1. Which one of the following is not a search engine?
2. Which of the following cannot be used as a public IP address?
3. In the diagram shown below. L1 is an Ethernet LAN and L2 is a Token-Ring LAN.An IP packet originates from sender S and traverses to R, as shown. The link withineach ISP, and across two ISPs, are all point to point optical links. The initial value of TTL is 32. The maximum possible value of TTL field when R receives the datagram is-
4. Which protocol is used to send an "unknown destination" message back to the originating host?
5. Which statement is FALSE regarding a bridge?
6. Which device forwards data based on MAC addresses?
7. Suppose you want to download text documents at the rate of 100 pages per second. Assume that a page consists of an average of 24 lines with 80 characters in each line. What is the required bit rate of the channel?
8. Which of the following is not a valid IP address?
9. Distance vector routing algorithm is a dynamic routing algorithm. The routing tables in distance vector routing algorithm are updated ___.
10. Which of the following regular expressions represents the set of all the binary strings with an odd number of 1’s?
11. Suppose, 10 users are plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10 Mbps half-duplex as well. How much bandwidth does each host have to the server?
12. What is the frequency range of the IEEE 802.11a standard?
13. Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s.
14. Which of the following describes a router’s functions?
15. Consider a 50 Mbps satellite channel with a 500 milliseconds round trip propagation delay. If the sender wants to transmit 1000 bit frames, how much time will it take for the receiver to receive the frame?
16. Count to infinity is a problem associated with
17. In a class B subnet, we know the IP address of one host and the mask as given below:
IP address: 125.134.112.66
Mask: 255.255.224.0
19. The combination of an IP address and a port number is known as __________.
20. The address resolution protocol (ARP) is used for-
21. A receiving host has failed to receive all of the segments that it should acknowledge what can the host do to improve the reliability of this communication session?
22. Assume that Source S and Destination D are connected through an intermediate router R. How many times a packet has to visit the network layer and data link layer during a transmission from S to D?
23. In the IPv4 addressing format, the number of networks allowed under Class C addresses is –
24. What is the split horizon?
25. What is routing poisoning?
26. What is a Computer Virus?
27. Suppose that a class A is defined with two variables name1, name2 and three methods with arguments int f1(int), void f2(String) and String f3(String, int). Then choose which one of the following cannot be asked in a class B which is extended from A?
28. What is the purpose of flow control?
29. Which one of the following has the truth value FALSE for the variables A=TRUE and B=TRUE and C=TRUE?
30. Which layer 1 devices can be used to enlarge the area covered by a single LAN segment?
31. Which initial program is called at the starting of a computer?
32. What is the correct output of the following C program statements?
int array[] = {6, 7, 8, 9, 0, 1, 2, 4, 5, 6}, *p = array + 5;
printf("%d\n", *p);
33. Suppose you need to assign IPv4 addresses to two computers of your company so that the both computers belong to the subnet 255.255.255.240. Which of the following is a valid assignment?
34. Consider the following relational data table, Employee. Now, find the output for the following SQL Statement?
SELECT COUNT (*) FROM Employee, Employee, Employee
35. What is the characteristic of OOP programming that allows binding data and methods to work as a unit?
36. Which of the following uses the flip-flop circuit in a memory cell?
37. Which of the logic expressions is equivalent to the digital circuit shown in the figure?
38. Laili digitally signs a message and sends it to Mojnu. Verification of the signature by Mojnu requires-
39. Network 10.20.30.0 was assigned to the ITGod company to connect its ISP. The administrator of ITGod would like to configure one router with commands to access the internet. Which commands could be configured on the Gateway Router to allow internet access to the center network?
40. Classless Inter Domain Routing (CIDR) receives a packet with address 131.23.151.76. The routers routing table has the following entries
41. An attacker sits between the sender and receiver and captures the information and retransmits to the receiver after some time without altering the information. This attack is called as __________.
