EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Expert Solution & Answer
Chapter 4, Problem P2P
a.
Explanation of Solution
“No” it is not possible to forward the packets through the switch at the same time when the fabric uses shared bus.
Reason:
The two packets had arrived at two different i...
b.
Explanation of Solution
“No” it is not possible to forward the packets through the switch at the same time when the fabric does switching through memory.
Reason:
The two packets had arrived at two different ...
c.
Explanation of Solution
“No” it is not possible to forward the packets through the switch at the same time when the fabric uses crossbar.
Reason:
The two packets had arrived at two different input po...
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Students have asked these similar questions
A workstation uses the HTTP protocol to download a large file from a web server. No proxy server is used. One router's queue is full when one of the web server's packets arrives.Select the four best statements to describe this situationa. The router stores the packet until such time that it can be sent.b. Further packets sent by the server are transmitted at a higher rate to compensate for the lost packet.c. The router sends an ICMP link congested message to the server.d. The packet must be retransmitted.e. Router configuration and network behavior could be improved by configuring FQ or WFQ.f. Further packets sent by the server are transmitted at a lower rate to reduce the load on the congested link.g. Router configuration and network behavior could be improved by configuring RED or WRED.h. A tail drop will happen.
Suppose a router has n input ports each with identical line speeds, n output ports each with identical line speeds, and the line speed of an output port is at least n times as that of an input port. Further suppose that the switching fabric speed is at least n times as fast as an input line speed. Then
A. queuing can occur in an input port.B. queuing can occur in the switching fabric.
C. queuing can occur in an output port.D. there is no queuing delay in the router.
A packet switch receives a packet and determines the outbound link to which the packet should be forwarded. When the packet arrives, one other packet is halfway done being transmitted on this outbound link and four other packets are waiting to be transmitted. Packets are transmitted in order of arrival. Suppose all packets are 1,500 bytes and the link rate is 2 Mbps. What is the queuing delay for the packet? More generally, what is the queuing delay when all packets have length L, the transmission rate is R, x bits of the currently-being-transmitted packet have been transmitted, and n packets are already in the queue?
Chapter 4 Solutions
EBK COMPUTER NETWORKING
Ch. 4 - Lets review some of the terminology used in this...Ch. 4 - Prob. R2RQCh. 4 - Prob. R3RQCh. 4 - Prob. R4RQCh. 4 - Prob. R5RQCh. 4 - Prob. R6RQCh. 4 - Prob. R7RQCh. 4 - Prob. R8RQCh. 4 - Prob. R9RQCh. 4 - Prob. R10RQ
Ch. 4 - Prob. R11RQCh. 4 - Prob. R12RQCh. 4 - Prob. R13RQCh. 4 - Prob. R14RQCh. 4 - Prob. R15RQCh. 4 - Prob. R16RQCh. 4 - Prob. R17RQCh. 4 - Prob. R18RQCh. 4 - Prob. R19RQCh. 4 - Prob. R20RQCh. 4 - Prob. R21RQCh. 4 - Prob. R22RQCh. 4 - Prob. R23RQCh. 4 - Prob. R24RQCh. 4 - Prob. R25RQCh. 4 - Prob. R26RQCh. 4 - Prob. R27RQCh. 4 - Prob. R28RQCh. 4 - Prob. R29RQCh. 4 - Prob. R30RQCh. 4 - Prob. R31RQCh. 4 - Prob. R32RQCh. 4 - Prob. R33RQCh. 4 - Prob. R34RQCh. 4 - Prob. R35RQCh. 4 - Prob. P1PCh. 4 - Prob. P2PCh. 4 - Prob. P3PCh. 4 - Consider a datagram network using 32-bit host...Ch. 4 - Consider a datagram network using 8-bit host...Ch. 4 - Consider a datagram network using 8-bit host...Ch. 4 - Prob. P8PCh. 4 - Prob. P9PCh. 4 - Prob. P10PCh. 4 - Prob. P11PCh. 4 - Prob. P12PCh. 4 - Consider sending a 2400-byte datagram into a link...Ch. 4 - Prob. P15PCh. 4 - Prob. P16PCh. 4 - Prob. P17PCh. 4 - Prob. P18PCh. 4 - Prob. P19PCh. 4 - Prob. P20PCh. 4 - Prob. P21PCh. 4 - Prob. P22P
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Similar questions
- Assume the two packets arrive at about the same time at two separate router input ports. Often assume that there are no other packets in the router a. Suppose that the two packets can be sent to two output ports. Can all packets be forwarded simultaneously via the transfer fabric while the fabric uses a common bus? b. Suppose the two packets can be sent to two separate output ports. Can all packets be forwarded simultaneously via the switch fabric while the fabric uses switching through memory? c.Assume that the two packets should be sent to the same output port. Will the two packets be forwarded simultaneously via the switches while the fabric uses a crossbar?arrow_forwardPlease do not give solution in image format thanku Suppose two packets arrive to two different input ports of a router at exactly the same time. Also suppose there are no other packets anywhere in the router. Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a shared bus? Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses switching via memory? Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar? Suppose the two packets are to be forwarded to the same output port. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar?arrow_forwardSuppose that Router A and Router B are connected via a 0.05 Mbps link (note, 1 Mbps = 106 bps) and that the link connecting the two routers has a length of 80 meters. Suppose that Router A is in the process oftransmitting a packet, and that there are 15 additional packets in the queue of the router, when a new packet arrives at Router A. Assume the followinga. Every packet consists of 15,000 bits.b. 5000 bits of the currently-being-transmitted packet has been transmitted by Router A when the new packet arrives at Router A. c. Propagation speed of a bit over the link connecting the two routersis 2 ? 103 meters/sec.d. Processing delay of a packet at a router takes 1 millisecond (i.e., 0.001 seconds).What is the total delay of the new packet in arriving at Router B, i.e., how long does it take the new packet to arrive at Router B from the time it arrived at Router A? In your solution, clearly identify all four delay components the new packet experiences.arrow_forward
- P4. Consider the switch shown below. Suppose that all datagrams have the same fixed length, that the switch operates in a slotted, synchronous manner, and that in one time slot a datagram can be transferred from an input port to an output port. The switch fabric is a crossbar so that at most one datagram can be transferred to a given output port in a time slot, but different output ports can receive datagrams from different input ports in a single time slot. What is the minimal number of time slots needed to transfer the packets shown from input ports to their output ports, assuming any input queue scheduling order you want (i.e., it need not have HOL blocking)? What is the largest number of slots needed, assuming the worst-case scheduling order you can devise, assuming that a non-empty input queue is never idle? Switch fabric Output port X Output port Y Output port Zarrow_forwardData Communication Suppose that Router A and Router B are connected via a 0.05 Mbps link (note, 1 Mbps = 106 bps) and that the link connecting the two routers has a length of 80 meters. Suppose that Router A is in the process oftransmitting a packet, and that there are 15 additional packets in the queue of the router, when a new packet arrives at Router A. Assume the followinga. Every packet consists of 15,000 bits.b. 5000 bits of the currently-being-transmitted packet has been transmitted by Router A when the new packet arrives at Router A. c. Propagation speed of a bit over the link connecting the two routersis 2 ? 103 meters/sec.d. Processing delay of a packet at a router takes 1 millisecond (i.e., 0.001 seconds).What is the total delay of the new packet in arriving at Router B, i.e., how long does it take the new packet to arrive at Router B from the time it arrived at Router A? In your solution, clearly identify all four delay components the new packet experiences.arrow_forwardGiven a M/M/1 queue, which has packets arriving at a rate 2 packets/sec, an output link rate R bps, and an average packet size of 1500 bytes, write down: the expression for T, the average delay for a packet (i.e., from arrival till completing transmission at the output). b. the expression for the output utilization c. the expression for average number of packets in the queue d. the expression for average number of packets in the output NICarrow_forward
- Suppose an extension of TCP allows window size much larger than 64 KB. Assume the extended TCP runs over a 100-Mbps link with RTT 100 ms, segment size is 1 KB, and receiving window size is 1 MB. How long does it take to send a 200 KB file?arrow_forwardComputer A uses the Go-back-N ARQ protocol to send a 110 Mbytes file to computer B with a window size of 15. Given each frame carries 100K bytes data. How long does it take to send the whole file (the total time taken from A sending the first bit of the file until A receiving the last acknowledgment)? Given that the transmission rate of the link is 500 Mbps and the propagation time between A and B is 15ms. Assume no data or control frame is lost or damaged and ignore the overhead due to header and trailer.arrow_forwardSuppose a computer sends a frame to another computer on a bus topology LAN. The physical destination address of the frame is corrupted during the transmission. What happens to the frame? How can the sender be informed about the situation? Suppose a computer sends a packet at the network layer to another computer somewhere in the Internet. The logical destination address of the packet is cor- rupted. What happens to the packet? How can the source computer be informed of the situation?arrow_forward
- Consider a computer 1 that communicates with a computer 2 via LAN1, router R1, and LAN2. The sending computer1 is running two processes at this time with port addresses k and l. The receiving computer 2 is running three processes at this time with port addresses f, g and h. Process k in the sending computer 1 needs to communicate with process g in the receiving computer 2. Draw the network and show the contents of segments, packets and frames at the network, data link, and transport layer for each hop. Note: Computer 1 has: Physical address=15, Logical address=A Router R1 has: Physical address in the side of LAN 1=20, Logical address in the side of LAN1=B Physical address in the side of LAN 2=50, Logical address in the side of LAN2=D. Computer 2 has: Physical address=77, Logical address=E.arrow_forwardConsider the Go-Back-N (GBN) and Selective Repeat (SR) protocols with a sender window size of 4 and a sequence number range of 1024. For each of these protocols, describe what happens for the following cases:a) The first packet in the sender window size is lost before reaching the destination.b) All transmitted packets reached the destination except the third one.c) Only the first and last packets in the sender window size reached the destination.d) Only the ACKs of the first and last packets, in the sender window size, reached the destination.arrow_forwardAssume that Computer A, which is connected through an Ethernet cable to the Switch S1, is just powered on. The user opens a browser and then types a website address to receive the website from the Server (as shown in Figure 1). Write down all the important protocols that come into play by the time the first frame containing http request reaches R1. (Note: Before http frame, other frames have already been sent by other protocol(s).) Write down all the protocols with reference to the TCP Model as follows. Application Layer: Transport Layer: Internet Layer: Link Layer: [Physical Layer (if needed)]: After writing down the protocols that come into play, briefly write the procedure as to what happensarrow_forward
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