A set of rules or procedures for transmitting data between electronic devices. In order for computers to exchange information, there must be an agreement as to how the information will be structured and how each side will send and receive it.
A group of two or more computer systems linked together.
The amount of data (in bits) that can be sent in a fixed amount of time.
The capacity of data transfer in a system. Measured by bitrate.
The latency of a system is the time it takes for a bit to travel from sender to receiver. Fiber optic cables have low latency.
A new 128 bit version of the Internet Protocol.
The protocol that defines the payout of an an Internet address.
Distributed Denial of Service attack. Spam a web server with so many requests so close together that it crashes. Sometimes spitting out valuable information as it crashes.
a weakness which can be exploited by a malicious actor / attacker to perform unauthorized actions within a computer system.
a piece of software, a chunk of data, or a sequence of commands that takes advantage of a bug or vulnerability to cause unintended or unanticipated behavior to occur on computer software, hardware, etc.
AAA in network security stands for Authentication, Authorization and Accounting. It is used to refer to a family of protocols which mediate network access.
Remote Authentication Dial-In User Service (RADIUS) is a client / server protocol and software that enables remote access servers to communicate with a central server to authenticate users and authorize their access to the requested system or service.
A firewall is a system that provides network security by filtering incoming and outgoing network traffic based on a set of firewall rules. The purpose of a firewall is to reduce or eliminate the occurrence of unwanted network communications while allowing all legitimate communication to flow freely.
Intrusion detection systems (IDSs) are available in two different types: host-based intrusion system (HBIS) and network-based intrusion system (NBIS). An IDS tries to detect malicious activity such as denial-of-service attacks, port scans and attacks by monitoring the network traffic.
In network security, access control is the restriction of access to a place or other resource on a network. Permission to access a resource is called authorization.
Used to translate domain names into IP addresses.
The process of sending data between two computers on the internet. The data is sent through routers that determine the route.
When multiple paths exist between two points. This improves reliability and makes the internet fault tolerable. Makes the routing system scalable.
Packets are the units of data that are sent over the network.
a set of data that describes and gives information about other data.
Standardizes the layout of all packets. All packets must have a destination IP address, a from IP address, and the actual data being sent. Defines the layout of a SINGLE packet.
Allows for sending MULTIPLE packets between two computers. TCP checks that all packets arrived and can be put back in the proper order. The metadata must include a destination IP address, a from IP address, the message size and the packet order number.
Protocol that standardizes the language for talking to web servers to send and receive web resources. Defines how computers send and receive hypertext information. (HTTPS: The “S” denotes a secure connection using HTTP.)
Stands for Uniform Resource Locator. You are locating a resource that exists somewhere on the internet.
