ISRO CS 2016

Question 61

In the Spiral model of software development, the primary determinant in selecting activities in each iteration is

• Iteration size
• Cost
• Adopted process such as Rational Unified Process or Extreme Programming
• Risk

Question 62

Bit stuffing refers to

• inserting a \'0\' in user stream to differentiate it with a flag
• inserting a \'0\' in flag stream to avoid ambiguity
• appending a nibble to the flag sequence
• appending a nibble to the use data stream

Question 63

Dynamic routing protocol enable routers to

• Dynamically discover and maintain routes
• Distribute routing updates to other routers
• Reach agreement with other routers about the network topology
• All of the above

Question 64

In Ethernet CSMA/CD, the special bit sequence transmitted by media access management to handle collision is called

• Preamble

• Postamble

• Jam

• None of the above

Question 65

Which network protocol allows hosts to dynamically get a unique IP number on each bootup

• DHCP
• BOOTP
• RARP
• ARP

Question 66

In a token ring network the transmission speed is 10⁷ bps and the propagation speed is 200 meters/ μs. The 1-bit delay in this network is equivalent to:

• 500 meters of cable.
• 200 meters of cable.
• 20 meters of cable.
• 50 meters of cable.

Question 67

The address of a class B host is to be split into subnets with a 6-bit subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet?

• 62 subnets and 262142 hosts.
• 64 subnets and 262142 hosts.
• 62 subnets and 1022 hosts.
• 64 subnets and 1024 hosts.

Question 68

The message 11001001 is to be transmitted using the CRC polynomial x³ + 1 to protect it from errors. The message that should be transmitted is:

• 11001001000
• 11001001011
• 11001010
• 110010010011

Question 69

What is the maximum size of data that the application layer can pass on to the TCP layer below?

• Any size
• 2¹⁶ bytes - size of TCP header
• 2¹⁶ bytes
• 1500

Question 70

Frames of 1000 bits are sent over a 10 ^ 6 bps duplex link between two hosts. The propagation time is 25ms. Frames are to be transmitted into this link to maximally pack them in transit (within the link). What is the minimum number of bits (I) that will be required to represent the sequence numbers distinctly? Assume that no time gap needs to be given between transmission of two frames.

• l = 2
• l = 3
• l = 4
• l = 5