Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
The reason that Step-function method can estimate the number of hosts used as stepping-stones is _____.
Question options:
step-function has multiple steps.
RTTs of TCP packets follow Poisson Distribution approximately
Intruders connect to multiple hosts
All the packets are collected.
To get the maximum similarity between two sequences with the same size N, for the worst case, the time complexity of SES is ____.
Question options:
O(N)
O(NP)
O(N2)
O(2N)
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- Given the following distances between destination nodes, what is the minimum distance that connects all the nodes?FromToDistance12120231001320024150359045170 290310620460None of the abovearrow_forwardThree-way handshake is used by a TCP client and a TCP server to establish a connection, as illustrated below: 1st: client:port1 -> server:port2, SYN 2nd: server:port2 -> client:port1, SYNACK 3rd: client:port1 -> server:port2, ACK When this client is performing scanning attacks, it will generated a large number of failed connections. In each failed connection, the three-way handshake fails to complete. People commonly use SYN together with the absence of its corresponding SYNACK in this same TCP session to identify whether this connection is failed. By investigating the failed connections, an engineer finds that in legitimate/benign cases, if the server does not return SYNACK to the client, the client will not send the ACK packet after SYNACK (e.g., the 3rd packet above). Therefore, this engineer suggests that we can count the failed connections based on the following rules without considering SYNACK:arrow_forwardSMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts. A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. You have defined the packet filter rule set shown in the table below. These rules permit and/or deny inbound and outbound traffic between the user agent and the mail server. Describe the purpose of each packet filter rule in the table. Rule Direction Source Address Destination Address Protocol Destination Port Action A2 In External Internal TCP 25 Permit B2 Out Internal External TCP > 1023 Permit C2 Out Internal External TCP 25 Permit D2 In External Internal TCP > 1023 Permit E2 Either Any Any Any Any Denyarrow_forward
- Make a map → from source to destination there are many routes that can be taken within the map. Connect the 5 routers → name it A (has 3 connections), B (has 2 connections), C (has 2 connections), D (has 2 connections), and E (has 1 connection). IP addressing: LAN A1 A2 A3 B1 B2 C1 C2 D1 D2 E1 Network Address 192.168.1.0 192.168.2.0 192.168.3.0 192.168.10.0 192.168.11.0 192.168.20.0 192.168.21.0 192.168.32.0 192.168.33.0 192.168.40.0 Subnet Mask /24arrow_forwardAll packets are treated equally in Priority Queuing. Select one: O True O Falsearrow_forwardThree-way handshake is used by a TCP client and a TCP server to establish a connection, as illustrated below: 1st: client:port1 -> server:port2, SYN 2nd: server:port2 -> client:port1, SYNACK 3rd: client:port1 -> server:port2, ACK When this client is performing scanning attacks, it will generated a large number of failed connections. In each failed connection, the three-way handshake fails to complete. People commonly use SYN together with the absence of its corresponding SYNACK in this same TCP session to identify whether this connection is failed. By investigating the failed connections, an engineer finds that in legitimate/benign cases, if the server does not return SYNACK to the client, the client will not send the ACK packet after SYNACK (e.g., the 3rd packet above). Therefore, this engineer suggests that we can count the failed connections based on the following rules without considering SYNACK: If a client:port1 sends…arrow_forward
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