Computer Network Components and Protocols: A Comprehensive Guide
Computer Network Components
Hub
Collects all connections so that the failure of one does not affect the entire network. Two connection types: one for connecting stations and another for connecting with other hubs. Operates at the physical level of the OSI model. Does not analyze information, divide traffic, or disseminate information.
Bridge
Interconnects networks with different topologies and sub-network protocols. Operates at the link level of the OSI model with two different connectors, one for each
Read MoreACP-125 Radiotelephone Procedures for Tactical Networks
ACP-125: Radiotelephone Procedure
Purpose
The ACP-125 radiotelephone procedure is prescribed for use by allied nations in tactical networks, both safe and unsafe. Its purpose is to provide standardized rules for clear, concise, and unambiguous traffic, ensuring accurate data and efficient command and control. It must be assumed that all transmissions are intercepted and can reveal the location of radio signals.
Enemy Threat and EW
This standardized procedure protects against enemy electronic warfare
Read MorePC Hardware Explained: From Storage to Graphics Cards
Features of a Hard Drive
Transfer Mode:
- PIO (Programmed Input/Output): The system uses a microprocessor as an intermediary for data exchange. Speeds include PIO Mode 1 (5.2 MB/s), PIO Mode 2 (8.3 MB/s), PIO Mode 3 (11.1 MB/s), and PIO Mode 4 (16.6 MB/s).
- DMA (Direct Memory Access): This system transfers data between RAM and the hard drive without microprocessor intervention, freeing up the CPU. Ultra DMA systems are commonly used, with speeds like UDMA 16 (16.6 MB/s), UDMA 33 (33.3 MB/s), UDMA 66
Network Topologies and TCP/IP Architecture
Chapter 2: Network Topologies
Star Topology
All nodes connect to a central node, with messages passing through it.
Loop Topology
Nodes connect in a ring, with one node controlling and determining channel access for other nodes.
Mesh Topology
Nodes interconnect in a complex configuration, sharing communication circuits when transmitting. The most commonly used topologies are ring and bus.
Ring Topology
Each node connects to two others. Each node has a repeater with logic circuitry to transmit and manage
Read MoreTransport Layer: TCP vs. UDP – A Deep Dive
1. Transport Layer Operation
The main features of the transport layer are:
- Error Management: Handles and manages transmission errors.
- Multiplexing: Enables multiple applications to share a single network card by sending different data streams.
- Application Tracking: Uses port numbers to identify applications. Incoming packets are directed to the correct application based on their port number.
- Data Segmentation: Divides raw data into smaller segments for transmission. Each segment is numbered for reassembly
OSI Model: Session Layer Services and Functions
1.2.1 Services Offered: Data Interchange
The session layer’s primary function is data exchange. A session, like a transport connection, has three phases: establishment, use, and release. Primitives provided to the presentation layer manage these phases, mirroring those used for transport connections. Often, invoking a session primitive simply invokes the corresponding transport primitive. Despite these similarities, key differences exist, especially in connection release. Transport connections terminate
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