Tag Archives: Coursera

Day 44 – DNS and UDP

Posted on October 4, 2023 by Rose

DNS is a great example of an application layer service that uses UDP for the transport layer instead of TCP, this can be broken down into a few simple reasons TCP UDP A DNS server never needs to care about … Continue reading →

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Day 43 – DNS

Posted on October 3, 2023 by Rose

Computers only understand 1 and 0. DNS (Domain Name System) – A global and highly distributed network service that resolves strings of letters into IP addresses for you. The IP address for a domain name can also change all the … Continue reading →

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Day 42 – Transport and Application Layers

Posted on September 28, 2023 by Rose

Client: SYN packet sender – The client sends a SYN packet to the server via TCP. It tells the server where it wants to connect, and provides the initial sequence number. Server – SYN packet receiver SYN packet – The … Continue reading →

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Day 41 – Source IP and Destination IP

Posted on September 28, 2023 by Rose

Protocol The Protocol field in the IPv4 header contains a number indicating the type of data found in the payload portion of the datagram. (What kind of data is present?) Frame: HEADER IP DATAGRAM Data part that needs to be … Continue reading →

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Day 40 – Subnetting

Posted on September 26, 2023 by Rose

Valid IP Address Subnetting – the process of taking a large network and splitting it up into many individual smaller subnetworks or subnets. Address classes give us a way to break the total global IP space into discrete networks. Network … Continue reading →

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M1D18: Bits and Pieces of Computer Networking

Posted on March 22, 2023 by Rose

Five Network Layers The TCP provides mechanisms to ensure that data is reliably delivered. The Physical Layer is the first layer of the TCP/IP Five-layer network model. Data Link Layer – layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model … Continue reading →

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M1D17: Technical Support Fundamentals

Posted on March 17, 2023 by Rose

Glossary Abstraction: To take a relatively complex system and simplify it for our use Algorithm: A series of steps that solves specific problems ASCII: The oldest character encoding standard used is ASCII. It represents the English alphabet, digits, and punctuation … Continue reading →

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M1D6: JavaScript – Advanced Use of Operators

Posted on December 22, 2022 by Rose

Task 1: Using the logical && operator You are coding an RPG game, where each character has certain skill levels based on the value saved in their score. The expected output in the console should be: “Mid-level skills: true”. Task … Continue reading →

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M1D4: JavaScript

Posted on December 20, 2022 by Rose

Variables Activity My Solution Data Types Assignment Operators + – * / Comparison Operators > Greater than < Less than == Equal to != Not equal to Logical Operators && Check for both conditions to be true || Checks for … Continue reading →

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Introduction to HTML5

Posted on December 5, 2022 by Rose

DOM (Document Object Model) Clean Code – works on as many browsers as possible Dom provides common tree-like structures that we can prove to be valid or invalid. Three parts of a well-formed document: Doctype Head Markup Validation Service – … Continue reading →

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