Question

21. App (application software) requires a member of transport services to function. Which choice best describes the transport service required by an app? a. Reliable data transfer and long delay in transmission b. Good throughput and data integrity c. Data secunty and long delay in transmission d. long delay in transmission and poor timing 22. This transport protocol does not provide flow control reliability, congestion control, time or security. Which transport protocol is it? a. File transfer protocol b. Transmission control protocol c. User datagram protocol d. HTTP 23. The OSI/OSI model consist of 7 layers unlike the network layer with only five layers. Which choices correctly identify the missing layers in the network layer? a. Application and network link b. Transport and application c. Physical and network d. Presentation and session 24. What is the purpose of the UDP checksum? a. To keep track of email messages sent over the intemet b. Add the high bits before sending the message segments c. Detects errors in transmutted bits d. Count the bit segments to ensure that the correct number of segments were sent 25. What are the consequences of congestion on the network a. Loss of packets and long delays b. Good throughput and high bandaridth c. Drop of queuing data and fast transmission d. Delay is not a problem

Answer 1

21) When we need several transport services to function for our application, we need Good throughput and good data integrity. (OPTION B)

Our App will have several services that are functioning so that we will have a fast transfer of data and data should reach and arrive correctly. This is called data integrity.

22)UDP ( User Datagram Protocol ) have features like:

• UDP will not provide any flow control. Since it's a connectionless protocol, it won't provide any flow control.
• UDP is the Unreliable protocol because we can't be sure if the data packets will reach the destination or not.
• We can't interpret the time and can't guarantee security for the data we transferred.
• OPTION C

23) OPTION -D

Layers in the ISO/OSI model are:

1. Application Layer
2. Presentation Layer
3. Session Layer
4. Transport Layer
5. Network Layer
6. Data Link layer
7. Physical Layer

Layers in the TCP/IP model are:

1. Application Layer
2. Transport Layer
3. Network / Internet Layer
4. Data Link layer
5. Physical Layer

Hence, we see that the presentation and session layers are the missing layers.

24)OPTION C

UDP has a checksum of 16 bits. This checksum will be used to detect the errors in the data we transmitted.

It Contains the total length of the user datagram, header, and data.

25)OPTION A

Congestion results in the reduced quality of the services provided by the application.

This can be due to too many hosts in the domain, low bandwidth, multicasting etc.,

It will result in the consequences like

• LOSS OF PACKETS DATA
• DELAY IN THE TRANSMISSION TIME

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