Flashcards in Telecommunications & Network Security Deck (415)
What are the 7 layers of the OSI Model
What is Data encapsulation?
In the OSI Model, Data encapsulation wraps protocol information from the layer immediately above in the data section of the layer immediately below.
What are the 4 common network topologies in use today?
Which is the most common network topology in use today? Ring, Bus, Star, Mesh
In which topology are all systems interconnected to provide multiple paths to all other resources.
Star, bus, mesh or ring
In which topology is each individual node connected to a switch, hub or concentrator?
Star, Mesh, Bus, Ring
Which network topology is commonly used for the most critical network components, ie routers, switches servers by using multiple NICs, server clustering, etc. to eliminate single points of failure?
Mesh, Bus, Ring, Star
In which network topology does traffic travel in a single direction?
Star, Bus, Ring, Mesh
In which network topology are all devices connected via a single cable that's terminated on both ends
Star, Bus, Mesh, Ring
What are the 4 basic cable types used in networks?
coaxial, twin-axial, twisted pair and fibre optic
Which type of cable is commonly used for cable or satellite television receivers?
twin-axial, coaxial, twisted pair, fibre optic
Which type of signal conveys information in a series or pulses through the presence or absence of electrical signals as opposed to wave frequencies?
Digital or Analog
Which type of cable is used to achieve high transmission speeds over short distances (often used by SAN's or switches connecting critical servers to a high speed core)
coaxial, fibre optic, twin-axial, twisted pair
What is Bit Error Ratio?
It's the ratio of incorrectly received bits to total received bits over a specified period of time
Which cable is the most common cable used by LAN's today?
Coaxial, Twisted pair, Fibre-optic, twin-axial
Twisted pair cabling can be shielded or unshielded. What are the benefits of shielded with regards security?
Reduces electromagnetic emissions which can be intercepted by an attacker. Also protects it from EMI and RFI from other sources.
Which term refers to the study of electromagnetic emissions from computers or related equipment?
Which type of CAT cables are available as Shielded Twisted pair only
CAT 7 and CAT 7a
Which type of cable uses light signals as opposed to electrical signals?
twisted pair, coaxial, twin-axial, fibre optic
Which cable has the advantage or high speed, long distance and best resistance to interference and interference?
twisted pair, coaxial, fibre optic, twin-axial
At which layer of the OSI model are network topologies, cable/connector types and interfaces defined
At which layer of the OSI model are NIC cards used?
Which type of card is used to connect a computer to a network?
What is the term used for a device that amplifies a signal to compensate for attenuation (signal loss)?
What two devices connect LAN segments together such as servers and workstations?
Hub (concentrator) and Switch
What are the two basic types of hubs?
Active and Passive
What s the difference between a hub and switch?
A switch sends packets to destination devices as opposed to a hub which will send packets to all devices on the network.
At which two layers of the OSI model can a switch operate?
Physical and Data
Which layer ensures that messages are delivered to the proper device across a physical network link?