Determine if the following schedule is allowed to finish when the timestamp based protocol is used. Assume each transaction’s timestamp is its starting time, and the entire schedule started at time point 2. T2:R(X) ; T2:R(Y) ; T3:R(Y) ; T3:R(X) ; T3:W(X) ; T3:W(Y)

Sketch a solution to automatically determine the best trace length for predicting replication policies in Globule.

Network & Data Communications

A protocol for interleaved deliveries from two senders. Consider the figure below, which shows three nodes, A, B, and C. A and C are connected by a bi-directional channel; B and C are connected by a separate independent bi-directional channel. A and B can not communicate with each other. The goal of the protocol you will design is to transfer data from A and from B in a coordinated manner to C. The protocol between sender A and receiver C (and sender B and C) operates as follows. Senders A and B each receive data from their upper layer, via a call to rdt_send(data), which returns the data to be sent, exactly the same as the rdt protocols we studied in class and in the text. Senders A and B are to reliably send their sequence of data obtained via subsequent calls from rdt_send(data) to C. Node C should deliver to its application layer (via a call to deliver_data())a data item from A (as soon as it has correctly received that data item), followed by a data item from B (as soon as it has…

3. Write the commands to configure the OSPFV3 in the following topology diagram. Area 1 Area 0 Fa0/0 2001:DB8:1:12::/64 A 2001:DB8:1:1::/64 Fa0/0 So/O :1 ::2 So/0 R2 ::2 ::1 R1 so/0 ::1 SO/1 ::3 ::1 Area 14 Fa0/0 Fa0/1 ::3 ::4 2001:DB8:1:14:/64 2001:DB8:1:13::/64 R3 Fa0/0 R4 ::4 Fa0/1 2001:DB8:1:4::/64 4. a) Router R1 b) Router R2 c) Router R3 d) Router R4 4. Answer the following questions based on Layer 3 VLAN Configuration. Routero Fa0/0 10.10. 10.1/24 no switchportFa0/3 10. 10.10.2/24 trunk Fa0/1 trunk Multilayer trunk Fa0/1 Fa0/2 trunk access vlan 2 Fa0/1 Fa0/2 Switcho Switc access vlan 3 Fa0 Fa0/2 192. 168.3.0/24 (VLAN 3) 192. 168.2.0/24 (VLAN 2) Fa0 PCO PC1 a) Write the steps to configure VLAN in Layer 3 Switches. b) How many VLANS are there in the above topology diagram c) Identify the trunk link in the above topology diagram d) How many sub-interfaces to be created in Router 0 e) Do we need any Routing Protocol or Static Route to be configured to communicate from PC0 to PC1?…

Describe the working of recursive and iterative queries in DNS. Use figures for the description.  A file of F = 3 x 105 bits is distributed to N peers. The server has an upload rate of us = 1 x 105 bps. Each peer has a download rate of di = 1 x 105 bps and an upload rate of u = 30,000 bps. For N = 1 to 10, and for both client-server and P2P architectures, plot a single graph with minimum distribution time on the y-axis and N on the x-axis. Use a table to show all the values for N = 1 to 10 and use the values to plot the graph. Clearly show the calculation only for N = 1, 2, and 3.  Explain at least one P2P application (BitTorrent or DHT) in detail.

Complete the following table using the token bucket algorithm. Only the 4th column (transmitted packet) and the last row will be graded as highlighted. Bucket size = 1200 bytes. Token size = 850 bytes. Time 1 2 3 4 5 RX pkt 253 1104 1000 0 122 Bucket occupancy before packet transmission Transmitted packet Bucket occupancy after packet transmission

Check whether the given schedule S is conflict serializable or not- S : R1(A) , R2(A) , R1(B) , R2(B) , R3(B) , W1(A) , W2(B), W3(B),W3(A). S: R2(X) , W3(X) commit, W1(X) Commit, W2(Y), R2(Z) Commit, R4(X), R4(Y), R5(Z), W1(Z). S: R4(A), R2(A), R3(A), W1(B), W2(A), R3(B), W2(B), W3(A), W4(B)

Consider, for instance, a database that is used by a large airline and that makes use of snapshot isolation. In what kind of circumstances can an airline agree to a non-serializable execution in the hope of improving its overall performance?