NETWORKS Flashcards
What is a Hub?
Layer 1; connects segments of a LAN
What is a Switch?
Layer 2; device that acts like a hub; can also route
What is a Router?
Layer 3; connects two or more computer networks
Layers of Routing; Describe ACCESS.
“The Desktop Layer”.
Layers of Routing; Describe DISTRIBUTION.
“The Workgroup Layer”.
Layers of Routing; Describe CORE.
“Backbone of the Network”.
Describe BUS Topology:
Utilizes coaxial cable. Data flows to every terminal.
Describe STAR Topology:
Most common. Computers connected to central switch.
Describe RING Topology:
Computers connected to each other. Data passes around ring until the destination is found.
Describe MESH Topology:
Interconnects every device on network. Rare; expensive.
Define LAN:
Local Area Network
Define WAN:
Wide Area Network
Define MAN:
Metropolitan Area Network
Define GAN:
Global Area Network
List the layers of the OSI Model:
7 Layers,
- Physical
- Data Link
- Network
- Transport
- Session
- Presentation
- Application
List the layers of the TCP/IP Model:
4 Layers;
- Network Interface
- Internet
- Transport
- Application
State the difference between IPv4 and IPv6:
IPv4-32 bit
IPv6-128 bit
Define NIPRNET:
Non-Secure Internet Protocol Router Network
Define SIPRNET:
Secure Internet Protocol Router Network
Define JWICS:
Joint Worldwide Intelligence Communications System
What is NMCI?
Navy and Marine Core Intranet; CONUS
What is ONENET?
OCONUS Internet
What is IT21?
Ship Based tactical and warfighting network
Give examples of High-Level Language:
Apple Script, C++, Java, Squirrel, Visual Basic
Define Operating System and give examples:
Programs in a computer that regulate computer hardware and the ways the user controls the computer. Linux, Unix, MAC, Windows
What is a Virus?
Attaches itself to a program or file so it can spread from computer to computer. A user has to execute, share the file, or send an email.
What is a Worm?
Self replicates automatically from one computer to another without needing user interaction.
What is a Dictionary Attack?
Entering every word in a dictionary as a password.
What is a Brute Force Attack?
Trying every possible code, combination, or password until you find the right one.
What is PKI?
Public Key Infrastructure
What is DNS?
Domain Name Service
What are the 3 layers of ROUTING?
Access, Distribution, Core
What does OSI stand for?
Open Systems Interconnection
Layer 1 of OSI model?
Physical; Bits
Layer 2 of OSI model?
Data Link; Frames
Layer 3 of OSI model?
Network; Packets
Layer 4 of OSI model?
Transport; Segments
What is a device that blocks/allows authorized and unauthorized protocols?
Firewall
What is a Repeater?
Used to replicate signals over long distances
What is a COMSPOT?
info concerning degradation of communications
