341. Match (Session, App, Presentation, Transport) to codes a b c d.

Data Communication and Computer Networks • OSI Model • UGC NET Paper 2 Computer Science AUG 2016

342. Network 10 Mb/s, 12 000 frames/min ×10 000 bits each. Throughput?

Data Communication and Computer Networks • Performance Analysis • UGC NET Paper 2 Computer Science AUG 2016

343. Transmission=32 kbps, 8 hops, packet=8000 bits. Total end-to-end delay =?

Data Communication and Computer Networks • Performance analysis • UGC NET Paper 2 Computer Science AUG 2016

344. Statements A. Ethernet over fiber. B. PPPoE encapsulates PPP in Ethernet. C. Ethernet not over fiber. D. PPPoE encapsulates Ethernet in PPP. Which correct?

Data Communication and Computer Networks • Protocols • UGC NET Paper 2 Computer Science AUG 2016

345. Slotted ALOHA, 200-bit frames, 200 kbps, 1000 frames/sec. Throughput =?

Data Communication and Computer Networks • Random access • UGC NET Paper 2 Computer Science AUG 2016

346. Attacker captures and replays info without alteration. This is?

Data Communication and Computer Networks • Security • UGC NET Paper 2 Computer Science AUG 2016

347. Which is FALSE about microwaves?

Data Communication and Computer Networks • Wireless Media • UGC NET Paper 2 Computer Science AUG 2016

348. If N users share secret-key encryption, number of keys required is?

Data Communication and Computer Networks • Cryptography – Symmetric Keys • UGC NET Paper 2 Computer Science AUG 2016

349. 100 pages/min, 24 lines×80 chars×8 bits/char. Required bit rate?

Data Communication and Computer Networks • Data Rate Calculations • UGC NET Paper 2 Computer Science AUG 2016

350. Encrypt “EXTRANET” by columnar transposition with key 3 5 2 1 4 using ‘Z’ padding. Cipher text is:?

Data Communication and Computer Networks • Data Security: Transposition Cipher • UGC NET Paper 2 Computer Science AUG 2016

351. Match: (a) Line coding (b) Block coding (c) Scrambling (d) PCM → (i) analog→digital (ii) sync without extra bits (iii) digital data→digital signal (iv) redundancy+error detection.

Data Communication and Computer Networks • Digital Transmission Techniques • UGC NET Paper 2 Computer Science AUG 2016

352. Which statements about multiplexing are correct? A. FDM applies when link BW > sum signals BW. B. WDM is analog. C. WDM is digital. D. TDM is digital.

Data Communication and Computer Networks • Multiplexing Techniques • UGC NET Paper 2 Computer Science AUG 2016

353. If link transmits 4000 frames/s and each slot has 8 bits, TDM circuit rate is:

Data Communication and Computer Networks • Multiplexing: TDM Rate • UGC NET Paper 2 Computer Science AUG 2016

354. In fully-connected mesh with 10 nodes, cables needed and ports per device?

Data Communication and Computer Networks • Network Topologies • UGC NET Paper 2 Computer Science AUG 2016

355. Optical fiber uses reflection; angle of incidence must be ____ critical angle.

Data Communication and Computer Networks • Optical Communication • UGC NET Paper 2 Computer Science AUG 2016

356. Pure ALOHA with 200-bit frames at 200 Kbps, system generates 500 fps. Throughput is:

Data Communication and Computer Networks • Random Access Protocols • UGC NET Paper 2 Computer Science AUG 2016

357. Attacker captures and replays altered info between client and banker. Attack is?

Data Communication and Computer Networks • Security Attacks • UGC NET Paper 2 Computer Science AUG 2016

358. In TCP/IP model, which layer lets hosts inject packets independently?

Data Communication and Computer Networks • TCP/IP Model • UGC NET Paper 2 Computer Science AUG 2016

359. Multiplexer combining four 100 Kbps channels with 2-bit timeslots yields bit rate of?

Data Communication and Computer Networks • Time-Division Multiplexing • UGC NET Paper 2 Computer Science AUG 2016

360. Which is NOT correct about HTML?

Data Communication and Computer Networks • Web Technologies: HTML • UGC NET Paper 2 Computer Science AUG 2016