The subnet mask in binary format: 255.255.255.240 is ● 11111111.11111111.11111111.11111000 11111111.11111111.11111111.11110000 11111 1.11111111.11111111.11111100 O 11111111.1111 1111.11111110 * The system that mimics exact behavior of :another system is Emulator Simulator SOI IOS : The non-intelligent network device is Hub Network cloud O

The subnet mask in binary format: 255.255.255.240 is ● 11111111.11111111.11111111.11111000 11111111.11111111.11111111.11110000 11111 1.11111111.11111111.11111100 O 11111111.1111 1111.11111110 * The system that mimics exact behavior of :another system is Emulator Simulator SOI IOS : The non-intelligent network device is Hub Network cloud O

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Computer Science The network administrator in your organization connects the PCs so that they are connected logically to each other in the form of a ring and tokens govern the access of PCs. A token is a special bit pattern or a small message, which circulates from one PC to the next in one direction. The token is passed from one PC to another adjacent PC in the ring. In both cases, a token represents permission to send. If a PC has a frame queued for transmission when it receives the token, it can send that frame and use the medium alone before passing it to the next PC. If it has no queued frame, it passes the token simply to the next PC. Analyze this scenario and mention the name of this media access control and discuss the reason for your answer
Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzi. Suppose you have an LFSR with 6 state bits. The first 12 bits of output produced by this LFSR are 101011100010 = 80818283848586878889810811- The first bit produced is the leftmost bit and the bit most recently produced is the rightmost bit. a) What is the initial state of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent 85 = 0, $4 = 1, 83 = 0, 82 = 1, 81 = 0, 80 = 1). b) What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent p = 0, P₁ = 1, P3 = 0, P2 = 1, P₁ = 0, Po = 1).
When a file is transferred between two computers, two acknowledgement strategies are possible. In the first one, the file is chopped up into packets, which are individually acknowledged by the receiver, but the file transfer as a whole is not acknowledged. In the second one, the packets are not acknowledged individually, but the entire file is acknowledged when it arrives. Discuss these two approaches.
TCP is a sliding window protocol. This means... а. the TCP retransmission timer slides up as ACKS are received. O b. there can be more than one segment "in flight" (sent but no ACK has been received) at a time. с. there can only be one segment outstanding (sent but no ACK has been received) at at time.
Suppose Alice and Bob are going to communicate using AES in CBC mode. Unfortunately Alice's message length (in bytes) is not a multiple of 16. Suppose the last block of her message is just a single zero byte. How can she pad out the last block so that she can use CBC mode? Since this needs to be a reversible operation, how does Bob recognize the padding and remove it?
25. When a file is transferred between two computers, two acknowledgement strategies are possible. In the first one, the file is chopped up into packets, which are individually acknowledged by the receiver, but the file transfer as a whole is not acknowledged. In the second one, the packets are not acknowledged individually, but the entire file is acknowledged when it arrives. Discuss these two approaches.
For each of the following sets of codewords, please give the appropriate (n,k,d) designation where n is number of bits in each codeword, k is the number of message bits transmitted by each code word and d is the minimum Hamming distance between codewords. Also give the code rate. {111, 100, 001, 010}
Computer A uses the Go-back-N ARQ protocol to send a 110 Mbytes file to computer B with a window size of 15. Given each frame carries 100K bytes data. How long does it take to send the whole file (the total time taken from A sending the first bit of the file until A receiving the last acknowledgment)? Given that the transmission rate of the link is 500 Mbps and the propagation time between A and B is 15ms. Assume no data or control frame is lost or damaged and ignore the overhead due to header and trailer.
The following string corresponds to a message encoded in UTF-8 format:f09fa4b7e29a93c3b72fExpress the message in a format understandable to a human.
Problem with constructing MAC. The messages X to be authenticated consists of z independent blocks, so that: X = x1||x2|| . . . ||xz, where every xi consists of |xi| = 8 bits. The input blocks are consecutively put into the compression function ci = h(ci−1, xi) = ci−1⊕xi At the end, the MAC value: MACk(X) = cz+k mod 28 is calculated, where k is a 64-bit long shared key. Describe how exactly the (effective part of the) key k can be calculated with only one known message X.
Two digitally signed messages have been left at a crime scene: 29768868867244873648488957219522558787 12920188055367022129554427445497541055841e651 There are three suspects: Athena, Circe, and Hera. You know the public encryption key of each Greek goddess: Athena's public key is: e: 6466019662815240416609191 n: 173192591513190928117975841552744585022718219 Circe's public key is: e: 302824035249433 n: 7234535030236e87177993172048327e867057 and Hera's public key is: e: 178481477e68456379e179 n: 2752429918e519147582209432990633756871 What is the name of the goddess who claims to be innocent? What is the name of the goddess who claims she commited the crime?
Encoding a message starts with assigning each letter of the alphabet with a positive integer using a specific pattern, thus rewriting the original message as a list of numbers instead of words. Decoding a message is the process that "undoes" the encoding process. ASsume that the table below was used to encode an important secret message. Z- 26 A - 1 В - 2 С — 3 D- 4 E- 5 U-21 V- 22 W- 23 F-6 К-11 P- 16 Blank - 27 G-7 H-8 L-12 M- 13 Q-17 R- 18 |- 1-9 N- 14 S-19 X-24 J- 10 О-15 T-20 Y-25 You intercepted the following encoded message from Boris and Natasha. 25 19 19 30 41 17 15 26 27 41 15 28 18 41 18 29 41 34 22 19 41 27 15 34 22 You do not know the encoding or decoding function, but you know this message consists of 6 words. Using the encoding system described above, answer the following questions. Analysis 1. From previous work with Boris and Natasha, you know that their encoding and decoding functions are always linear and have 1 as the coefficient of x. Write the general form of the…