BCS052-SOLVED ASSIGNMENT 2016-17 IGNOU BCA5th SEM

1.

(a)

Why flow control is used at both Data-Link layer and Transport Layer of OSI model? Also, compare the working of Sliding Window protocol of Data-Link layer and Transport layer.

(b)

Explain the various HTTP request methods using an example of each.

(c)

How a domain name is mapped to its equivalent network address? Explain using an example.

(d)

Suppose the class B network uses 20 out of 32 bits to define a network address. How many Class B Network are possible in this case?

2.

(a)

List and describe all elementary socket systems calls and data transfer calls.

(b)

Write a connection-oriented client and server algorithm (using socket system calls) where client program interact with the Server as given below: A client machine begins by sending a request to calculate a factorial of a number; the server sends back a confirmation of the service (if server is having any method for calculating factorial) to the respective client.

If Server confirmation is positive, client sends a number and server replies as the factorial of that number to the client.

3.

(a)

Compare the security features, reliability approaches and delivery mechanisms of IPv4 and IPv6.

(b)

Why do LANs tend to use broadcast networks? Why not use networks consisting of multiplexers and switches.

(c)

Identify the Address Class of the following IP addresses:

(a) 255.255.190.0

(b) 216.111.52.12

(c) 150.156.10.10

(d) 92.2.1.1

(d)

Why would an application use UDP instead of TCP? Also, explain how can TCP handle urgent data?

4.

(a)

Assume you are chief network administrator of a company. This company is having its offices in different cities. Each office is having more than 50 machines and a server. These servers and network of all offices are further controlled and managed by the main server. Discuss the security issues and threats in such network. Make a chart to explain the available solutions for each issue/threat.

(b)

Describe the activities to be performed at every layer in the TCP/IP model when information flows from layer to another layer.

(c)

The size of the option field of an IP diagram is 20 bytes. What is the value of HLEN field in binary?

(d)

Write short notes on following: (i) ICMP. (ii) IP Encapsulation (iii) Sockets. (iv) SNMP.

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