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  • Tech

    Network Monitoring–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 16, 2021 /

    Network Monitoring SNMP (Simple Network Management Protocol) SNMP uses (listens on) UDP port 161 or port 10161 when using TLS. SNMP–managed devices run an agent that talks with a N.M.S. (Network Management Station) (Note: A NMS can run on a virtual machine.) N.M.S. (Network Management Station) SNMPv1 is unencrypted, SNMPv2 added basic encryption, SNMPv3 added TLS encryption. (It’s ok if there are different versions on the same setup.) SNMP allows us to administer & manage network devices from a single source. SNMP Manager is the device that “talks with” SNMP devices. The SNMP Manager (usually a computer) runs the NMS (the interface that talks with the managed devices). The NMS…

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    Aaron Comments Off on Network Monitoring–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Blockchain & Money: Session 19: Primary Markets, ICOs, and Venture Capital, Part 1, by M.I.T. Sloan School of Management with Professor Gary Gensler

    April 21, 2021

    A 3-Tiered Approach to Securing Your Home Network

    March 10, 2021

    How to Get Into Cybersecurity with No Experience [Video]

    December 30, 2020
  • Tech

    Managing The Network–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 16, 2021 /

    Managing The Network Managing Risk What is Risk Management? Security policies are documents with broad overview statements. Security controls provide more details. Procedures discuss specific implementation of policies. Security Policies Security Policies document to users how to access system resources and what is allowable and acceptable. Safety policies apply to the IT department, too! NDA’s, software licensing, & data restrictions need to be considered to protect an organization. A.U.P. (Acceptable Use Policy) What can people do with company equipment?? defines ownership; web-site access; access times; R.A.P. (Remote Access Policy) VPN usage; Authentication rules; Password Policy Complexity; Lockout IT Safety Policy Lifting equipment; Equipment handling; Spills; Procedures; License Restrictions Usage; Transfer;…

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    Hashes–Another Data Structure!!! [Ruby Programming Language Notes]

    May 18, 2021

    Hackers Breach Thousands of Security Cameras, Exposing Tesla, Jails, Hospitals…

    March 10, 2021

    Local Area Networking—NETWORKING ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 6, 2021
  • Tech

    Building a Real-World Network–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 15, 2021 /

    Building a Real-World Network Network Types Know the differences between all the “area network” acronyms. Geographical: LAN, WAN, CAN, MAN, Internet; Wireless: WLAN, PAN; Network Design Network design starts with assessing customer needs. Design considerations include documentation, compatibility with existing hardware & software. Bring in security early & make sure to assess external connectivity. Assess current networking infrastructure. Analyze existing network documentation. Assess wireless needs. Power Management UPS–Uninterruptible Power Supply A UPS is a battery back-up & should be used for short-term power loss. Power generators can be diesel or gas, and are used to maintain power for when electric power is not available. Dual power supplies and redundant circuitry…

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    Aaron Comments Off on Building a Real-World Network–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Blockchain & Money: Session 7: Technical Challenges by M.I.T. Sloan School of Management with Professor Gary Gensler

    April 16, 2021

    Data Members, ‘set’ Functions, & ‘get’ Functions–C++ Notes (C Plus Plus Notes)

    May 26, 2021

    Blockchain & Money: Session 19: Primary Markets, ICOs, and Venture Capital, Part 1, by M.I.T. Sloan School of Management with Professor Gary Gensler

    April 21, 2021
  • Tech

    Mobile Networking–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 15, 2021 /

    Mobile Networking Cellular Technologies Mobile communication can use cellular towers which have a range of over 17 miles. Cellular WAN has developed several standards to handle data traffic. Mobile protocols include: HSPA–3G, HSPA+–4G, and LTE. WiMax–extension of Wi-Fi networks; uses the 802.16 standard for more range than the 802.11 standard. HSPA (High Speed Packet Access)–single Mbps range 3G technology. HSPA+–multiple Mbps range; considered a 4g technology. LTE–ten’s of Mbps range; 4G technology. Tethering–using the cell phones signal to get other devices online. Can be wired or wireless (hotspot). Mobile Connectivity ANT/ANT+ are used for health applicances (e.g.-monitoring; workout equipment; heart-rate monitors; watches), run in 2.4GHz band, range is 20-30 meters,…

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    Aaron Comments Off on Mobile Networking–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Classes: A Deeper Look, Part 2–STRUCTURED PROGRAMMING Course Notes

    May 31, 2021

    Portable Computing—NETWORKING ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 8, 2021

    Control Statements–STRUCTURED PROGRAMMING Course Notes

    May 27, 2021
  • Tech

    Virtualization & Cloud Computing–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 15, 2021 /

    Virtualization & Cloud Computing Virtualization Basics Don’t confuse virtualization with emulation! Emulation uses software to imitate hardware. Virtualization uses a system’s actual hardware! Recognize the benefits of virtualization. There are two types of hypervisors: Type 1 (bare metal) Type 2 (hosted) Virtualization doesn’t pretend to be anything that it’s not! (Remember, virtualization uses a system’s actual hardware!) Virtualization saves power; & it consolidates hardware; & it makes system recovery easy, & it’s handy for IT research! Hypervisor–V.M.M. (Virtual Machine Monitory) the thing that manages & runs the Virtual Machine for us! Type 2 Hypervisor–runs on top of the host OS. Type 1 Hypervisor–runs directly on top of hardware, independent of…

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    Aaron Comments Off on Virtualization & Cloud Computing–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    December 30, 2020

    Ruby Programming Language Notes

    May 17, 2021

    Local Area Networking—NETWORKING ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 6, 2021
  • Tech

    Wireless, Virtual, Cloud, & Mobile Networking–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 15, 2021 /

    Wireless, Virtual, Cloud, & Mobile Networking Wireless Networking (Note:Ad-hoc networks are Wi-Fi networks comprised only of peer computers.) Intro To 802.11–uses radio waves to transmit info between nodes. A WAP (Wireless Access Point) is a bridging device that connects into an Ethernet network & communicates via radio waves to wireless clients. A WAP has a SSID (Service Set Identifier), a word or phrase used to connect wireless devices to the WAP device. CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is the method used to prevent wireless collisions. Almost all devices & gadgets today have wireless NICs built-in to them! 802.11 Standards Early wireless standards were 802.11b (2.4-GHz) and 802.11a…

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    Aaron Comments Off on Wireless, Virtual, Cloud, & Mobile Networking–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Unary Scope Resolution Operator–Functions–STRUCTURED PROGRAMMING Course Notes

    May 28, 2021

    Some Quick Notes On Python Syntax…

    May 24, 2021

    Building a Real-World Network–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 15, 2021
  • Tech

    Remote Connectivity–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 14, 2021 /

    Remote Connectivity Telephony Technologies Original telephone systems used frequency division multiplexing; today they use time division multiplexing. T1 = 24 DSOs = runs at 1.544 (~1.5) Mbps T3 = 28 DS1s = runs at 44.736 (~45) Mbps [DS1–Digital Signal 1] E1 and E3 are European carriers 64 Kbps Frequency Division Multiplexing Time Division Multiplexing A DS0 can carry 64 kilobits per second! DS1 (digital signal 1)–24 DS0 signals all going down the same wire. this is not Frequency, but Time Division Multiplexing, it uses block & frames, not frequencies. DS1 is just a signal type that runs on something called “T1”. “T1” is a specific type of cabling system. T1…

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    Aaron Comments Off on Remote Connectivity–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Notes to Self 11/05/2020

    May 20, 2021

    How to Get Into Cybersecurity with No Experience [Video]

    December 30, 2020

    Hackers Add a Backdoor to PHP Source Code; 79% of Websites Use PHP

    March 30, 2021
  • Tech

    IPv6–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 14, 2021 /

    IPv6 Intro To IPv6 IPv6 are 128-bits, have a MUCH larger address space than IPv4. IPv6 addresses have 8 segments separated by 7 colons. IPv6 allows data to move much faster through the internet. NDP (Neighbor Discovery Protocol) IPv6 Addressing IPv6 addresses can be shortened by removing leading zeros, but be familiar with the rules. IPv6 addresses have 2 IP addresses: a link-local address & an Internet address. The 2nd part of the IPv6 address using EUI-64 is generated from the MAC address. Link-local address is automatically generated; Internet address is provided by local router. Link-local address starts fe80:0000:0000:0000 (1st four sets) Smallest IPv6 address you can have will be…

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    Aaron Comments Off on IPv6–Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    April 15, 2021

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    Post-Quantum Cryptography: The Race Is On

    March 18, 2021
  • Tech

    Advanced IP Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 14, 2021 /

    Advanced IP Networking Advanced Networking Devices Understand IP Tunneling Very few Internet protocols are encrypted! Tunnels can encapsulate unencrypted protocols to create encrypted communication channels. Tunnels are often used with remote access connections. A tunnel starts by making an encrypted connection between 2 computers. Tunnels are used to provide encryption where there normally isn’t any. They are used to encrypt unencrypted protocols. VPNs (Virtual Private Networks) A VPN creates a secure tunnel so a remote machine or network can be part of a local network. A ‘client-to-client‘ VPN connects a remote computer to a local network. A ‘site-to-site‘ VPN connects distant networks into a single network. Remote Connections Challenges LAN…

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    Blockchain & Money: Session 6: Smart Contracts & DApps by M.I.T. Sloan School of Management with Professor Gary Gensler

    April 15, 2021

    The Essentials of Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 11, 2021

    Vim–The Vi IMproved Text Editor

    December 30, 2020
  • Tech

    TCP/IP Applications–Making TCP/IP Work–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

    May 13, 2021 /

    TCP/IP Applications TCP and UDP Ethernet frames are used by switches & routers. PDU (Protocol Data Units) are the information used by the different protocols provided in frame segments. TCP is connection-oriented, 2-way communication initiated by a 3-way handshake process (syn, syn-ack, ack). UDP is connectionless-oriented protocol, has low overhead with one-way communication. ICMP & IGMP (Note: Ping uses ICMP.) ICMP (Internet Control Message Protocol) works at the Internet (2) Layer in the TCP/IP model, & the network (3) layer in the OSI model. IGMP (Internet Group Management Program) provides multicasting support. Multicast addresses always start with “224”. ex: 224.x.x.x Handy Tools Both ‘tracert’ (Windows), and ‘traceroute’ (Linux) commands display…

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    Aaron Comments Off on TCP/IP Applications–Making TCP/IP Work–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA Network+ (N10-007) NETWORK-PLUS Certification Prep Course Notes

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    Classes: A Deeper Look, Part 2–STRUCTURED PROGRAMMING Course Notes

    May 31, 2021

    The Essentials of Networking–NETWORKING, SECURITY, & MORE ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 11, 2021

    The Visible Computer—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

    May 5, 2021
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