SYBCS: Computer Networks 1 : PYQ with Answers

 Chapter 3: Network Layer

1 mark
Q. Convert dotted decimal IP address to binary address 255.255.0.0

- To convert the dotted decimal IP address 255.255.0.0 to binary, we convert each decimal number to its binary representation:

255 in binary: 11111111
255 in binary: 11111111
0 in binary: 00000000
0 in binary: 00000000

Therefore, the binary representation of the IP address 255.255.0.0 is 11111111.11111111.00000000.00000000.

Q. What is the use of TTL field in IPv4.

-The TTL (Time To Live) field in IPv4 is a 8-bit field that indicates the maximum amount of time, measured in seconds or hops, that a packet can exist in a network. It is primarily used to control the lifespan of a packet and prevent it from circulating indefinitely in a network.

The TTL field is decremented by one by each router or network device that handles the packet. If the TTL field reaches zero, the packet is typically discarded.

Q. What is the size of IPv4 & IPv6 Address?

- The size of an IPv4 address is 32 bits or 4 bytes. It is commonly represented in dotted decimal notation, with four decimal numbers separated by periods (e.g., 192.168.0.1).

The size of an IPv6 address is 128 bits or 16 bytes. IPv6 addresses are typically represented in hexadecimal notation, using eight groups of four hexadecimal digits separated by colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334).

Q. Define routing.

- Routing refers to the process of selecting the optimal path or route for data packets to travel from a source to a destination in a computer network.Routers examine the destination IP address of a packet and use routing tables to determine the next hop or interface through which the packet should be forwarded. The routing tables contain information about the network topology, including network addresses and associated routes.

Q. What is address resolution?

- Address resolution, specifically in the context of networking, refers to the process of mapping higher-level network addresses, such as IP addresses, to lower-level addresses, such as MAC addresses.

Q. Identify the address type for the MAC address FF:FF:FF:FF:FF:FF

- The MAC address FF:FF:FF:FF:FF:FF is a special address known as the broadcast address. In Ethernet and other network technologies, a broadcast address is used to send a frame to all devices on a network. When a device sends a frame with the destination MAC address set to FF:FF:FF:FF:FF:FF, it is indicating that the frame should be delivered to all devices connected to the network.

Q. Define physical and logical address.

- Physical Address: A physical address, also known as a hardware address or MAC address, is a unique identifier assigned to a network interface card (NIC) or network adapter. It is a fixed address burned into the device during manufacturing and is used at the data link layer of the network stack. Physical addresses.Examples of physical addresses include MAC addresses in Ethernet networks.

Logical Address: A logical address, also known as a network address, is an address assigned to a device at the network layer of the network stack. It is used to identify a device within a network or subnetwork. The most common example of a logical address is the IP (Internet Protocol) address used in IP networks. Logical addresses are hierarchical and can be dynamically assigned or configured.

4 mark

Q.  Define attenuation, distortion and Noise

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Attenuation: Attenuation refers to the reduction in the strength or intensity of a signal as it travels through a medium or transmission system. It occurs due to factors such as resistance, impedance, and distance.

Distortion: Distortion refers to any alteration or deformation of a signal waveform during transmission or processing. It can occur due to various factors such as interference, noise, non-linearities in components, or limitations of the transmission medium.

Noise: Noise refers to any unwanted or random disturbances that interfere with the desired signal. It can be introduced by various sources such as electromagnetic interference, thermal noise, crosstalk, or environmental factors.

Q. Explain Host id and Net id of IP address classes.

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Q. For the given IP address 205.16.37.39/28 in some block of address, 

Calculate : i) Address Mask ii) First Address of block iii) Last address of block iv) Number of addresses in the block

Chapter 4: Transport Layer

1 mark

Q.  Define Multiplexing and Demultiplexing.

-Q. What is Port address?

4 mark

Q.Explain Multiplexing & De_multiplexing in transport Layer.

Q. Write a note on UDP.

Q. What are the services provided by user agent?

Q.  Draw and explain UDP datagram.

Q. Explain TCP features.

Q.What is channelization? List the methods of channelization. Explain any one method

Q. What is channelization ? List three channelization methods and explain any one method

Q. Define contention system

Q.  State the difference between Reservation and Polling.

Q. Explain active web document.

Q. What is firewall? Explain packet firewall.

Q. Explain the packet switching with advantages and disadvantages.

Q. Explain RARP. What are its advantages and disadvantages

Q. Explain 10Base5, 10Base2, 10Base-T, 10Base-F

Q. Explain dynamic and static address mapping in ARP

Q.  Explain syntax of URL.

Q. Draw the frame format of PPP.

Q. What is Piggybacking ?

-Q. Write a short note on Microwave Transmission

-Q. State the applications of coaxial cable.

Q.  Explain coaxial cable and give its applications, advantages and disadvantages.

Q. Draw the frame format of PPP.

-Q.  State the connectors used with fiber optic cables.

Q. Explain fiber optic cable with their types and applications.

Q. Explain the characteristics of line coding.

Q. What is the purpose of line testing tool ?

Q. Define Bridge. List the types of Bridges and explain any one type in detail

Q.  What is flow control ? Why is it needed ?