Data Link Layer: Framing, ARQ, HDLC, PPP, Channel Access and Ethernet Explained
Unit 2: Data Link Layer, Complete Notes with Solved PYQs
Your exam is today, so the ★ boxes (exam-ready answers) and the PYQ solutions come first in priority. Read the basics only if you have time.
One correction to the earlier numbers: the 1 Mbps / 20 ms question has two valid answers. The textbook method (Forouzan, which the paper’s wording follows) gives 5% and 75%. The formula Tₜ/(Tₜ+RTT) gives 4.76% and 71.4%. Write the textbook method in the exam and add the formula as a one-line remark.
Read MoreComplete JavaScript Roadmap and Topic-Wise Tutorial
JavaScript Complete Topic-Wise Explanation
1. JavaScript kya hai?
JavaScript ek programming language hai jo website ko interactive aur dynamic banati hai.
Simple example:
- HTML → Website ka structure
- CSS → Website ka design
- JavaScript → Website ka behavior/functionality
Example: Button click karne par text change karna.
Click Me
Hello
2. JavaScript ko HTML me add karna
Internal JavaScript
External JavaScript
HTML:
script.js:
console.log("Hello JavaScript");External JS real projects me commonly use hoti
Read MoreC++ Algorithms for Binary Search and Prefix Sums
C++ Competitive Programming Solutions
This document contains several C++ solutions for common algorithmic problems involving prefix sums, binary search, and matrix manipulation.
1. Prefix Sum and Lower Bound Algorithm
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
long long k;
cin >> n >> k;
vector<long long> pref(n + 1, 0);
for (int i = 1; i <= n; i++) {
long long x;
cin >> x;
pref[i] = pref[i - 1] C++ Algorithms and Binary Search Implementation Codes
C++ Binary Search and Algorithms Collection
1. Binary Search Implementation
#include <iostream>
using namespace std;
int main(){
int n;
cin >> n;
int a[100000];
for (int i = 0; i < n; i++)
cin >> a[i];
int x;
cin >> x;
int l = 0, r = n - 1;
while (l <= r) {
int m = (l + r) / 2;
if (a[m] == x) {
cout << "Yes";
return 0;
}
if (a[m] < x)
l = m + 1;
Altair Cheat Sheet Python: Data Visualization Reference
Altair Cheat Sheet Python
01 Build a chart
1. Import + general pattern
import altair as alt
chart = (
alt.Chart(data).mark_…()
.encode(x=…, y=…, color=…)
.transform_…(…).properties(…)
.interactive()
)
2. Choose a chart type
mark_bar bars / aggregated comparison
mark_line trends over an ordered axis
mark_circle scatter plots
mark_area filled trends / totals
mark_rect heat maps
mark_arc pie or donut charts
mark_boxplot distribution summaries
mark_geoshape
Essential Web Development and Java Networking Concepts
CSS Box Model Explained
Every HTML element is treated as a rectangular box made up of four layers, from inside out:
┌─────────────────────────────┐
│ MARGIN │
│ ┌─────────────────────────┐ │
│ │ BORDER │ │
│ │ ┌─────────────────────┐ │ │
│ │ │ PADDING │