digital multiplexing in which multiple channels
such as data, voice, and video are combined over one communication medium by interleaving
pulses representing bits from different channels.
To S
Ty pe of S er v ice field. This field of the IP v4 packet header spec ifies QoS parameters.
U.S. Health Insurance Por tabilit y and Accountabilit y Act (HIPA A)
HIPAA applies to the
protection of private health information that is used electronically.
U.S. Public Company Accounting Refor m and Investor Protection Act of 2002 (Sarbanes-
Oxley or SOX)
SOX focuses on the accuracy and the controls imposed on a company's
financial records.
unauthorized access
Gaining unauthorized access is the act of attacking or exploiting the
target host system.
Unicast RPF
Prevents unknown source addresses from using the network as a transport
mechanism to carry out attacks.
VA D
Vo i c e - a c t i v i t y d e t e c t i o n . U s e d fo r d e t e c t i o n a n d s u p p r e s s i o n o f p a c k e t s t h a t d o n o t
contain actual speech content.
VDC
Virtual Device Context. Used for device virtualization on the Cisco Nexus 7000 series
switches.
Virtual Private LAN Services (VPLS)
Defines an architecture that enables Ethernet
Multipoint Service (EMS) over an MPLS network.
VRF
Virtual routing and forwarding. A routing virtualization technology that creates multi-
ple logical Layer 3 routing and forwarding instances (route tables) that can function on the
same physical router.
virtualization
Allows for the consolidation of servers and other network components and
reduction of hardware infrastructure costs. It has gained popularity by industry leaders such
as VMware.
virtualization technologies
Virtualization technologies share a common theme in their abili-
ty to abstract logical elements from hardware (applications or operating systems) or networks
(LANs and SANs) and run them in a virtual state.
VLAN
Virtual LAN.
VLSM
Va r i a ble - l i n k s u bne t m a s k . V L S M s a l low t he d i v id i n g of t he I P add re s s s p ac e i n to
subnets of different sizes.
vPC
Virtual Port Channel (vPC) technology works by combining two Cisco Nexus 7000
series switches or two Cisco Nexus 5000 series switches with 10GE links, which are then rep-
resented to other switches as a single logical switch for port channeling purposes.
