Blog

[10 points] In a CDMA/CD network with a data rate of 10 Mbps, the propagation speed is 2 × 10 8 m/s, the minimum size of an entire frame is 1024 bits for the correct operation of the collision detection process. What should the maximum Ethernet cable length be?

In the peer-to-peer paradigm, a peer is both a client and a server.

[20 points] Given the dataword 0000101001111000 and the divisor 0110111. i. Show the generation of the codeword at the sender site (using binary division). ii. Show the checking of the codeword at the receiver site (assume no error).

In __________compression, the integrity of the data _____ preserved because compression and decompression algorithms are exact inverses of each other.

During an FTP session the control connection is opened _______.

[20 points] A Reno TCP station is now in the slow-start state with cwnd = 4 MSS and ssthresh = 8 MSS. Show the values of cwnd, sstresh, and the current and the next state of the station after the following events: five consecutive nonduplicate ACKs arrived, followed by five duplicate ACKs, followed by two nonduplicate ACKs, and followed by a time-out.

[10 points] Assume a system uses five protocol layers. If the application program creates a message of 1000 bytes and each layer (including the fifth and the first) adds a header of 20 bytes to the data unit, what is the efficiency (the ratio of application-layer bytes to the number of bytes transmitted) of the system?

[10 points] A sender has two data items to send: (5562)16 and (BA98)16. What is the value of the checksum? (5562)16 and (BA98)16 are the hexadecimal representations of data items.

[2.5 points each] Assuming odd parity, find the parity bit for each of the following data items. i. 1001011;ii. 0001100; iii. 0000010; iv. 1100111.

[10 points] What is the rate of a low-pass signal with a bandwidth of 200 kHz sampled using 500 levels of quantization?