Network Security: Firewalls, Viruses, and Encryption
What is a Firewall?
A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks (like the internet), helping to prevent unauthorized access.
Types of Firewalls
- Packet-Filtering Firewall:
- It inspects each packet of data and checks the source, destination, port number, and protocol against a set of rules.
- Simple and fast but not very
MongoDB Sharding and CAP Theorem in Microservices
Week 9: Setup a MongoDB Cluster
What is MongoDB Sharding?
Sharding is the process of distributing data across multiple machines. MongoDB uses sharding to handle deployments with large data volumes and high-performance demands. Horizontal scaling (scale-out) involves adding machines to manage data load, allowing nearly limitless scaling for big data.
Why Sharding?
Sharding is essential when a single server can’t handle high workloads. It allows horizontal scaling, reducing the strain on individual
Read MoreNetworking Protocols: MIME, HDLC, RIP, OSPF, BGP, ARP, ICMP, TELNET
MIME Protocol
MIME (Multipurpose Internet Mail Extensions) is an extension of the SMTP (Simple Mail Transfer Protocol) used to allow email messages to include more than just plain text. MIME enables email to carry multimedia content, such as images, audio, video, and attachments, and it supports different character sets.
Key Features of MIME
- Support for Non-Text Content: Allows the transmission of multimedia content (images, videos, documents) over email, which SMTP alone cannot handle.
- Character Set
CPU Registers, Instructions, and Bus Systems Explained
CPU Registers: A Deep Dive
Registers are essential for supporting transactions, temporarily storing information to facilitate CPU operations. They are categorized as follows:
- General Purpose Registers: Store data currently in use.
- Segment Registers Memory: Store addresses and data locations.
- Instruction Registers: Monitor the CPU’s status (Flags, overflow, etc.).
Key Registers and Their Functions
- PC (Program Counter): Reads the memory address of the next instruction.
- MAR (Memory Address Register): Acts
Understanding Virtual Memory: Paging and Segmentation
Paging
The virtual address space is divided into pages of equal size. The main memory is divided into physical pages of the same size. These physical pages are shared among different processes in the system. A process will have a few pages resident in main memory (active) and the rest in secondary memory (inactive). The paging mechanism serves two functions:
- To carry out the task of transforming addresses, or set the page that corresponds to a particular address of a page, as well as the physical
Windows Forms Controls and Development: A Practical Approach
ToolStrip Control
The ToolStrip control lets you create a toolbar with the professional and consistent visual style of Microsoft Office. ToolStrip controls are containers for ToolStripItems.
The ToolStrip contains the following items:
- ToolStripButton: A button that can contain text or an image.
- ToolStripLabel: A label that displays text, images, and hyperlinks.
- ToolStripSplitButton: Represents a combination of standard buttons, a kind of menu.
- ToolStripDropDownButton: Represents a list box where the user