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- If a two port bridge was used in a heavy load standard Ethernet network such that the traffic is going through it. If each station is theoretically given a capacity of5Mbpsand the number of stations in each LAN segment is equal, then the number of stations in each LAN is: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 two systems are connected with LAN cable. The length of the cable is 3 kilometers and the data transmitted at a rate of 30 MB/s. The signal speed in the cable is 2.5 x 108 m/s. What is the minimum frame size in bits in the CSMA/CD network?
- 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?CAT-6 twisted pair cable is a commonly used computer networks cable that provides afrequency bandwidth of up to 250 MHz. It is suitable for most varieties of Ethernet overtwisted pair up to 1000 BASE-T (Gigabit Ethernet). Determine whether a signal-to-noise ratio(SNR) of 20 dB is adequate to transmit 0.9 Gbps on this cable?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
- We have a 1000 m long 10 Mbps communication channel with ARQ protocol. The signal travels at a speed of 2 ∗ 10 ^ 8 ? / ?Assume that no frame is lost or damaged. Confirmation frames, control information are negligible in size.For what range of frame sizes do we get an efficiency of at least 70%?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?An IEEE802.11g with 54 Mbps has 58 byte MAC header and 50 byte IP header, the antenna has RXTXTurnaroundTime of 4.3 ms, - What is the time to start sending the frame payload? seconds - If 44 micro seconds is needed to send the ACK(SIFS+ACK) and the payload size is 1080 byte, what is the advertised duration field in the frame header in binary (no RTS/CTS)? - Can the attacker perform scrambling attack on time? OYes ONO
- "An application message is segmented into 20 packets, each of which is 2500-byte in size. Calculate the end-to-end delay in milliseconds (ms) for the message when the bit rate for any node is 10 Mbps, the optical path total distance is 1200-km, and the queuing and processing delays are 1-ms and 3-ms, respectively. There are 2 intermediate routers in the path, each of which uses the store and-forward approach. Round your answer to the nearest integer. Question 16 of 37N users share a 1 Mbps link. Each user alternates between periods of activity, when a user generates data at a constant rate of 100 kbps, and periods of inactivity, when a user generates no data. Suppose that a user is active only 50 percent of the time and is idle during the remaining 50 percent of the time. How many simultaneous users can be supported through circuit-switching? If the maximum number of simultaneous users that circuit-switching can support is k, then determine the probability that at most k users will be active when we use packet switching to support 20 users. What happens when the number of users increases beyond 20 in packet switching?Let the two host X and Y connected via a packet switch with 107 bits per second links. Switch is placed at 50 km from X. X and Y are located at 100 Kilometer apart also the propagation speed along the link is 2 × 108 m/s. The switch begins forwarding a packet after 0.1 milliseconds it receives the packet. If 1000 bytes of File are needed to be transmitted and each packet size is 500 bytes, the time elapsed between the transmission of the first bit of data and the reception of the last bit of the data in millisecond is