Firewall

FIREWALL

 A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. 

Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.

Three basic types of firewalls 

• packet filtering
•  application, 
• packet inspection

• Packet filtering: The system examines each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
  
  
  Three basic actions regarding the packet consist of a silent discard, with Internet Control  Message Protocol or TCP  response to the sender, and forward to the next hop. Packets may be filtered by source and destination IP  addresses, protocol, source and destination ports. 
• Application: This process applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.Different techniques are used to surface such security vulnerabilities at different stages of an applications life cycle such as design, development, deployment.
• Packet inspection: A proxy server is a type of gateway that hides the true network address of the computer(s) connecting through it. A proxy server connects to the internet, makes the requests for pages, connections to servers, etc.

• Endpoint specific: Endpoint based application firewalls function by determining whether a process should accept any given connection. Application firewalls filter connections by examining the process ID of data packets against a rule set for the local process involved in the data transmission. Application firewalls accomplish their function by hooking into socket calls to filter the connections between the application layer and the lower layers. Application firewalls that hook into socket calls are also referred to as socket filters.

E-learning (Merits and Demerits )

 As we know where whole world is suffering from this pandemic situation called covide-19. All the countries are suffering a lot of circumstances.  It has made a great loss in many sectors like business, education and many more organisation.  Due to this Covid-19 we students are not being able to join our class physically but the government and school administration have come upon with the newes idead of taking virtual class. The government has decided to continue teaching learning activities through online using electronic gadgets. There are some advantage and disadvantage of e-learning.  Some are mentioned below:-

Merits of e-learning are:- 

1) It enables both teachers and students to get into teaching learning activities from anywhere in anytime.

2) E-learning provides better understanding of course using different effective and interactive tool for presentation. 

3) It has become more beneficial for teachers as they can keep records of each and every students.

4) E-learning helast the teacher to deal with less attentive students when they are online. 

Demerits of e-learning are:-

1) There is limitation of modern technology and Internet access, 

2) The students can even chat privately in online class without being known by the respective tearchers.

3) Students may be distracted and misuse on the name of online class. 

4) E-learning tendso to create eye related problems and many more disense. 

                                          Thank You!!!