Transport Layer

Question 41

Consider a subnet with 720 routers. If a three-level hierarchy is chosen with eight clusters, each containing 9 regions of 10 routers, then total number of entries in the routing table is __________.

• 25
• 27
• 53
• 72

Question 42

A device is sending out data at the rate of 2000 bps. How long does it take to send a file of 1,00,000 characters ?

• 50
• 200
• 400
• 800

Question 43

The TCP sliding window

• can be used to control the flow of information
• always occurs when the field value is 0
• always occurs when the field value is 1
• occurs horizontally

Question 44

The maximum payload of a TCP segment is:

• 65,535
• 65,515
• 65,495
• 65,475

Question 45

Which of the following is not a field in TCP header?

• Sequence number

• Fragment offset

• Checksum

• Window size

Question 46

Assuming that for a given network layer implementation, connection establishment overhead is 100 bytes and disconnection overhead is 28 bytes. What would be the minimum size of the packet the transport layer needs to keep up, if it wishes to implement a datagram service above the network needs to keep its overhead to a minimum of 12.5%. (Ignore transport layer overhead)

• 512 bytes

• 768 bytes

• 1152 bytes

• 1024 bytes

Question 47

Which of the following statements are true ? 

(a) Three broad categories of Networks are  

• Circuit Switched Networks 
•  Packet Switched Networks 
• Message Switched Networks 

(b) Circuit Switched Network resources need not be reserved during the set up phase. 

(c) In packet switching there is no resource allocation for packets. Code :

• (a) and (b) only

• (b) and (c) only

• (a) and (c) only

• (a), (b) and (c)

Question 48

To guarantee correction of upto t errors, the minimum Hamming distance d _min in a block code must be ________.

• t+1
• t−2
• 2t−1
• 2t+1

Question 49

Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page contains text and five very small images. The minimum number of TCP connections required to display the web page completely in your browser is ________ . Note - This question was Numerical Type.

• 6
• 7
• 8
• 9

Question 50

Consider a TCP connection between a client and a server with the following specifications; the round trip time is 6 ms, the size of the receiver advertised window is 50 KB, slow-start threshold at the client is 32 KB, and the maximum segment size is 2 KB. The connection is established at time t=0. Assume that there are no timeouts and errors during transmission. Then the size of the congestion window (in KB) at time t+60 ms after all acknowledgements are processed is _________ . 

• 33

• 44

• 55

• 50