Systems and Networks Flashcards
• Host/Client
A computer or device that is connected to the internet/network.
• Application Server
A server that holds applications
• Hub
A networking device that forwards packets to all segments.
• Switch
A networking device that has the ability to choose which segments it wants to forward the packet(s) to.
• Router
Networking device that acts as the default gateway.
• WAP
Wireless Access Point, device that broadcast a wired network using WI-FI, Bluetooth, etc.
• Proxy Server
Server that requests resources from other servers for a user to receive.
• Firewall
A device, set of devices and/or software that permits or denies off going/incoming network traffic.
• VPN Concentrator
An encrypted tunnel between hosts
• Back-up
Copy of data that is used to restore original data during a data loss event.
• Repeater
An electronic device that receives a signal and re-amplifies it so the signal can cover longer distances
• Access
This layer includes hubs and switches. It ensures packets are delivered to end user computer
• Distribution
This layer includes LAN-based routers and layer 3 switches. It ensures that packets are properly routed in the network
• Core
This layer includes high-end switches and backbones. It is concerned with speed and reliable delivery of packets (information).
• Topologies
are the physical or logical design of a network
• LAN
A computer network covering a small area such as a home or office.
• MAN
The largest type of network that spans cities and/or campuses. Example of this is the internet.
• GAN
Network that supports mobile communications, wireless LANS, etc via satellite.
• OSI
Is a way of sub-dividing a communications system into smaller parts called layers.
• TCP/IP
Is a way of sub-dividing a communications system into smaller parts called layers
IPv4 VS IPv6
Both are connection-less protocol that allow you to access a network(s). The difference is IPv4 is 32-bit while IPv6 is 128-bit.
• NMCI
Serves as the primary network for shore U.S. users.
• ONENET
Serves as the primary network for OCONUS shore users
• IT21
Serves as the primary network for all afloat commands.
• INFOCON
A defense system based on the status of information systems used to defend against network attacks.
• CNO
It is the actions taken via computer networks to protect, monitor, analyze and respond to network attacks that would compromise information systems.
• NCDOC
Oversees and monitors networks.
• FLTNOC
– Provides IP services to the fleet. (There are 4: PRNOC,UARNOC, ECRNOC and IORNOC.)
• NCTS
Provides secure, reliable, and timely services to U.S. commands.
• TBMCS
The system is used to track airborne resources.
• GCCS-M
Tracks enemies and allies and provides a COP(Common Operational Picture).
• DCGS-N
Network that provides access to GALE, GCCS-M and imagery applications
What is the difference between HTTP and HTTPS?
HTTP is unsecure while HTTPS is secure.
• VLAN
Segments the network so that other users can participate in their own network. An example of this is when marines ride the BHR network, yet have their own marine network.
port FTP
20/21
port SSH
22
port Telnet
23
port SMTP
25
port DNS
53
port HTTP
80
port POPv3
110
port HTTPS
443
• ISNS
A high-speed information network that provides communications to personnel
• OPSECON
Used to set internet capabilities for users.
• RIVERCITY
Used during emergency situations to limit information being released. EX: Man Overboard, GQ, Med-Evac, etc.
• EMCON
Used to reduce telecommunication signatures being sent off the ship. Set when needed to disguise ourselves.
