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
A packet showing the ACK flag turned on indicates ____.
A. |
data should be sent without additional buffering
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B |
the sender is requesting the connection to be reset
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C. |
the last packet in a sequence
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D, |
a response to a SYN packet
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- Q: when a file is transferred between two computers two acknowledgments strategies are possible. In first one the file is chopped up like packets which are individually acknowledged by receiver but file transfer is whole acknowledged. In the second the packets are not acknowledged individually but entire file is acknowledged.Discuss the two approaches.arrow_forwardObtain the HTTP/1.1 specification (RFC 2616). Answer the following questions: a. Explain the mechanism used for signaling between the client and server to indicate that a persistent connection is being closed. Can the client, the server, or both signal the close of a connection? b. What encryption services are provided by HTTP? c. Can a client open three or more simultaneous connections with a given server? d. Either a server or a client may close a transport connection between them if either one detects the connection has been idle for some time. Is it pos- sible that one side starts closing a connection while the other side is transmitting data via this connection? Explain.arrow_forwardObtain the HTTP/1.1 specification (RFC 2616). Answer the following questions: a. Explain the mechanism used for signaling between the client and server to indicate that a persistent connection is being closed. Can the client, the server, or both signal the close of a connection? b. What encryption services are provided by HTTP? c. Can a client open three or more simultaneous connections with a given server? d. Either a server or a client may close a transport connection between them if either one detects the connection has been idle for some time. Is it possible that one side starts closing a connection while the other side is transmitting data via this connection? Explain.arrow_forward
- When HTTP streaming is being used, are the TCP receive buffer and the application buffer on the client both the same thing? If they are unable to speak with one another, it is unclear how they will behave toward one another.arrow_forwardIdentify the incorrect statement: A. FTP stands for File Transfer ProtocolB. FTP uses two parallel TCP connectionsC. FTP sends its control information in-bandD. FTP sends exactly one file over the data connectionarrow_forwardHow much time does Non-persistent HTTP and no concurrent TCP connections expire if DNS searching up occurs once per 10 minutes, and each time the HTTP file mentions 8 objects?arrow_forward
- 1. When DC1, acting as a DNS client, performs a DNS lookup, which DNS server is it using?arrow_forwardIs the client's application buffer and the TCP receive buffer the same thing when utilizing HTTP streaming? How are they supposed to engage with one another if they are unable to speak with one another?arrow_forwardThis Chain applies for all packets that are addressed to the firewall INPUT OUTPUT FORWARD This chain applies for all packets originating from firewall and going out of the server O INPUT ⒸOUTPUT FORWARD This chain applies for all packets passing through the firewall from other hosts on the network. The host with iptables is neither the source nor destination of the packet: mainly used to route packets through the machines on the network. INPUT OUTPUT Ⓒ FORWARD This jump target does not respond to a packet at all and does nothing with the packet. It an attack sends a packet. they would not get any response. ODROP ⒸREJECT This jump target responds with an ICMP Destination Unreachable back to the source. This indicates that a server exists, which is beneficial for troubleshooting and for attackers. DROP O REJECTarrow_forward
- Server reply (UDP). How does the networked application running on a server know the client IP address and the port number to reply to in response to a received datagram? As the result of performing the accept () statement, the server has created a new socket that is bound to that specific client, and so sending into this new socket (without explicitly specifying the client IP address and port number) is sufficient to ensure that the sent data will be addressed to the correct client. The server will know the port number being used by the client since all services have a well-known port number. The application code at the server determines client IP address and port # from the initial segment sent by client, and must explicitly specify these values when sending into a socket back to that client. The server will query the DNS to learn the IP address of the client. Not quite. Your answer isn't correct.arrow_forwardSuppose a DNS resource record has the type of MX. Then the value of the record is . A. the IP address of the mail server that has the alias hostname in the name of the record B. the hostname of the mail server that has the alias hostname in the name of the record C. the hostname of the DNS server that is authoritative for the host specified in the name of the record D. none of the abovearrow_forwardQuestion 2 . The non-persistent HTTP protocol executes six main steps in order to establish a connection between a server and a client and transfer data between the client of the server. Pleaseenumerate these steps by clearly identifying the steps/actions of the sender and those of the Pleaseindicate the steps which are affected in case of persistent HTTP and how they are Aclient wants to download 45 documents of size 500 bits each from a server that has a transmission rate of 40bps. If the RTT between the client and server is 1 ms, please indicate the time needed to download the 45 movies if PersistentHTTP is used Non-persistentHTTP is usedarrow_forward
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