3. Fill in the blanks. a) The function of a order to provide for an orderly and efficient use of that capacity. protocol is to control access to the transmission medium in Answer: b) A generic term for sharing the capacity of a data link is Answer: c) The simplest error-detecting scheme is to append a data. bit to the end of a block of Answer:

3. Fill in the blanks. a) The function of a order to provide for an orderly and efficient use of that capacity. protocol is to control access to the transmission medium in Answer: b) A generic term for sharing the capacity of a data link is Answer: c) The simplest error-detecting scheme is to append a data. bit to the end of a block of Answer:

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter9: Computer Networks

Section: Chapter Questions

Problem 10VE

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The following character encoding is used in a data link protocol: A: 01000111; B: 11100011; FLAG: 01111110; ESC: 11100000 Show the bit sequence transmitted in binary for the four character frame: A B ESC FLAG when each of the following framing methods is used: a) Character count b) Flag bytes with byte stuffing c) Starting and ending flag bytes, with bit stuffing. Please solve within 30 minutes. Asap.
3. The following character encoding is used in a data link protocol: A: 01000111; B: 11100011; FLAG: 01111110; ESC: 11100000 Show the bit sequence transmitted in binary for the four character frame: AB ESC FLAG when each of the following framing methods is used: 1.Character count 2.Flag bytes with byte stuffing 3.Starting and ending flag bytes, with bit stuffing.
For NAT Network Address Translation Scenario: Jenny Bello is a small business owner selling and making customized computer peripherals. She has been finding it difficult to track her sales and inventories, however recently after an expert's advice, she adopted a Point of Sale (PoS) server. So, she can now track her sales and inventories at the store. However, she ran into another issue, the server can only be accessed within the store, because it has been assigned a private IPv4 address, it is not publicly accessible via the Internet. a) Why is not having the PoS server accessible over the Internet a problem for the business? b) What caused this problem? c) Propose a solution for the problem and explain how the solution works.
(c) Sender A sends the word A+ to Receiver B. By using Cyclic Redundancy Check (CRC), with divisor 1010, demonstrate clearly how error detection process will take place in data link layer. (Note: Please introduce an error in your received frame to demonstrate the error and error-free process). (Refer Appendix A to solve).
4. In this problem, you will derive the efficiency of a CSMA/CD-like multiple access protocol. In this protocol, time is slotted and all adapters are synchronized to the slots. Unlike slotted ALOHA, however, the length of a slot (in seconds) is much less than a frame time (the time to transmit a frame). Let S be the length of a slot. Suppose all frames are of
Computer Science The following character encoding is used in a data link protocol: A: 11100011 B: 01000111 FLAG (start and end character): 01111110 ESC: 00000111 Displays the transmitted bit sequence for the frame: A B ESC FLAG when using each of the following delimitation methods: (a) Delimitation by length (in this case, counting bytes) (b) Delimitation by character of beginning and end (c) hyphenation (bit stuffing)
For the following two (2) questions, assume that the link layer uses the flag bits with bit stuffing approach for framing, with the following details: The beginning and end of a data frame are indicated by the special flag bits 01111110 (i.e., 0x7E). To handle accidental occurrence of the flag bits within the data, a 0 bit is stuffed every time 5 consecutive 1s are found in the data. For simplicity, assume that no other header/trailer information is added to the data. 1. The following bit stream represents data that needs to be framed by the link layer on the sender’s side. Derive the resultant bit stream by adding necessary flag bits and performing bits stuffing. 0111110001010011111111100101111111111110 2. The following bit stream represents data received by the link layer of a computer. For simplicity, assume that there are no errors in the bit stream. Retrieve the original data from this received bit stream. 01111110010111101111101100101001111101101111110
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?
h. The technique of temporarily delaying outgoing acknowledgements so that they can be hooked onto the next outgoing data frame is called
O Differentiate between error detection and error correction. A bit string needs to be 0110111111100111110111111111100000 transmitted at the data link layer, what is string actually transmitted after bit stuffing, if flag patterns is 01111110?
d) State all the random access protocols and controlled access protocols. Explain why collision is an issue in random access protocols but not in controlled access protocols.
2. For each of the following, write the ONE correct answer. a) TCP/IP layers are Internet (I), Transport (T), Application (A), Physical (P), Network Interface (N). Which layer deals with modulation in WiFi networks? The layer whose header contains the source MAC address is Answer= Answer= b) The leftmost and rightmost bits in a byte are MSbit and LSbit respectively. For the 2 bytes 10000000 00000001, assume that the first byte is MSbyte and the second byte is LSByte. Assuming that bits are transmitted from left to right, write the transmission order that is bit big endian and byte little endian: Answer= c) Let TP=unshielded twisted pair, CC=coaxial cable, F=fiber, L=lasercommunication. Which of these media Uses a shield for limiting interference Achieves the highest bandwidth across long distances Answer= Answer= d) Of FDMA, CDMA, TDMA and SM (statistical multiplexing), which method is multiplexing primarily based on in LTE networks? Answer= e) Which particular form of FDM is used over…