Connect And Protect: Networks And Network Security Flashcards
Network
A group of connected devices
Local Area Network (LAN)
A network that spans a small area like an office building, a school or a home
Wide Area Network (WAN)
A network that spans a large geographic area like a city, state, or country
Hub
A network device that broadcasts information to every device on the network
Switch
A device that makes connections between specific devices on a network by sending and receiving data between them
Router
A network device that connects multiple networks together
Modem
A device that connects your router to the internet and brings internet access to the LAN
Virtualization Tools
Pieces of software that perform network operations
Cloud Computing
The practice of using remote servers, applications, and network services that are hosted on the internet instead of on local physical devices
Cloud Network
A collection of servers or computers that stores resources and data in remote data centers that can be accessed via the internet
Cloud Service Providers Offer
On demand storage, processing power, analytics
Cloud Service Provider (CSP)
A company that offers cloud computing services
Software as a Service (SaaS)
Refers to software suites operated by the CSP that a company can use remotely without hosting the software
Infrastructure as a service (Iaas)
Refers to the use of virtual computer components offered by the CSP. These include virtual containers and storage that are configured remotely through the CSP’S API or web console
Platform as a Service
Refers to tools that application developers can use to design custom applications for their company
Benefits of Cloud Computing and Software Defined Network
Reliability, cost, and scalability
Data Packet
A basic unit of information that travels from one device to another within a network
Bandwidth
The amount of data a device receives every second
Speed
The rate at which data packets are received or downloaded
Packet Sniffing
The practice of capturing and inspecting data packets across a network
Transmission Control Protocol (TCP)
An internet communication protocol that allows two devices to form a connection and stream data
Internet Protocol (IP)
A set of standards used for routing and addressing data packets as they travel between devices on a network
Port
A software based location that organizes the sending and receiving of data between devices on a network
Port 25
Port 443
Secure internet communication
Port 20
Large file transfers
TCP/IP Model
A framework used to visualize how data is organized and transmitted across the network
Layers of the TCP/IP Model
Network access layer, internet layer, transport layer, application layer
Network Access Layer (Data Link Layer)
Organizes sending and receiving data frames within a single network. Corresponds to the physical hardware involved in network transmission
Address Resolution Protocol (ARP)
Assists IP with directing data packets on the same physical network by mapping IP addresses to MAC addresses on the same physical network
Internet Layer (Network Layer)
Responsible for ensuring the delivery to the destination host, which potentially resides on a different network. IP and ICMP
Internet Control Message Protocol (ICMP)
Shares error information and status updates or data packets
Transport Layer
Responsible for reliably delivering data between two systems or networks. TCP and UDP are the two transport protocols that occur at this layer
User Datagram Protocol (UDP)
Used by applications that are not concerned with the reliability of the transmission. Typically for video streaming
Application Layer
Responsible for making network requests or responding to requests
HTTP
Hypertext transfer protocol
SMTP
Simple mail transfer protocol
SSH
Secure shell
FTP
File transfer protocol
DNS
Domain name system
OSI Model
A standardized concept that describes the seven layers computers use to communicate and send data over the network
OSI Model 7 Layers
Application, presentation, session, transport, network, data link, physical
Internet Protocol (IP) Address
A unique string of characters that identifies the location of a device on the internet
MAC Address
A unique alphanumeric identifier that is assigned to each physical device on a network
