Chose the appropriate terminology which expresses the following concepts: (Flow control, A token-ring Network, RTT, star topology, non-persistent HTTP, persistent HTTP, Network layer, Persistent, Interconnection, bus it, Interconnection, bus topology, Transport servi DNS). NO Terminology Description 1 Is a deterministic network, meaning each station connected to the network is assured access for transmission of its messages at regular or fixed time intervals. 2 Multiple objects can be sent over single TCP connection between client, server. 3 Allows users to exchange information (data) with other network members. 4 All LAN data traffic is carried over a common coaxial cable link. Value used for error checking. Response time=2RTT+ file transmission time. 10 5 6

Chose the appropriate terminology which expresses the following concepts: (Flow control, A token-ring Network, RTT, star topology, non-persistent HTTP, persistent HTTP, Network layer, Persistent, Interconnection, bus it, Interconnection, bus topology, Transport servi DNS). NO Terminology Description 1 Is a deterministic network, meaning each station connected to the network is assured access for transmission of its messages at regular or fixed time intervals. 2 Multiple objects can be sent over single TCP connection between client, server. 3 Allows users to exchange information (data) with other network members. 4 All LAN data traffic is carried over a common coaxial cable link. Value used for error checking. Response time=2RTT+ file transmission time. 10 5 6

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 two (2) communication services for use in asynchronous distributed systems.In service A, messages may be lost, duplicated or delayed and checksums apply only to headers. In service B, messages may be lost, delayed or delivered too fast for the recipient to handle them, but those that are delivered arrive in order and with the correct contents.i. Describe the classes of failure (arbitrary or omission errors) exhibited by each service.ii. Can service B be described as a reliable communication service?
Q9B- Context- Alice and Bob are members of the same Kerberos realm. They are both currently logged in with active session keys from the Kerberos KDC (key distribution centre). As per the Kerberos standard, the KDC has created unique session keys for both Alice and Bob, and then discarded them once received by the respective users. Alice wants to access a resource owned by Bob and contacts the KDC to request the necessary material. Answer the following questions about this scenario: Q- How can the KDC verify Alice’s identity after discarding her session key?
29. The level that treats different types of traffics in different ways, giving certain traffic streams higher priority than other streams and with best efforts, but no guarantees are made : a. Best effort service b. Soft QoS c. Worst effort service d. Hard QoS
Two processes CLT and SRV are involved in remote invocation with CLT acting as the client,while SRV acts as the server.(a) Highlight the underlying request-reply protocol using its primitives. (b) The request issued by C was not replied to on time. Explain the steps taken by bothprocessesusing the at-least-once semantics.(c) Explain the steps taken by both processes using the exactly-once semantics when CLT does not receive the response.
TELNET, for example, allows Computer A to interact with Computer C. At the same time, computer A and computer B interact using the File Transfer Protocol (FTP). We need a mechanism to designate the various processes so that they may get data at the same time. Could you describe how you came up with that method?
Alice (Sender): Sends an encrypted message along with the encrypted symmetric key. Bob (Receiver): Decrypts the symmetric key using his private key, then decrypts the message using the symmetric key. give me in graphical represenation or dgarm flows to easily understand
For example, Computer A can communicate with computer C by using TELNET. At the same time, computer A communicates with computer B by using the File Transfer Protocol (FTP). For these processes to receive data simultaneously, we need a method to label the different processes. Could you explain that method?
Please solve it correctly with a proper explanation of the calculation. Question: Given, you want to visit “welcomebacktophysicalexams.com”. Your network has alocal DNS server and is using a recursive lookup to fetch IP addresses and RTT of 29 ms.Others in your network have already visited the above website a few hours before yourvisit.After fetching the IP address, your PC sends a non-persistent HTTP request of size 109bytes to bring 13 objects of size 31 bytes each. In this particular connection, it requiresthe PC 67ms to send the TCP request to the server. I. What is the total RTT in ms in the DNS lookup?II. What is the total RTT in ms required (including DNS) to bring the full object toyour PC?III. What is the total file transmission time in ms after fetching the IP address?
q9c- Context- Alice and Bob are members of the same Kerberos realm. They are both currently logged in with active session keys from the Kerberos KDC (key distribution centre). As per the Kerberos standard, the KDC has created unique session keys for both Alice and Bob, and then discarded them once received by the respective users. Alice wants to access a resource owned by Bob and contacts the KDC to request the necessary material. Answer the following questions about this scenario: Q- When Bob receives the service ticket from Alice, why should he trust her and what guarantees the service ticket is genuine and wasn’t forged by Alice?
Consider a server that has 20 users, each of which has 50 files in their home directory. Each user should have read and write access to every file in their own home directory. a.If this policy were expressed as a DAC matrix, how many non-empty entries (cells) would the matrix need to have? b. Express this policy as a single if-then sentence, such as might be used in an Attribute-based Access Control (ABAC) system. The sentence should be English, but imagine that it could be translated into a logical constraint.
Consider the situation of an employee who is using their computer to send and receive email at their place of employment. However, the mail server is situated on a distinct network from the physical connectivity networks, which are all Ethernet networks. Each of the two networks—the employee's network and the mail server's network—is linked by a single router, which also has a connection to the Internet via the workplace's Internet service provider. Include any protocols that are used and any encapsulation/decapsulation that takes place when data moves between the employee's email client, local mail server, and distant mail servers in your explanation of how the email client communicates with the email server.
In this problem, we use the useful dig tool available on Unix and Linux hosts to explore the hierarchy of DNS servers. Recall that in Figure 2.19, a DNS server in the DNS hierarchy delegates a DNS query to a DNS server lower in the hierarchy, by sending back to the DNS client the name of that lower-level DNS server. First read the man page for dig, and then answer the following questions. Starting with a root DNS server (from one of the root servers [a-m].root-servers.net), initiate a sequence of queries for the IP address for your department’s Web server by using dig. Show the list of the names of DNS servers in the delegation chain in answering your query. Please tell me how I should use dig and which part of output I should write for answer this question, best with picture example, thank you!