21. Consider the network below. a. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? H1 H2 2 3 4 1 B 2 2. 2 3 H3

21. Consider the network below. a. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? H1 H2 2 3 4 1 B 2 2. 2 3 H3

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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22. A datagram subnet allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination host. If either of the routers discards a packet, the source host eventually times out and tries again. If both host-router and router-router lines are counted as hops, what is the mean number of a. (a) hops a packet makes per transmission? b. (b) transmissions a packet makes? (c) hops required per received packet?
Each active interface of Distance vector gets frequent transmissions of the whole routing table that Distance vector maintains. The link status protocol broadcasts information about the state of a router's own connections to all other routers in the network. Each statement has two ideal examples that show how the Link state and the Distance vector may be utilized in a number of circumstances.
22. A datagram subnet allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination host. If either of the routers discards a packet, the source host eventually times out and tries again. If both host-router and router-router lines are counted as hops, what is the mean number of a. (a) hops a packet makes per transmission? b. (b) transmissions a packet makes? c. (c) hops required per received packet?
A router has the following four active flows, and each flow has packets to transmit. Given FQ is being used on the router, what is the order that the packets will be transmitted?
P1. Consider the network below. a. Show the forwarding table in router A, such that all traffic destined to host H3 is forwarded through interface 3. b. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? (Hint: This is a trick question.)
55. The problem with unicast delivery is that the : a. memory allocation is difficult b. server must establish a seperate unicast session for each client c. the routers must support unicasting d. the clients must be close to the server
1. Consider a path from host A to host B through a router X as follows: A- -X-B The capacity of the link AX is denoted Ra, while the capacity of the link XB is denoted Rb in units of [bits/s]. Assume that Ra Ri. Is it possible that the second packet queues at input queue of the second link? Explain. Now suppose that host A sends the second packet T seconds after sending the first packet. How large must T be to ensure no queueing before the second link? Explain.
Each of Distance vector's active interfaces receives regular transmissions of the whole routing table that Distance vector maintains. The information about the condition of a router's own connections is broadcast to all other routers in the network through the link status protocol. There are two perfect examples that can be used for each assertion to demonstrate how the Link state and the Distance vector may be used in a variety of contexts.
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.
Question 5: Suppose you attach a network monitor to observe the sequence of frames that travel over a link from sender A to receiver B. The problem is to deduce what protocols, if any, could have generated the observed sequence. The following diagrams depict a flow of frames, with their corresponding sequence numbers, from the sender (A). There may be traffic from B to A, which is not depicted in the diagram. A gap between adjacent frames implies passage of time with no transmission from the sender. Note that the x-axis is time, and not space. Justify your answer. A A A ● ● ● ● 1 5 ● 3 5 0 ● 0 0 1 1 1 ● Go-Back-N ● Selective Repeat 1 0 5 0 c) For Diagram 3, the protocol is not: Stop-and-Wait Time Diagram 1 2 Time a) For Diagram 1, the most likely protocol being used is: Stop-and-Wait ● Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat, give the window size) Diagram 2 Time 3 Diagram 3 1 Time b) For Diagram 2, the most likely protocol being used is:…
5. Consider the network below. Suppose that this network is a datagram network. Show the forwarding table in router D, such that all traffic destined to host H1 is forwarded through interface 1. а. Suppose that this network is a datagram network. Can you write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 3, while all traffic from H2 destined to host H3 is forwarded through interface 4? (Hint: this is a trick question.) Now suppose that this network is a virtual circuit network and that there is one ongoing call between H1 and H3, and another ongoing call between H2 and H3. Write down a forwarding table in router A, such that all traffic from H1 destined to host H3 is forwarded through interface 4, while all traffic from H2 destined to host H3 is forwarded through interface 3. с. Assuming the same scenario as (c), write down the forwarding tables in nodes B, C, and D. d. Assuming the same scenario as (c) and if the…
There are four routers in all. Each of the four distinct router types Is it necessary for router A to recompute its distance vector in response to the addition of routers B and D to the network with the construction of a new connection between routers A and C? RIP works on routers and use the DV (distance vector) algorithm as its routing mechanism.