Consider a local network with a 1 Gbps access link to the Internet. Hosts on this network areaccessing resources with an average size of 2 MB from a distant server at an average rate of 50requests per second.a.What is the link utilization of the access link to the internet?b.Suppose these requests were to go through a caching proxy server. What would thelink utilization to the internet be if half of all requests were served from the cache of the proxyserver?с.resources never being needed for example.) Would this still provide any advantages to the enduser? Would there be any disadvantages to the end user?Suppose the proxy server could not serve any content from cache (due to the same

The LAN is mainly of two types wired LAN and wireless LAN. The wired LAN uses switches, servers, and…

Consider a local network with a 1 Gbps access link to the Internet. Hosts on this network are accessing resources with an average size of 2 MB from a distant server at an average rate of 50 requests per second. a. What is the link utilization of the access link to the internet? b. link utilization to the internet be if half of all requests were served from the cache of the proxy server? Suppose these requests were to go through a caching proxy server. What would the с. resources never being needed for example.) Would this still provide any advantages to the end user? Would there be any disadvantages to the end user? Suppose the proxy server could not serve any content from cache (due to the same

Consider a local network with a 1 Gbps access link to the Internet. Hosts on this network are accessing resources with an average size of 2 MB from a distant server at an average rate of 50 requests per second. a. What is the link utilization of the access link to the internet? b. link utilization to the internet be if half of all requests were served from the cache of the proxy server? Suppose these requests were to go through a caching proxy server. What would the с. resources never being needed for example.) Would this still provide any advantages to the end user? Would there be any disadvantages to the end user? Suppose the proxy server could not serve any content from cache (due to the same

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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Similar questions

Suppose Host A sends a huge TCP link to Host B. The amount of unrecognized bytes A sends cannot surpass the size of the buffer received. True or false.
Pretend that a client can retrieve a file from a remote server at a known address using UDP. The client first sends a file name request, and the server responds with a series of data packets containing various file components. Client and server utilize a stop-and-wait protocol to assure delivery dependability. Does this protocol have a problem besides obvious performance issues? Consider the potential of process failure?
True or false? Suppose Host A is sending Host B a large file over a TCP connection. The number of unacknowledged bytes that A sends cannot exceed the size of the receive buffer.
Consider a TCP segment originating on a host running a Google Chrome Browser destined for the TU Dublin Webserver: (1) Separately identify how the port numbers are assigned for the client and server applications and, identify the range from which these port numbers are allocated. (ii) Identify the byte order used to represent these addresses within the segment header. (iii) If a port number contained in the segment header is passed to the Application layer, identify the function used to convert it to the correct byte order within the application.
Consider a local area network (LAN) with multiple stations connected to the same bus using the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol for medium access control. Assume that each station has a packet to transmit and follows the CSMA/CD protocol to access the medium. The first station to sense the medium finds it idle and starts transmitting its packet. The second station also senses the medium as idle and starts transmitting its packet, but halfway through the transmission, it detects a collision with the first station’s packet. After detecting the collision, the second station follows the backoff and retransmission procedure specified by the CSMA/CD protocol. Assume that the backoff algorithm uses binary exponential backoff with a maximum number of retries of 10 and that the slot time is 512 bit times. (a) What is the minimum number of slots the second station must wait before attempting to retransmit its packet after detecting the collision? Show…
With persistent communication, a receiver generally has its own local buffer where messages can be stored when the receiver is not executing. To create such a buffer, we may need to specify its size. Give an argument why this is preferable, as well as one against specification of the size.
Packet scheduling. Consider the pattern of red and green packet arrivals to a router's output port queue, shown below. Suppose each packet takes one time slot to be transmitted, and can only begin transmission at the beginning of a time slot after its arrival. Indicate the sequence of departing packet numbers (at t = 1, 2, 3, 4, 5, 6, 7) under FCFS scheduling. Give your answer as 7 ordered digits (each corresponding to the packet number of a departing packet), with a single space between each digit, and no spaces before the first or after the last digit, e.g., in a form like 7 6 5 4 3 2 1). arrivals packet in service departures 234 5 2 ???? ? 67 3 4 5 6 t
NAT translation table LAN side addr WAN side addr 135.122.200.215 10.0.1.15 10,0.1.13 address 135.122.200.215 S: 10,0,1.27 2 D: 1 D: S: S: D: S: 10,0.1.15 D: 135.122,200,215 10.०.1.22
Data collision happens when many senders access the medium at the same time; what protocols are available to avoid this, and at what layer(s) do they function? Using these protocols, is it possible to ensure a transfer that does not include any collisions? In the event that this is not the case, what other possibilities do we have for fixing the issue that we are facing?
Suppose within your web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that three DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTT = 4 msecs. The second and third DNS servers contacted have RTTs of 45 and 24 msecs, respectively. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP = 9 msecs. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? (Do not forget the TCP handshake(s).) 82 msecs O 91 msecs O 46 msecs O 67 msecs
Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rates R1 = 12.8 Mbps, R2 = 4000 kbps, and R3 = 2 Mbps.a. Assuming no other traffic in the network, what is the throughput for the file transfer?b. Suppose the file is 12 million bytes. Dividing the file size by the throughput, roughly how long will it take to transfer the file to Host B?c. Repeat (a) and (b), but now with R2 reduced to 500 kbps.
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