Networking 101 - Anything Over IP

Sign in Subscribe

Networking 101

A collection of 11 posts

Cisco Access-lists (ACL's - Access Control Lists)

Cisco Access-lists (ACL's - Access Control Lists)

Access Control Lists (ACLs) are packet filters. They are a list of conditions that categorize packets. They can be helpful for security and for managing traffic flow. For security, ACLs can allow or deny packets to move through the network. For traffic flow management, ACLs can identify traffic that needs

CIDR - Classless Inter Domain Routing

CIDR - Classless Inter Domain Routing

CIDR stands for Classless Inter-Domain Routing. It is a method for allocating IP addresses and routing Internet Protocol packets. CIDR was introduced in 1993 to replace the previous classful network addressing architecture. What is CIDR? CIDR allows for more flexible allocation of IP address space than the traditional Class A,

Hashing, What is it and how does it work?

Hashing, What is it and how does it work?

Hashing, often referred to as a hash function, is a fundamental concept in computer science and cryptography. It's a mathematical algorithm that takes an input (or 'message') of any size and produces a fixed-size string of characters, which appears random. This output is called a hash

Ports and their use.

Ports and their use.

Ports can be a confusing subject at first, and in this post I hope to clarify what ports are and how they are used. First, let's look at what a port is. A port is a logical connection point. In the networking sense, it is used to identify

Useable IP addresses in private networks

Useable IP addresses in private networks

The goal of this post is to give a definitive answer to the question of the number of useable IP addresses for each private network. I say definitive because I've seen this number stated incorrectly in a few places. According to RFC 1918, we have three private network

Class-full IP Addresses

Class-full IP Addresses

Class-full IP Addresses IP addresses are divided into classes A, B, C, D and E. Classes A, B and C are used for addressing end devices like computers, printers, routers etc. Class D addresses are used for multicast and Class E addresses are reserved for experimental purposes. Class A Addresses

What is an IP address

What is an IP address

What is an IP address? An IP (Internet Protocol) address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. Think of it as a postal address for your computer or device on the internet. Types of IP Addresses IPv4

How to convert Hexadecimal into Decimal

How to convert Hexadecimal into Decimal

Hello, we are going to be looking at how to convert hex to decimal. This is going to be quite important in the CCNA, especially when working with subnetting and access control lists. Hexadecimal is basically a base 16 number system (0 1 2 3 4 5 6 7 8

How encryption works

How encryption works

Encryption is the process of converting readable information into a scrambled code that hides the information's true meaning. The purpose of encryption is to protect digital data confidentiality as it's stored on computer systems and transmitted using the internet or other computer networks. The outdated data

How to count in Binary

How to count in Binary

Understanding binary counting is fundamental for network engineers working with IP addressing, subnetting, and digital systems. Binary uses only two digits (0 and 1) instead of the ten digits (0-9) we use in decimal. Binary Place Values In decimal, each position represents a power of 10. In binary, each position

What is Binary?

What is Binary?

What is Binary? Binary is a number system that uses only two digits: 0 and 1. Unlike our everyday decimal system which uses ten digits (0-9), binary operates on base-2 mathematics. This system is fundamental to all computer operations, including networking equipment like Cisco routers and switches. Every piece of