Computer Networks Top 20 PYQs | Bihar STET Paper 2 CS Preparation

Networking ke 20 most important Previous Year Questions — OSI Model, TCP/IP, IP Addressing, Port Numbers, Network Devices, Topologies aur Cryptography — har question ka answer aur uske peeche ka concept, diagram ke saath. Bihar STET Computer Science ke liye. Format simple hai: question → 4 options → sochne ka time → correct answer → concept explanation. Video pause kar ke pehle khud try kariye, phir answer dekhiye. 📋 ISS VIDEO KE 20 QUESTIONS OSI MODEL & LAYERS • Logical addressing aur routing kis layer ka kaam hai? → Network Layer • End-to-end flow control aur error-free delivery? → Transport Layer • Digital bits ko signals mein kaun badalta hai? → Physical Layer • Data link layer ke data units kya kehlate hain? → Frames IP ADDRESSING • IPv4 aur IPv6 ka size? → 32 bits aur 128 bits • Class B ka default subnet mask? → 255.255.0.0 • Subnet mask ka kaam kya hai? → Network aur Host portion alag karna PROTOCOLS & PORTS • Connection-oriented reliable transport protocol? → TCP • DNS ka default port? → 53 • HTTP port 80 hai, to HTTPS? → 443 • Dynamic IP address kaun assign karta hai? → DHCP NETWORK DEVICES • Switch kis layer par kaam karta hai? → Layer 2, Data Link • Alag protocols wale networks ko kaun jodta hai? → Router / Gateway • Hub broadcast device hai — kis layer par? → Physical Layer • NIC ka physical address? → MAC address, 48 bits TOPOLOGIES • Single central backbone cable wali topology? → Bus • Full mesh mein n devices ke liye links? → n(n − 1) / 2 ERROR DETECTION & SECURITY • Generator polynomial aur binary division? → CRC • Traffic ko rules ke hisaab se monitor karne wala system? → Firewall • RSA kis type ki cryptography hai? → Asymmetric / Public Key 💡 RAPID REVISION — Routing = Network Layer · Frames = Data Link · IPv6 = 128 bits · Class B = 255.255.0.0 · DNS = 53 · HTTPS = 443 · Switch = Layer 2 · Hub = Layer 1 · MAC = 48 bits · Full mesh = n(n−1)/2 · CRC = polynomial division · RSA = asymmetric ⏱️ CHAPTERS 0:00 Intro — format aur topics 0:34 Q1 OSI — logical addressing aur routing 1:20 Q2 OSI — end-to-end flow control 2:11 Q3 OSI — bits se signals 2:51 Q4 Data link layer ke data units 3:21 Q5 IPv4 vs IPv6 — address size 3:59 Q6 Class B ka default subnet mask 4:52 Q7 Subnet mask ka purpose 5:41 Q8 Connection-oriented transport protocol 6:21 Q9 DNS ka port number 6:52 Q10 HTTPS ka port number 7:17 Q11 Switch — kaun si layer 7:55 Q12 Alag networks ko jodne wala device 8:44 Q13 Hub — kaun si layer 9:27 Q14 Bus topology — backbone cable 10:00 Q15 Mesh formula — n(n − 1) / 2 10:35 Q16 CRC — error detection 11:30 Q17 MAC address — 48 bits 12:04 Q18 Firewall 12:39 Q19 RSA — asymmetric cryptography 13:23 Q20 DHCP — dynamic IP 14:10 Outro 📚 KIS KE LIYE HAI Bihar STET Computer Science, TET, teacher recruitment aur dusre competitive exams ki taiyari karne wale students ke liye. ▶️ PLAYLIST — Computer Science for Bihar STET    • Bihar STET Computer Science   Aapka score comment mein zaroor bataiye — 20 mein se kitne sahi hue? Video useful laga to LIKE kariye aur channel SUBSCRIBE kar lijiye. #NetworkingPYQ #BiharSTET#TRE 4.0 #computerscience Related Videos: Bihar STET 2026 Computer Science | Syllabus, Eligibility & Exam Pattern Update BPSC TRE 4.0 Computer Science Aarambh Series BPSC TRE 4.0 Detailed Computer Science Syllabus | BPSC TRE - 4.0 की कैसे करे तैयारी....?