Basic CS [TCS Placement]: Sample Questions 88 - 90 of 196
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Question 88
Explanation
- Round-trip delay time (RTD) or round-trip time (RTT) is the time taken for signal to be sent plus the time taken for corresponding acknowledgment to be received.
- This time delay consists of the propagation times between the two points of a signal.
- It depends on message size, length of link, direction of propagation, propagation velocity, node processing delay, network traffic load etc.
Question 89
Explanation
- Mail gateway handles connections between networks running different communications protocols or communications between different networks that use the same protocol.
- A mail gateway might connect a TCP/IP network to network running the Systems Network Architecture (SNA) protocol suite.
- If a mail gateway exists, send mail uses it for sending and receiving mail outside domain.
Question 90
Explanation
- Redirector intercepts file or prints I/O requests and translates them into network requests. under presentation layer.
- Redirector acts like:
- A client in a network, which does I/O operation by sending I/O requests to servers and processing the responses from the servers.
- A server in a network by receiving I/O requests from servers and processing the requests
- Performs all of the low-level interaction with the server in resolving the file name enabling application to access and manipulate resources on remote servers as on the local machine.
- Redirectors operate entirely within kernel mode. This provides the following performance advantages over user-mode alternatives