Misc Topics in Computer Networks

Question 11

In a sliding window ARQ scheme, the transmitter\'s window size is N and the receiver\'s window size is M. The minimum number of distinct sequence numbers required to ensure correct operation of the ARQ scheme is  

• min (M, N)
• max (M, N)
• M + N
• MN

Question 12

Which one of the following protocols is NOT used to resolve one form of address to another one?

• DNS
• ARP
• DHCP
• RARP

Question 13

Identify the correct sequence in which the following packets are transmitted on the network by a host when a browser requests a webpage from a remote server, assuming that the host has just been restarted.

• HTTP GET request, DNS query, TCP SYN
• DNS query, HTTP GET request, TCP SYN
• DNS query, TCP SYN, HTTP GET request
• TCP SYN, DNS query, HTTP GET request

Question 14

Provide the best matching between the entries in the two columns given in the table below:

• I-a, II-d, III-c, IV-b
• I-b, II-d, III-c, IV-a
• I-a, II-c, III-d, IV-b
• I-b, II-c, III-d, IV-a

Question 15

Which protocol will be used to automate the IP configuration mechanism which includes IP address, subnet mask, default gateway, and DNS information?

• SMTP
• DHCP
• ARP
• TCP/IP

Question 16

In Go–back 3 flow control protocol every 6th packet is lost. If we have to send 11 packets. How many transmissions will be needed ?

• 10
• 17
• 12
• 9

Question 17

What will be the total minimum bandwidth of the channel required for 7 channels of 400 kHz bandwidth multiplexed together with each guard band of 20 kHz?

• 2800 khz
• 2600 khz
• 3600 khz
• 2920 khz

Question 18

In serial communications employing 8 data bits, a parity bit and 2 stop bits, the minimum band rate required to sustain a transfer rate of 300 characters per second is

• 2400 band
• 19200 band
• 4800 band
• 1200 band

Question 19

Purpose of a start bit in R8232 serial communication protocol is

• to synchronize receiver for receiving every byte
• to synchronize receiver for receiving a sequence of bytes
• a parity bit
• to synchronize receiver for receiving the last byte

Question 20

Physical topology of FDDI is?

• Bus
• Ring
• Star
• None of the above