HostA has established a TCP connection with HostB in a remote network. HostA is sending segments to HostB. Assume we have configured TCP, somehow, to ACK every segment (no ACKing every other segment). Assume that the timeout is the same for all packets. HostB's “window size" is 20000 bytes. HostB has already received and acknowledged everything sent by HostA's application up to and including byte #3,091. HostA now sends segments of the same application data stream in order: P: 489 bytes Q: 217 bytes R: 222 bytes What is the sequence number on segment R?

HostA has established a TCP connection with HostB in a remote network. HostA is sending segments to HostB. Assume we have configured TCP, somehow, to ACK every segment (no ACKing every other segment). Assume that the timeout is the same for all packets. HostB's “window size" is 20000 bytes. HostB has already received and acknowledged everything sent by HostA's application up to and including byte #3,091. HostA now sends segments of the same application data stream in order: P: 489 bytes Q: 217 bytes R: 222 bytes What is the sequence number on segment R?

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

See similar textbooks

Similar questions

Let's pretend Host C is running a Web server on port 80. Suppose this Web server allows both Hosts A and B to make persistent connections. Is it possible that Host C is sending several requests over the same socket? Does port 80 exist in each of these connections if they are being sent through separate sockets? You should discuss and elaborate on this.
Let's pretend Host C is running an HTTP server on port 80. Consider that this Web server allows both Host A and Host B to establish persistent connections. Does Host C always send requests using the same socket? Does port 80 exist on both ends if they travel across separate sockets? You ought to discuss and elaborate on the matter.
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 3 hosts (A , B and C) where A is running 3-TCP process, B has 1-TCP process and C is running 2-UDP process all process are trying to connect to a web server to download a file . How many new socket(s) will be created at the server side? Explain why?
Suppose that a Web server runs in Host C on port 80. Suppose this Web server uses persistent connections, and is currently receiving requests from two different Hosts, A and B. Are all of the requests being sent through the same socket at Host C? If they are being passed through different sockets, do both of the sockets have port 80? Discuss and explain.
Suppose Client A initiates a Telnet session with Server S. At about the same time, Client Balso initiates a Telnet session with Server S. Provide possible source and destination portnumbers for If A and B are different hosts, is it possible that the source port number in the segments from A to S is the same as that from B to S?
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
Assume a web server can only receive TCP connections on port 80 (HTTP) and 22 (SSH), but not on any other ports. The web server can only establish connection to a database server hosted on private IP 192.168.100.100 on port 3000, but to no other machines inside or outside the network. Imagine this web server is running Linux, and we’re using iptables to define host-based firewall rules for it. Show the set of iptables commands to install necessary rules for this security policy.
True or false? Host A is sending Host B a large file over a TCP connection. Assume Host B has no data to send Host A. Host B will not send acknowledgments to Host A because Host B cannot piggyback the acknowledgments on data.
Let's say Host C is a Web server that listens on port 80. Assume that this web server allows persistent connections and that it accepts requests from hosts A and B. Is Host C using the same socket to transmit each request? If they're broadcast over different sockets, do they both have port 80? You should talk about it and provide an explanation.
In this problem, we use the useful dig tool available on Unix and Linux hosts to explore the hierarchy of DNS servers. Recall that in Figure 2.19, a DNS server in the DNS hierarchy delegates a DNS query to a DNS server lower in the hierarchy, by sending back to the DNS client the name of that lower-level DNS server. First read the man page for dig, and then answer the following questions. Starting with a root DNS server (from one of the root servers [a-m].root-servers.net), initiate a sequence of queries for the IP address for your department’s Web server by using dig. Show the list of the names of DNS servers in the delegation chain in answering your query. Please tell me how I should use dig and which part of output I should write for answer this question, best with picture example, thank you!
Assume Host C has a Web server on port 80. The Web server is receiving requests from two separate hosts, A and B. Are all queries forwarded to Host C using the same socket? Do both sockets have port 80 if they are passed through different sockets? How to explain?