Network-assisted or end-end congestion control? Which of the following actions are used in network-assisted congestion control (say versus end-end congestion control) to signal congestion. Check all that apply. A sender decreases its sending rate in response to packet loss detected via its transport- layer ACKing. The transport-layer receiver informs sender of the size of its (transport-payer receiver) receive window. A router drops a packet at a congested router. The sender decreases its sending rate in response to a measured increase in the RTT. A datagram experiences delay at a congested network router, which is then measured by the sender and used to decrease the sending rate. A router sends an ICMP message to a host telling it to slow down its sending rate. A router marks a field in the datagram header at a congested router.

Network-assisted or end-end congestion control? Which of the following actions are used in network-assisted congestion control (say versus end-end congestion control) to signal congestion. Check all that apply. A sender decreases its sending rate in response to packet loss detected via its transport- layer ACKing. The transport-layer receiver informs sender of the size of its (transport-payer receiver) receive window. A router drops a packet at a congested router. The sender decreases its sending rate in response to a measured increase in the RTT. A datagram experiences delay at a congested network router, which is then measured by the sender and used to decrease the sending rate. A router sends an ICMP message to a host telling it to slow down its sending rate. A router marks a field in the datagram header at a congested router.

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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Consider the following situation: Source node has packets number 1, 2, 3, 4, 5, 6, 7, and 8 to send to the destination Source starts transmitting and packet 3 is lost on its way to its destination. The rest of ACK and data packets arrive successfully Window size is 5 packets ACKs are packet number-based. Draw a diagram that illustrates what happens in the network during sender’s transmission of packets 1 – 8 when Go-Back-N protocol is used and a diagram that illustrates what happens when Selective Repeat is used. Initial diagrams have been already drawn for you. You need to complete the drawing.
Between two hosts, a single connection may deliver several packets if necessary. Please provide a breakdown of the timeframes required for processing freight. Is it to be anticipated that one delay will continue for a certain length of time while the other delay may be modified?
Suppose a TCP Vegas connection measures the RTT of its first packet and sets BaseRTT to that, but then a network link failure occurs and all subsequent traffic is routed via an alternative path with twice the RTT. How will TCP Vegas respond? What will happen to the value of Congestion Window? Assume no actual timeouts occur, and that 3 is much smaller than the initial Expected Rate.
Suppose a TCP Vegas connection measures the RTT of its first packet and sets BaseRTT to that, but then a network link failure occurs and all subsequent traffic is routed via an alternative path with twice the RTT. How will TCP Vegas respond? What will happen to the value of Congestion Window? Assume no actual timeouts occur, and that 3 is much smaller than the initial Expected Rate.
. Consider a packet of length L that begins at end system A and travels over three links to a destination end system. These three links are connected by two packet switches. Let di, si, and Ridenote the length, propagation speed, and the transmission rate of link i, for i=1,2,3. The packet switch delays each packet by dproc. Assuming no queuing delays, in terms of di, si, Ri, (i=1,2,3), and L, what is the total end-to-end delay for the packet? Suppose now the packet is 1,500 bytes, the propagation speed on all three links is 2.5-108m/s, the transmission rates of all three links are 2 Mbps, the packet switch processing delay is 3 msec, the length of the first link is 5,000 km, the length of the second link is 4,000 km, and the length of the last link is 1,000 km. For these values, what is the end-to-end delay?
Assuming that all routers and hosts are working properly and that all software in both is free of all errors, is there any chance, however small, that a packet will be delivered to the wrong destination?
Suppose there is exactly one packet switch between a sanding host and a receiving host The transmission rates between the sending host and the switch and between the switch and the receiving host are R and Rz, respectively. Assuming that the switch uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L? (Ignore queuing, propagation delay, and processing delay.)
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Please solve the following. Thank you.
Consider a router with a full finite buffer and a packet arrival rate that exceeds the output link capacity of the router. When a new packet arrives, what will the router do? .
Suppose a TCP Vegas connection measures the RTT of its first packet and sets BaseRTT to that, but then a network link failure occurs and all subsequent traffic is routed via an alternative path with twice the RTT. How will TCP Vegas respond? What will happen to the value of Congestion Window? Assume no actual timeouts occur, and that 3 is much smaller than the initial Expected Rate.
Suppose that an arriving packet matches two or more entries in a router's forwarding table. With traditional destination-based forwarding, what rule does a router apply to determine which of these rules should be applied to determine the output port to which the arriving packet should be switched?