DM5: Information Asset Security and Control Flashcards
What are examples of network security controls?
firewalls and intrusion detection systems
What is one major function of network security controls?
protection and critical alert information at borders between trusted and untrusted networks
What is a dedicated circuit?
symmetric telecommunications line connecting two locations
What is a switched circuit?
telecom line that does not permanently connect two locations and can be set up on demand using logical addressing
What are the types of switched circuits?
circuit switching and packet switching
What are switched circuits?
Mechanism used over telephone ISDN. Allows data connections that can be initiated when needed and terminated when complete, much like a telephone line.
What is packet switching?
Networks have connections into a carriers network where many customers share. The carrier creates virtual circuits between customers where packets are shared.
What is baseband?
analog telecom signal where signals are directly injected into the communications link and only one, half-duplex channel is available
What types of network architectures might an enterprise be implement?
modern networks (WAN); service oriented architecture (SOA);
What is a service oriented architecture (SOA)?
network architecture where components use simple object access protocol (SOAP) and XML to interoperate in a network
What is a benefit of a service-oriented architecture (SOA)?
information is highly accessible, available anytime and anywhere, and centrally managed for optimum netowrk use
What are common organizations networks?
Local, storage, wide, personal, and metropolitan
What is a LAN?
computer network that cover a limited area
What is a SAN?
variation of LAN dedicated to connecting storage devices to servers and computers
What is a WAN?
Computer network that covers a broad area (city, region)
What is a PAN?
Microcomputer network used for communication among devices used by a single person
What is a MAN?
WAN limited to a city or a region and have higher data rates than WANs
What are some examples of network services?
network file shares, email services, print services, remote access services, directory services, network management, DHCP, DNS
What is the purpose of DHCP?
Provides clients with IP address and other network parameters and ensures they are all unique.
Whats the purpose of a DNS?
translate names of network nodes into IP addresses (reference)
What does “interoperability” mean?
when connecting various system for communications where different sites may use media that could operate at different speeds
Whats the primary model used to understand network protocols?
Open Systems Interconnection (OSI) model
What are the 7 layers of the OSI below?
1) physical layer
2) data link layer
3) network layer
4) transport layer
5) session layer
6) presentation layer
7) application layer
What is the physical layer in the OSI model?
provides the hardware that transmits and receives signals. Typically defines cables, connectors, cards, and physical aspects of the hardware to connect to the network
What is the data link layer (OSI model)?
provides transfer of data across physical links; receives packets of data from the network layer and frames them; generally listens to only data intended for a single MAC address
What is the network layer (OSI model)?
creates a “virtual circuit” between the transport layers of the local device and other devices; layer that understands IP addresses; responsible for routing and forwarding data based on addresses
What is the transport layer (OSI model)?
provides transfer of data between end points; ensures that remote transport layers receives all data from the local session layer; acknowledges packets received from transport layer
What is the session layer (OSI model)?
Controls sessions between computers; establishes and manages connections between local and remote application layers and manages all data exchanges between them
What is the presentation layer (OSI model)?
standard interface for the application layer; converts outgoing data into standard format for the destination layer
What is the application layer (OSI model)?
interface for user-level applications; communicates resources to network and is used to access network resources
What is an acronym for the OSI model?
“People Dance Naked To Sexy Parties, Always!” PDNTSPA;
Which three OSI model layers align with TCP/IP’s application layer?
Application, presentation, session
What are the risks of a LAN?
-Loss of data and program integrity (unauthorized access)
-lack of data protection (poor version control)
-exposure to external activity (unauthorized access from outside)
-Virus/worms
-Illegal access through impersonation
-internal sniffing and spoofing
What is a repeater?
physical layer devices that extend the range of a network or connect networks together. They receive signals from one network segment and amplify the signal
What is a hub?
physical layer device that is the center of a star topology;
What is a bridge?
a data link layer device that connect LANs or create a LAN and WAN to reduce collision. They look at MAC addresses when forwarding data to devices
What is a layer 2 switch?
data link layer devices that interconnect network segments and help reduce collisions on ethernet-based networks. Use MACs and ASICs to better use data link protocols