an Internet connection from a LAN through a proxy server if: Internet Delay 76 sec, Access Delay 3 sec, and LAN delay = 0.6 sec. %3D If no caching is used. If caching is used with a hit rate of а. b. 60%.
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- A network with Ethernet LAN protocol in MAC layer having minimum frame length is 1000 bits. If the speed of signal is 2x10³ m/s and length of cable is 1 km. Then what is the expected data rate in Mbps_ ?An application message is segmented into 10 packets, each of which is 1500-byte in size. Caculate the end- to end delay for the message when the bit rate for any node is 1.5 Mbps, the optical path total distance is 200-km, and the queuing and processing delays are 2-ms and 1-ms, respectively. There are 3 intermediate routers in the path, each of which uses the store-and-forward approach.A TCP connection is established through 10 wireless hops in an acoustic underwater ad hoc network. Assume that each hop is 100 meter in the average, acoustic signals travel 1500 meter per second, 10 kilobit data can be sent per second over a link, the source node has one megabyte of data to send, the receiver window size is 64 kilobytes, the maximum segment size is 1 kilobyte and the average processing delay for routing at each node is one millisecond. Assume also that the following segments do not reach the destination: 67, 112, 137. What would be the average utilization of the links for this connection if there is not another communications through them? Explain an alternative approach to increase the bandwidth utilization?
- A- Two computers connected via a green optical link of 10 km length with frames of 500 bytes, transmitting 100 Mbps. Deployment velocity 200,000 km / sec. Calculate the total delay and ignore any processing and queuing delays. b- Consider shown in the figure, 3 hosts and a local server are connected to a router each other by a 100Mbps link, with no propagation delay. This router is a device connected to another device, and a defense router 50, this is a second part. Suppose a host is sending a message directly to one of the remote servers. The message is 10 kilobits long. What is end-to-end delay? Queue number or delays in the central? over there 11:34 PM VSuppose users in a network share a 4 Mbps communication link and each user requires 125 kbps when transmitting. However, each user transmits only 20 percent of the time. Suppose there are 30 users and packet switching is employed. Find the probability that at any given, there are 17 or more users transmitting simultaneously.If a multi port bridge was used in a heavy load standard Ethernet network such that the traffic is not going through it. If the total number of stations in the LAN is 40 and the number of collision domains is 4 with equal number of stations in each domain, then each station will theoretically be given a capacity in Mbps :equals to
- In a network, two systems are connected and the distance between the system is 5000 km. The propagation speed of the medium is 2 x 107 m/s. The bandwidth of the network is 500 MBps. If the average packet size is 108 bits and the network is used to its full capacity. The minimum size of the sequence number field is n bits. The processing delay at nodes is 0 ms. What is the value of n in case of Go-Back-N sliding window protocol?32222 data bytes are transferred from client to server over a TCP connection over a point-to- point line using Ethernet frames (total overhead = 26 bytes, assume no interframe gap.). The connection parameters are the following: MSS=1280 for both ends, initial sequence number for client is 543 and for server is 99992. The client initiates the disconnection right after finishing data transmission by sending the FIN flag and server replies by sending the FIN flag. Assume the window size is 20000 bytes on both sides and no options in IP and TCP headers. Also assume one ACK segment is sent for each data segment. (a) Show a diagram of a data frame and a control frame (ACK, SYN, etc). Show how many bytes in each field: Eth header, payload, trailer. Assume padding is used for Ethernet frames with a data length less than 46 bytes. the answers are data: 1306 bytes, control: 72 bytes. Explain the answers32222 data bytes are transferred from client to server over a TCP connection over a point-to- point line using Ethernet frames (total overhead = 26 bytes, assume no interframe gap.). The connection parameters are the following: MSS=1280 for both ends, initial sequence number for client is 543 and for server is 99992. The client initiates the disconnection right after finishing data transmission by sending the FIN flag and server replies by sending the FIN flag. Assume the window size is 20000 bytes on both sides and no options in IP and TCP headers. Also assume one ACK segment is sent for each data segment. (a) Show a diagram of a data frame and a control frame (ACK, SYN, etc). Show how many bytes in each field: Eth header, payload, trailer. Assume padding is used for Ethernet frames with a data length less than 46 bytes. the answers are data: 1306 bytes, control: 72 bytes. I need clear explanation of every field in ethernet frames and how did you know the size of each field?
- Router R1 is connected to another router R2 with link of L1 with a transmission rate of 67 packets/second. The link buffer at router R1 contains on an average 15 packets. There is one packet being currently transmitted. Average packet queuing delay is 15 milliseconds. Assuming no packet loss, what is the average packet arrival rate at R1?Computer Networks Problem In the CSMA/CD protocol, the network adapter waits K-512 bit times after a collision, where K is drawn randomly. For K=20, how long does the adapter wait until returning to Step 2 for a 10 Mbps broadcast channel?Consider the network with adjacency matrix A given by 1 1 1 0 0 0 А — 1 1 1 0 1 How many strongly connected components does the network contain? Select one: о а. O b. 1 Ос. O d. None of the above