Understanding IP Address Spaces and Common Ports

Posted by on Feb 11, 2025 in Computer Engineering | 0 comments

Understanding IP Address Spaces

Private IPv4 Address Spaces

The following table lists the private IPv4 address spaces:

Address BlockDescription
127.0.0.0/8Loopback
192.168.0.0/16Private Network
10.0.0.0/8Private Network
100.64.0.0/10Shared address space[4] carrier-grade NAT.
172.16.0.0/12Private Network (172.16.0.0–172.31.255.255)

Special Use IPv4 Addresses

These addresses are reserved for specific purposes:

Address BlockDescription
224.0.0.0/4IP multicast.[10] (Former Class D network.)
240.0.0.0/4Reserved
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Communication Channels and Technologies

Posted by on Feb 8, 2025 in Computer Engineering | 0 comments

Communication Channels

A communication channel routes messages from sender to receiver. Channels can be guided (e.g., copper wires, optical fiber) or unguided (e.g., air, vacuum).

Types of Communication Channels

  • Dedicated Links: Establish an exclusive channel between two interlocutors.
    • Point-to-Point: One sender and one receiver.
    • Multipoint: Multiple callers at either end.
  • Shared Networks: Callers connect to a network node to contact others.
    • Dissemination (Broadcast): Transmitter sends data to multiple
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Java Code Examples: Backpack & Maximum Subarray

Posted by on Feb 8, 2025 in Computer Engineering | 0 comments

Backpack Problem Implementation in Java

This code implements a solution to the Backpack problem using a depth-first search approach. The Alforja class represents the backpack and its contents.


public class Alforja implements Solution {
    private ArrayList<Integer> pesos;
    private ArrayList<Integer> valors;
    private ArrayList<Integer> alforja;
    public static int MAXPES = 0;

    public Alforja() {
        pesos = new ArrayList<>();
        valors = new ArrayList&
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Satellite Communication and Radio Wave Fundamentals

Posted by on Feb 5, 2025 in Computer Engineering | 0 comments

Iridium Satellite Constellation

Iridium is the name of a constellation of 66 communications satellites orbiting the Earth in 6 low Earth orbits (LEO), each consisting of 11 evenly spaced satellites. Its name comes from the element Iridium, which has an atomic number of 77, equivalent to the number of satellites in the constellation, including its original design.

Radio Wave Fundamentals

Frequency

Frequency is a measure that is generally used to indicate the number of repetitions of any phenomenon or

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Market Entry and Game Theory: Incumbent vs. New Entrant

Posted by on Feb 3, 2025 in Computer Engineering | 0 comments

Market Entry and Strategic Interaction: A Game Theory Perspective

**a) Payoffs with c=0**

There are three possible outcomes of the game, depending on the choices of the new entrant (entry vs. no entry) and of the incumbent firm (aggressive vs. passive behavior). In case of no entry, the incumbent will set the monopolist level of output. Let i be the incumbent label and e the new firm label. The monopolist quantity is qmi = 1/2 and the payoffs are Πmi = 1/4 and Πme = 0.

If the new firm enters the

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Network Simulation and Data Security: Practical Implementations

Posted by on Jan 31, 2025 in Computer Engineering | 0 comments

1. Implementing a Three-Node Point-to-Point Network

This section demonstrates a three-node point-to-point network with duplex links. We will set the queue size, vary the bandwidth, and determine the number of packets dropped.

TCL Script

set ns [new Simulator]
set nf [open lab1.nam w]
$ns namtrace-all $nf
set tf [open lab1.tr w]
$ns trace-all $tf

proc finish { } {
global ns nf tf
$ns flush-trace
close $nf
close $tf
exec nam lab1.nam &
exit 0
}

set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
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