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dldkffh Knowledge Base

website·Indexed 31 days ago

https://dldkffh.github.io/

A collection of technical notes and guides covering network infrastructure (WLAN, VLAN, GETVPN, DMVPN, RAS), security (RSA, IDP, AWS IAM), cloud services (AWS S3, VPC, CloudTrail, CloudWatch, SaaS, PaaS, IaaS), and general IT concepts including test coverage and parallel databases.

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What's inside dldkffh

  1. Overview of WLAN (Wireless Local Area Network) technology

    WLAN is a technology that connects two or more devices using wireless signal transmission methods, typically utilizing spread spectrum or Orthogonal Frequency Division Multiplexing (OFDM). It allows users to maintain network access while moving within a local area. Most modern WLAN technologies are based on the IEEE 802.11 standard and are commonly marketed under the brand name 'Wi-Fi'.

  2. Overview of First-Hop Redundancy Protocols (FHRP)

    First-Hop Redundancy Protocols (FHRPs) provide redundant and transparent gateway connectivity for a sub-network. They allow two or more routers to back up a specific address, ensuring that if the active default gateway fails, a backup router can take over within seconds to minimize service disruption (Failover) and distribute network load (Load balancing). The 'First Hop' refers to the default router that a PC first sends traffic to on a network.

  3. Overview of Project Management Professional (PMP) Certification

    The Project Management Professional (PMP) is an international certification in project management hosted by the Project Management Institute (PMI), a US-based non-profit organization. It is similar in scope to PRINCE2 and is designed for project managers responsible for the smooth operation of system development plans. The certification ensures that practitioners possess systematic project management (PM) techniques. To be eligible for the exam, candidates must have at least 4,500 hours of practical project management experience.

  4. Overview of Software Design Patterns

    Design patterns are reusable design templates and best practices used in software engineering to solve recurring problems efficiently. They provide a standardized way to design software, which improves code readability, maintainability, and scalability. Key benefits include reduced development time by using proven solutions and providing a common language for team communication.

  5. Overview of Other IEEE 802 Wireless and Network Standards

    Additional IEEE 802 standards include:

    • 802.16 (WiMax): Wireless broadband standard for Metropolitan Area Networks (WMAN).
    • 802.18 (RR-TAG): Radio Regulatory Technical Advisory Group coordinating radio-based systems (WLAN, WPAN, WMAN, etc.).
    • 802.19 (WC-TAG): Wireless Coexistence Technical Advisory Group for unlicensed wireless networks.
    • 802.20 (MBWA): Mobile Broadband Wireless Access (no longer under development).
    • 802.21: Algorithms for seamless handovers between different networks.
    • 802.22 (WRAN): Wireless Regional Area Networks using TV white space frequency bands.

  6. Overview of additional AWS security services

    AWS provides several specialized security services for different use cases:

    • Amazon Inspector: An automated security assessment service to improve security and compliance of deployed applications.
    • Amazon Macie: A data security and privacy service that uses machine learning and pattern matching to discover and protect sensitive data in AWS.
    • Amazon GuardDuty: A threat detection service that continuously monitors AWS accounts, workloads, and S3 data for malicious activity or unauthorized behavior.
    • Amazon Cognito: Provides quick implementation of user sign-up, sign-in, and access control for web and mobile apps.
    • Amazon Detective: Helps analyze and identify the root cause of potential security issues or suspicious activities.

  7. Overview of IEEE 802 LAN/MAN Standards

    IEEE 802 is a family of standards developed by the Institute of Electrical and Electronics Engineers (IEEE) that governs Local Area Networks (LAN) and Metropolitan Area Networks (MAN).

  8. Overview of Cisco GETVPN (Group Encrypted Transport VPN)

    Cisco GETVPN (Group Encrypted Transport VPN) is a VPN technology designed to provide secure and scalable connectivity for large-scale deployments and multiple sites. It utilizes a group-based encryption mechanism to encrypt site-to-site traffic, enabling efficient and scalable encryption across the entire network. This solution is particularly suited for deployments with high bandwidth requirements and complex routing environments.

  9. Overview of General Packet Radio Service (GPRS)

    GPRS is a packet-based data service used in 2G and 3G networks. Unlike the older Circuit Switching method (which reserved a dedicated line), GPRS uses Packet Switching, dividing data into small packets to use network resources more efficiently.

    Key capabilities include:

    • Early mobile internet access (web browsing, email) with theoretical speeds up to 114kbps.
    • Support for Multimedia Messaging Service (MMS) for sending photos, video, and audio.
    • International roaming support via the GPRS Roaming Exchange (GRX) backbone network.

  10. Overview of the RSA Public Key Cryptosystem

    RSA is a public-key cryptosystem developed in 1978 by Ron Rivest, Adi Shamir, and Leonard Adleman. It was the first algorithm capable of both data encryption and digital signatures, making it widely applicable for e-commerce and authentication. Unlike symmetric-key algorithms, RSA allows anyone to encrypt a message using a public key, but only the holder of the corresponding private key can decrypt and read the message.

  11. Understand Platform as a Service (PaaS) characteristics

    PaaS provides cloud components and frameworks used for developing, customizing, testing, and deploying applications quickly and cost-effectively. The provider (third-party or internal) manages the OS, virtualization, servers, storage, networking, and the PaaS software itself. The user is responsible for managing the Applications and Data. Examples include AWS Elastic Beanstalk, Heroku, and Red Hat OpenShift.

  12. Understand IEEE 802.1 Networking and Bridging Standards

    IEEE 802.1 focuses on LAN/MAN architecture, networking between LAN/MAN/WAN, connection security, network management, and protocol layers above MAC & LLC. Key sub-standards include:

    • 802.1D: Ethernet MAC bridging standard including Spanning Tree Protocol (STP). Note: Expected to be formally deprecated in 2022.
    • 802.1Q: Standard for Virtual LANs (VLANs) on a single Ethernet network, defining VLAN tagging and bridge/switch procedures. Includes IEEE 802.1p for QoS priority and defines GARP.
    • 802.1aq: Shortest Path Bridging (SPB), designed to simplify the development and configuration of carrier, enterprise, and cloud networks using multi-path technology.