WHAT IS FIREWALL?
A firewall is neither a product nor a tiny, magical box with lots of blinking LEDs even if more IT security companies try to let you think so. A firewall is a security concept. It serves to protect the network and
computers from being attacked and is only as effective as the combination of itscomponents.
Typical parts of a firewall are a packet filter, intrusion detection system, intrusion pre- vention system, log analyzer,
continuous system updates, virus scanner, proxies,honeypot and/or VPNs. A packet filter works on layer 3 and 4 and decides which packets shall pass, be dropped, rejected or redirected depending on its rule-set. Intrusion detection systems can be classified into two different types: host- and net-work intrusion detection system. A host intrusion detection system (HIDS for short) locates successful attacks on a local computer by, for example, continuously checking all files and directories against a database of cryptographic checksums.
A network intrusion detection system (NIDS) therefore detects attacks in the network
traffic and can operate on all layers at the same time. Its functionality can be compared to a virus scanner, because it searches for signatures of known attacks. Additionally it has the possibility to learn what is classified as normal traffic in a network and the anomaly detection component alarms packets that differs from it.
~ @geekcode
A firewall is neither a product nor a tiny, magical box with lots of blinking LEDs even if more IT security companies try to let you think so. A firewall is a security concept. It serves to protect the network and
computers from being attacked and is only as effective as the combination of itscomponents.
Typical parts of a firewall are a packet filter, intrusion detection system, intrusion pre- vention system, log analyzer,
continuous system updates, virus scanner, proxies,honeypot and/or VPNs. A packet filter works on layer 3 and 4 and decides which packets shall pass, be dropped, rejected or redirected depending on its rule-set. Intrusion detection systems can be classified into two different types: host- and net-work intrusion detection system. A host intrusion detection system (HIDS for short) locates successful attacks on a local computer by, for example, continuously checking all files and directories against a database of cryptographic checksums.
A network intrusion detection system (NIDS) therefore detects attacks in the network
traffic and can operate on all layers at the same time. Its functionality can be compared to a virus scanner, because it searches for signatures of known attacks. Additionally it has the possibility to learn what is classified as normal traffic in a network and the anomaly detection component alarms packets that differs from it.
~ @geekcode
WHAT IS UDP?
UDP stands for User Datagrams protocol.
A communications protocol that facilitates the exchange of messages between computing devices in a network. It’s an alternative to the transmission control protocol (TCP). In a network that uses the Internet Protocol (IP), it is sometimes referred to as UDP/IP.
UDP divides messages into packets, called datagrams, which can then be forwarded by the devices in the network – switches, routers, security gateways – to the destination application/server. While UDP does not number or reassemble the datagrams, it does include port numbers in the datagram header that help distinguish different user requests and an optional checksum capability that can help verify the integrity of the data transferred.
~ @geekcode
UDP stands for User Datagrams protocol.
A communications protocol that facilitates the exchange of messages between computing devices in a network. It’s an alternative to the transmission control protocol (TCP). In a network that uses the Internet Protocol (IP), it is sometimes referred to as UDP/IP.
UDP divides messages into packets, called datagrams, which can then be forwarded by the devices in the network – switches, routers, security gateways – to the destination application/server. While UDP does not number or reassemble the datagrams, it does include port numbers in the datagram header that help distinguish different user requests and an optional checksum capability that can help verify the integrity of the data transferred.
~ @geekcode
#machinelearning
Scikit-learn team has come up with a MOOC course on "Machine learning in Python with Scikit-learn". 🤓
Github 🔗https://github.com/inria/scikit-learn-mooc
Happy learning! 😎
#supportus
~ @geekcode
Scikit-learn team has come up with a MOOC course on "Machine learning in Python with Scikit-learn". 🤓
Github 🔗https://github.com/inria/scikit-learn-mooc
Happy learning! 😎
#supportus
~ @geekcode
GitHub
GitHub - INRIA/scikit-learn-mooc: Machine learning in Python with scikit-learn MOOC
Machine learning in Python with scikit-learn MOOC. Contribute to INRIA/scikit-learn-mooc development by creating an account on GitHub.
WHAT IS SWITCHES ?
Switches facilitate the sharing of resources by connecting together all the devices, including computers, printers, and servers, in a small business network. Thanks to the switch, these connected devices can share information and talk to each other, regardless of where they are in a building or on a campus. Building a small business network is not possible without switches to tie devices together.
~ @geekcode
Switches facilitate the sharing of resources by connecting together all the devices, including computers, printers, and servers, in a small business network. Thanks to the switch, these connected devices can share information and talk to each other, regardless of where they are in a building or on a campus. Building a small business network is not possible without switches to tie devices together.
~ @geekcode
WHAT IS ROUTER?
Just as a switch connects multiple devices to create a network, a router connects multiple switches, and their respective networks, to form an even larger network. These networks may be in a single location or across multiple locations. When building a small business network, you will need one or more routers. In addition to connecting multiple networks together, the router also allows networked devices and multiple users to access the Internet.
Ultimately, a router works as a dispatcher, directing traffic and choosing the most efficient route for information, in the form of data packets, to travel across a network. A router connects your business to the world, protects information from security threats, and even decides which devices have priority over others.
~ @geekcode
Just as a switch connects multiple devices to create a network, a router connects multiple switches, and their respective networks, to form an even larger network. These networks may be in a single location or across multiple locations. When building a small business network, you will need one or more routers. In addition to connecting multiple networks together, the router also allows networked devices and multiple users to access the Internet.
Ultimately, a router works as a dispatcher, directing traffic and choosing the most efficient route for information, in the form of data packets, to travel across a network. A router connects your business to the world, protects information from security threats, and even decides which devices have priority over others.
~ @geekcode
WHAT IS GATEWAY?
Gateway is a network connecting device that can be used to connect two devices in two different networks implementing different networking protocols and overall network architecture. In other words, a gateway is a node on a network that serves as an entrance to another network.
A Gateway is the most intelligent device among the network connecting devices. Intelligent in terms of its working, error control, data packet routing, transmission speed, etc. It is a combination of both hardware as well as software components.
~ @geekcode ❤️
Gateway is a network connecting device that can be used to connect two devices in two different networks implementing different networking protocols and overall network architecture. In other words, a gateway is a node on a network that serves as an entrance to another network.
A Gateway is the most intelligent device among the network connecting devices. Intelligent in terms of its working, error control, data packet routing, transmission speed, etc. It is a combination of both hardware as well as software components.
~ @geekcode ❤️
Forwarded from GeekCode
After completing this terminologies we will share Cisco & other Networking paid courses for free to you guys.
#staytunned
It includes video content
By which you can get better knowledge about the networking
#WeNeedYourSupport
#share us
~ @geekcode
#staytunned
It includes video content
By which you can get better knowledge about the networking
#WeNeedYourSupport
#share us
~ @geekcode
⚡Learning Python Networking Programming ⚡
https://www.packtpub.com/product/python-network-programming/9781788835466
~ @geekccode
https://www.packtpub.com/product/python-network-programming/9781788835466
~ @geekccode
WHAT IS PROTOCOL ?
Define the rules that govern the communications between two
computers connected to the network.
-Roles: addressing and routing of messages, error detection and
recovery, sequence and flow controls etc.
-A protocol specification consists of the syntax, which defines the kinds
and formats of the messages exchanged, and the semantic, which
specifies the action taken by each entity when specific events occur.
Ex: HTTP protocol for communication between web browsers
and servers.
~ @geekcode❤️
Define the rules that govern the communications between two
computers connected to the network.
-Roles: addressing and routing of messages, error detection and
recovery, sequence and flow controls etc.
-A protocol specification consists of the syntax, which defines the kinds
and formats of the messages exchanged, and the semantic, which
specifies the action taken by each entity when specific events occur.
Ex: HTTP protocol for communication between web browsers
and servers.
~ @geekcode❤️
WHAT IS PROTOCOL LAYER?
The OSI (Open Systems Interconnection) Data Model
-ISO standard for computer networks design and functioning.
-Involves at least 7 layers, each playing a specific role when
applications are communicating over the net.
-During the sending process, each layer (from top to down) will add
a specific header to the raw data.
-At the reception, headers are eliminated conversely until the data
arrived to the receiving application.
~ @geekcode ❤️
The OSI (Open Systems Interconnection) Data Model
-ISO standard for computer networks design and functioning.
-Involves at least 7 layers, each playing a specific role when
applications are communicating over the net.
-During the sending process, each layer (from top to down) will add
a specific header to the raw data.
-At the reception, headers are eliminated conversely until the data
arrived to the receiving application.
~ @geekcode ❤️
THE TCP/IP MODEL !
Consists of only 4 layers: application, transport, internet and network.
Network layer
-Provides the same functionality as the physical, the data link and
network layers in the OSI model.
-Mapping between IP addresses and network physical addresses.
-Encapsulation of IP datagrams, e.g packets, in format understandable
by the network.
Internet layer
-Lies at the heart of TCP/IP.
-Based on the Internet Protocol (IP), which provides the frame for
transmitting data from place A to place B.
Transport layer
-Based on two main protocols: TCP (Transmission Control Protocol)
and UDP (User Datagram protocol)
Application layer
-Combines the functions of the OSI application, presentation, and
session layers.
-Protocols involved in this layer: HTTP, FTP, SMTP etc.
~ @geekcode
Consists of only 4 layers: application, transport, internet and network.
Network layer
-Provides the same functionality as the physical, the data link and
network layers in the OSI model.
-Mapping between IP addresses and network physical addresses.
-Encapsulation of IP datagrams, e.g packets, in format understandable
by the network.
Internet layer
-Lies at the heart of TCP/IP.
-Based on the Internet Protocol (IP), which provides the frame for
transmitting data from place A to place B.
Transport layer
-Based on two main protocols: TCP (Transmission Control Protocol)
and UDP (User Datagram protocol)
Application layer
-Combines the functions of the OSI application, presentation, and
session layers.
-Protocols involved in this layer: HTTP, FTP, SMTP etc.
~ @geekcode
CONCEPT OF NETWORK INTERCONNECTION
First implemented in the Defense Advanced Research Project Agency
Network (Arpanet), in 1966 in USA.
-Consists of connecting several computer networks based on different
protocols
-Requires the definition of a common interconnection protocol on top
the local protocols.
-The Internet Protocol (IP) plays this role, by defining unique addresses
for a network and a host machine.
~ @geekcode
First implemented in the Defense Advanced Research Project Agency
Network (Arpanet), in 1966 in USA.
-Consists of connecting several computer networks based on different
protocols
-Requires the definition of a common interconnection protocol on top
the local protocols.
-The Internet Protocol (IP) plays this role, by defining unique addresses
for a network and a host machine.
~ @geekcode