Suppose Host A is sending a string "SEHS1234" to Host B using UDP. The data consistsof 8 characters only, not include the quotes. Each character is encoded using 8-bit ASCII."SEHS1234"Host AHost BIP addr: 192.168.123.21IP addr: 192.168.123.48Port #:1234Port #:5678(c) State the UDP sockets used by the two hosts.(d) What is the length of the UDP segment sent by Host A?Calls and notifications will vibrate

Answered: Suppose Host A is sending a string…

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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Q1) Suppose you have following two bytes data (although UDP uses a 16-bit word but we use 8-bit here for the sake of simplicity) Byte1: 00110100 Byte2: 01101001 a) Compute the checksum (this checksum is sent by the sender in UDP header) b) In flight (over the network), least significant bit is corrupted to 1 for Byte1, and least significant bit is corrupted to 0 for Byte2. With this data, what checksum will be computed at the receiver side c) If UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field, can the receiver be absolutely certain that no bit error have occurred? Explain. Question 2: a) In Stop and wait protocol, sender wait for ACK before sending next packet. But what if an ACK is dropped in the network and never reached to sender. What sender should do in that case? b) A sender process transmits 100 packets towards destination process. Out of 100, 80 packets successfully reach the destination…
Suppose you have following two bytes data (although UDP uses a 16-bit word but we use 8-bit here for the sake of simplicity) Byte1: 00110100 Byte2: 01101001 Compute the checksum (this checksum is sent by the sender in UDP header) In flight (over the network), least significant bit is corrupted to 1 for Byte1, and least significant bit is corrupted to 0 for Byte2. With this data, what checksum will be computed at the receiver side If UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field, can the receiver be absolutely certain that no bit error have occurred? Explain.
Suppose you have following two bytes data (although UDP uses a 16-bit word but we use 8-bit here for the sake of simplicity) Byte1: 00110100 Byte2: 01101001 a) Compute the checksum (this checksum is sent by the sender in UDP header) b) In flight (over the network), least significant bit is corrupted to 1 for Byte1, and least significant bit is corrupted to 0 for Byte2. With this data, what checksum will be computed at the receiver side c) If UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field, can the receiver be absolutely certain that no bit error have occurred? Explain.
4. [Socket] What is a socket? Suppose a process in Host C has a UDP socket with port number6789. Suppose both Host A and Host B send a UDP segment to Host C with destination portnumber 6789. Will both segments be directed to the same socket at Host C? If so, how will theprocess at Host C know that these two segments originated from two different hosts? 5. [Demultiplex] Define multiplexing and demultiplexing. Briefly explain how TCP demultiplexing isdifferent than UDP demultiplexing. 6. [rdt] Consider a reliable data transfer protocol that uses only negative acknowledgments.Suppose the sender sends data only infrequently. Would a NAK-only protocol be preferable to aprotocol that uses ACKs? Why? Now suppose the sender has a lot of data to send and the end-to-end connection experiences few losses. In this second case, would a NAK-only protocol bepreferable to a protocol that uses ACKs? Why?
There are three hosts X, Y, and Z. Hosts X and Y are located at Central Park and Times Square respectively while Host Z runs at Bryant Park. Assume that Host Z has a UDP socket with port number 8888 and both Host X and Host Y each send a UDP segment to Host Z with destination port number 8888. Will the two segments be sent to the same socket at Host Z? If not, why? If yes, how could Host Z know whether the two segments were sent from Central Park or Times Sqaure respectively?
The following is a dump of a UDP header in hexadecimal format. 0513000D001DF315 a. What is the source port number? b. What is the destination port number? c. What is the total length of the user datagram? d. What is the length of the data? e. Is the packet directed from a client to a server or vice versa? f. What is the client process?
QUESTION 19 Suppose a process in Host C has a UDP socket with port number 4320. Suppose both Host A and Host B each send a UDP segment to Host C with destination port number 4320. Then both of these segments will be directed to the same socket with port number 4320 at Host C True False QUESTION 20 With TCP’s flow control mechanism, where the receiver tells the sender how much free buffer space it has (and the sender always limits the amount of outstanding, unACKed, in-flight data to less than this amount), it is not possible for the sender to send more data than the receiver has room to buffer. True False
Scenario There is design1.csv file attached to this router interfaces ip_on_interfaces R1 s1, fa1 10.0.2.1, 192.168.1.3 R2 s0 10.0.2.2, R3 s0, Fa0, s1 10.0.2.3, 192.168.4.3, 192.168.5.5 R4 s0, s2 10.0.2.4, 192.168.8.8, Write a Python script to generate configuration files automatically for each router in the first column. Example, for router R1, the configuration file name should be “r1_config.cfg” and so on. The configuration commands for router R1 are as follows, the other routers’ commands are similar, according to the design file: #configure terminal # hostname R1 # enable secret Pas$w0rD # interface s1 # ip address 10.0.2.1 # no shutdown # interface fa0/1 # ip address 192.168.1.3 # no shutdown # end
Consider the UDP header 00 1E A3 10 12 03 00. HOW LONG DOES THE ENTIRE UDP PROCESS TAKE?
A network system has 5 protocol layers. Applications generate messages of length M bytes. At each of the layers, an h-byte header is added. What fraction of the network bandwidth is filled with headers? a. 5h/(5h+M) b. M/(5h+M) c. M/(4h+M) d. 4h/(4h+M)
Consider sending a 2400-byte datagram into a link that has an MTU of 700 bytes. Suppose the original datagram is stamped with the identification number 522. Write down the values of the following IP header fields for each of the generated fragments? a. length b. ID c. fragflag d. offset
Consider the following non-default subnet masks: (a) 255.255.248.0, (b) 255.128.0.0 . To which IP address class do they pertain?Write down the following in CIDR notation: (a) IP: 150.160.170.180, Subnet Mask:255.255.224.0; (b) IP: 75.80.85.90, Subnet Mask: 255.252.0.0 Three stations A, B, C and D are connected to a common Ethernet hub. Their IPaddresses and subnet mask are respectively: 200.100.50.67, 255.255.255.252;200.100.50.7, 255.255.255.248; 200.100.50.138, 255.255.255.240 and 200.100.50.1,255.255.255.254. Determine which among these stations can communicate with eachother. You need to show all detailed workings.

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