281. For 4800 routers, optimal 3-layer hierarchy region/cluster sizes are:

Data Communication and Computer Networks • Routing • UGC NET Paper 2 Computer Science JUN 2013

282. Which address delivers a message to the correct host application?

Data Communication and Computer Networks • Transport Layer • UGC NET Paper 2 Computer Science JUN 2013

283. Hamming distance between 100101000110 and 110111101101 is

Data Communication and Computer Networks • Error detection • UGC NET Paper 2 Computer Science JUN 2013

284. Word 1110001010 with even parity yields encoded

Data Communication and Computer Networks • Error detection • UGC NET Paper 2 Computer Science JUN 2013

285. A binary symmetric channel uses a

Data Communication and Computer Networks • Error models • UGC NET Paper 2 Computer Science JUN 2013

286. The baud rate of standard 10 Mbps Ethernet is?

Data Communication and Computer Networks • Ethernet • UGC NET Paper 2 Computer Science JUN 2013

287. When a mobile phone moves between cells and base station transfers ownership, this is

Data Communication and Computer Networks • Mobile networks • UGC NET Paper 2 Computer Science JUN 2013

288. A signal of 600 baud, 6 bits per symbol, has bit rate

Data Communication and Computer Networks • Modulation • UGC NET Paper 2 Computer Science JUN 2013

289. In a fully connected mesh of n devices there are how many duplex links?

Data Communication and Computer Networks • Network topologies • UGC NET Paper 2 Computer Science JUN 2013

290. Match layers to services: (a) Data link (b) Network (c) Transport (d) Application — (i) Flow control (ii) Node-to-node delivery (iii) Mail services (iv) Routing

Data Communication and Computer Networks • OSI model • UGC NET Paper 2 Computer Science JUN 2013

291. An uncompressed 1024×800 image at 3 bytes/pixel over 10 Mbps Ethernet takes?

Data Communication and Computer Networks • Performance • UGC NET Paper 2 Computer Science JUN 2013

292. Which media is multidrop?

Data Communication and Computer Networks • Physical layer • UGC NET Paper 2 Computer Science JUN 2013

293. The ________ measures relative strengths of two signals or a signal at two points.

Data Communication and Computer Networks • Signal metrics • UGC NET Paper 2 Computer Science JUN 2013

294. Which substitution cipher has one-to-many plaintext‐to‐cipher mappings?

Data Communication and Computer Networks • Classical Ciphers • UGC NET Paper 2 Computer Science JUN 2013

295. Maximum length of CAT-5 UTP cable in Fast Ethernet?

Data Communication and Computer Networks • Ethernet Standards • UGC NET Paper 2 Computer Science JUN 2013

296. In ______ CSMA, after sensing idle, station transmits based on RNG outcome.

Data Communication and Computer Networks • MAC Protocols • UGC NET Paper 2 Computer Science JUN 2013

297. A file downloads over a 56 kbps modem in 2 minutes. Maximum data size?

Data Communication and Computer Networks • Modem Throughput • UGC NET Paper 2 Computer Science JUN 2013

298. A method to provide secure e-mail transmission is called ____.

Data Communication and Computer Networks • Public-Key Cryptography • UGC NET Paper 2 Computer Science JUN 2013

299. The count-to-infinity problem is associated with which routing algorithm?

Data Communication and Computer Networks • Routing Algorithms • UGC NET Paper 2 Computer Science JUN 2013

300. A 10000-char file sent at 2400 bps in 1000-char frames with 48 bits overhead—total overhead time is ________

Data Communication and Computer Networks • Data framing • UGC NET Paper 2 Computer Science JUN 2013