15 pointsSave ARSConsider the following scenario in which host 10.0.0.1 is communicating with an external SMTP mail server at IPaddress 128.119.40.186.NAT translation tableWAN side addrLAN side addr(c), 5051(d), 3031S: (e),5051SMTPBD (f.(g)10.0.0.4server138.76.29.7128.119.40.186(a) is the source IP address at A, and its value.S: (a),3031D: (b), 2510.0.0.1A10.0.0.2.1. 138.76.29.710.0.0.3 くV(a) is the source IP address at A, and its valueis(b) is the destination IP at A, and it value is(c) is the WAN side IP address, and it value is(d) is the LAN side IP address, and it value is(e) is the source IP address at B, and its valueis(f) is the destinationvalue is1. 138.76.29.72. 803. 128.119.40.184. 128.119.40.1865. 30316. 138.76.29.7IP address at B, and its7. 258. 10.0.0.1(g) is the destination port number at B, and itsvalue is9. 10.0.0.110.5051

Step 1: Network Scenario DetailsHost 10.0.0.1 is communicating with an external SMTP mail server at…

Answered: 15 points Save ARS Consider the…

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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2.2-7 A detailed Look at an HTTP GET (3). Again, suppose a client is sending an HTTP GET request message to a web server, gaia.cs.umass.edu. Suppose the client-to-server HTTP GET message is the following (same as in previous problem): GET /kurose_ross_sandbox/interactive/quotation2.htm HTTP/1.1 Host: gaia.cs.umass.edu Accept: text/plain, text/html, text/xml, image/jpeg, image/gif, audio/mpeg, audio/mp4, video/wmv, video/mp4, Accept-Language: en-us, en-gb;q=0.1, en;q=0.7, fr, fr-ch, da, de, fi If-Modified-Since: Wed, 09 Sep 2020 16:06:01 -0700 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebkit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11 Does the client have a cached copy of the object being requested? [Note: you can find additional questions similar to this here.] O Yes, because this is a conditional GET, as evidenced by the If-Modified-Since field. O No, because a client would not request an object if it had that object in its cache. O There's not enough…
Suppose a user has a webserver running at a machine with the name www.nadir.edu.net.pk and IP address 10.10.10.10. The authoritative dns address for this web server is with the name dns.nadir.edu.net.pk and with IP address 11.11.11.11. a. Write all the steps involved in inserting this webserver name in the DNS hierarchy. b. Write all the steps involved in retrieving the IP address of www.nadir.edu.net.pk
Download delays for 100 objects (HTTP 1.1 with browser caching). Consider an HTTP 1.1 client and server. The RTT delay between the client and server is 2 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds, as shown below for the first of these 100 requests. initiate TCP connection RTT request file RTT file received time You can assume that any other HTTP message not containing an object sent by the client and server has a negligible (zero) transmission time. Suppose the client makes 100 requests, one after the other, waiting for a reply to a request before sending the next request. 352 secs Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object, assuming the client uses the IF- MODIFIED-SINCE header line, and 50% of the objects requested have not changed since the client downloaded them (before these 100 downloads are performed)? 350 secs 252 secs time to…
Suppose that an organization has taken a private class B network 172.16.0.0/16 and broken it up to multiple subnets using variable length subnet masks. If a host has IP address 172.16.40.10 and subnet mask of 255.255.240.0, The subnet to which the host belongs is in dotted decimal form. The broadcast address for this subnet in dotted decimal form is (Note: not 255.255.255.255). The number of of hosts can this subnet accommodate is (do not include reserved IP addresses). The first (lowest) IP address that can be assigned to a host in this subnet is in dotted decimal form. The last (highest) IP address that can be assigned to a host in this subnet is in dotted decimal form.
Your host has IP address 172.16.1.1. Someone tries to send e-mail from a remote host with IP address 192.168.3.4. If successful, this will generate an SMTP dialogue, consisting of SMTP commands and mail, between the remote user and the SMTP server on your host. Assume that a user on your host tries to send packets for this scenario as shown: Scenario Direction Src Addr Dest Addr Protocol Dest Port Action 1 In 192.168.3.4 172.16.1.1 TCP 25 ? 2 Out 172.16.1.1 192.168.3.4 TCP 1234 ? Rule table: Rule Direction Src Addr Dest Addr Protocol Dest Port Action A In External Internal TCP 25 Permit B Out Internal External TCP > 1023 Permit C Out Internal External TCP 25 Permit D In External Internal TCP > 1023 Permit E Either Any Any Any Any Deny Indicate which packets are permitted or denied, and which rule is used in each case.
2.2-8 A detailed look at an HTTP reply. Suppose now the server sends the following HTTP response message the client: HTTP/1.0 200 OKDate: Wed, 09 Sep 2020 23:46:21 +0000Server: Apache/2.2.3 (CentOS)Last-Modified: Wed, 09 Sep 2020 23:51:41 +0000ETag:17dc6-a5c-bf716880.Content-Length: 418Connection: CloseContent-type: image/html Will the web server close the TCP connection after sending this message?
1- A user clicks on the link www.msn.com/index.html. Accordingly, the browser asks the cache server for this page, which is available at the cache from Wed 01 Jun 2017 22:54:43 GMT and it is modified yesterday. Write the HTTP 1.1 conditional GET request/response messages sent/received by the cache server. The answer must include the TCP connection (telnet) command and the necessary headers (if exist).
5 Internet Protocol version 4 (IPv4) was deployed on 1 January 1983. The addressformat in IPv4 is a 32-bit numeric value often expressed with four octets from theinterval [0, 255] separated by periods. At the time of writing this book, InternetProtocol version 6 (IPv6), with 128 bit-wide addresses, is slowly replacing IPv4. Intheory, how many IP addresses can be assigned in IPv4 and IPv6?
2.2-3 HTTP 1.1 GET with an embedded object. Suppose an HTTP client makes a request to the xx web server. The client has never before requested a given base object, nor has it communicated recently with the xx server. You can assume, however, that the client host knows the IP address of xx Suppose also that after downloading the base file, the browser encounters a jpeg object in the base html file that is stored on xx, and therefore makes another GET request to xx for that referenced jpeg object. How many round trip times (RTTs) are needed from when the client first makes the request to when the base page and the jpeg file are completely downloaded, assuming the time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT and that the time needed to transmit the HTTP GET into the client's link is zero? You should assume that persistent HTTP 1.1 is being used. (You should take into account any TCP setup time required before an…
COM Assume a web browser at a client host (212.13.14.16) wants to send a message to a web server (156.10.10.2) but a firewall at the client's gateway (212.13.14.1) is configured to block all outgoing packets to 156.10.10.2. The client does have access to a VPN application (similar to the one used in the labs) and can use it to connect to a VPN server (130.16.10.2). Describe how the client should set up a tunnel to bypass the firewall so that the web browser can send a message to the web server (156.10.10.2). You must trace the pathway of the message originating at the web browser on the client host and headed to the VPN server explaining how it traverses through different layers (application, transport, network etc.) in the client host and finally reaches the VPN server application. You must also trace the relevant hops (i.e., the IP addresses) the packet navigates through along the way. You need not trace the reply message and you also don't need to focus on the encryption details.…
Using 130.42.0.0/16, I want to create a subnetting scheme that will allow 12 subnets each of which should support up to 500 IP addresses. Given that the number of bits needed for the subnetting scheme, what will be the subnet mask for the subnets?
The text below shows a reply sent from the server in response to a http GET message. What are the first 5 bytes of the document retrieved? HTTP/1.1 200 OK<cr><lf>Date: Tue, 07 Mar 2008 12:39:45GMT<cr><lf>Server: Apache/2.0.52 (Fedora) <cr><lf>Last-Modified: Sat, 10 Dec2005 18:27:46 GMT<cr><lf>ETag: “526c3-f22-a88a4c80”<cr><lf>Accept- Ranges: bytes<cr><lf>Content-Length: 3874<cr><lf> Keep-Alive: timeout=max=100<cr><lf>Connection: Keep-Alive<cr><lf>Content-Type: text/html; charset= ISO-8859-1<cr><lf><cr><lf><!doctype html public “- //w3c//dtd html 4.0 transitional//en”><lf><html><lf> <head><lf> <meta http-equiv=”Content-Type” content=”text/html; charset=iso-8859-1”><lf> <meta name=”GENERATOR” content=”Mozilla/4.79 [en] (Windows NT 5.0; U) Netscape]”><lf> <title>CMPSCI 453 / 591 / NTU-ST550A…

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