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Category Archives: Computer Networks

What is Forwarding? Forwarding is moving incoming packets to the appropriate interface. Routers use a forwarding table to decide which incoming packet should be forwarded to… Read More
What are Unicasting, Anycasting, Multicasting and Broadcasting? If the message is sent from a source to a single destination node, it is called Unicasting. This… Read More
Circuit Switching Packet Switching In-circuit switching has there are 3 phases: i) Connection Establishment. ii) Data Transfer. iii) Connection Released. In Packet switching directly data transfer takes place.… Read More
Which of the following is public IP address ? (A) 10.15.14.12 (B) 192.168.52.62 (C) 172.32.1.1 (D) None of the Above Answer: (C) Explanation: Range of… Read More
If subnet mask 255.255.255.224, which of the following will be Direct Broadcast address ? (A) 202.15.19.127 (B) 202.15.19.63 (C) Both a and b (D) None… Read More
DNS is an application layer protocol. All application layer protocols use one of the two transport layer protocols, UDP and TCP. TCP is reliable and… Read More
  1. Repeater – A repeater operates at the physical layer. Its job is to regenerate the signal over the same network before the signal… Read More
We have introduced IP addressing and classful addressing in the previous post.   Network Address and Mask Network address – It identifies a network on… Read More
IP address is an address having information about how to reach a specific host, especially outside the LAN. An IP address is a 32 bit… Read More
Why IPv4 Datagram Fragmentation required? Different Networks may have different maximum transmission unit (MTU), for example due to differences in LAN technology. When one network… Read More
The network layer is the third layer (from bottom) in the OSI Model. The network layer is concerned with the delivery of a packet across… Read More
Following questions have been asked in GATE CS 2009 exam.  1) Let G(x) be the generator polynomial used for CRC checking. What is the condition… Read More
Following questions have been asked in GATE CS 2006 exam. 1) Station A uses 32 byte packets to transmit messages to Station B using a… Read More
Following questions have been asked in GATE CS 2007 exam.  1) The address of a class B host is to be split into subnets with… Read More
Following questions have been asked in GATE CS 2007 exam.  1) Which one of the following uses UDP as the transport protocol? (A) HTTP (B) Telnet (C) DNS (D)… Read More

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