NPTEL-CLOUD COMPUTING-PRACTICE TEST-4 2025

Consider a system with 2 level caches. Access times of Level 1 cache, Level 2 cache, and main memory are 2 ns, 10 ns, and 200 ns, respectively. The hit rates of Level 1 and Level 2 caches are 0.8  and 0.9, respectively. What is the average access time of the system ignoring the search time within the cache?

• 8.6 ns

• 6.2 ns

• 7.4 ns

• 6.4 ns

A computer’s processor sends 32 bit addresses to the cache controller. It has a 512 KB, 8-way set associative, write back data cache with block size of 32 Bytes. In addition to the address tag, each cache tag directory entry contains 3 valid bits and 1 modified bit. Find the size of the cache tag directory

• 212 Kbits

• 320 Kbits

• 160 Kbits

• 120 Kbits

One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field?

• It can be used to prioritize packets

• It can be used to reduce delays

• It can be used to optimize throughput

• It can be used to prevent packet looping

Which of the following system calls results in the sending of SYN packets?

• socket

• connect

• listen

• bind

If a class B network on the Internet has a subnet mask of 255.255.248.0, what is the maximum number of hosts per subnet?

• 1022

• 2048

• 2045

• 2046

In classful addressing, an IP address 123.23.56.4 belongs to            format.

• Class A

• Class B

• Class C

• Class D

Count to infinity is a problem associated with

• Link state routing protocol.

• Distance vector routing protocol

• DNS while resolving host name

• TCP for congestion control

Which of the following is/are properties of distributed computing?

• Fault tolerance

• Resource sharing

• Load sharing

• None of the above

Which of the following is/are a type of Grid?

• Computational Grid

• Data Grid

• Edge Grid

• All of the above

“On demand cyber infrastructure” - is better identified with which of the following?

• Grid Computing

• Cluster Computing

• Utility Computing

• Both ‘a’ and ‘b’