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Gem Points For IBPS SO (Specialist Officer) – Part -12 - Computer Awareness Notes | Study Famous Books for UPSC Exam (Summary & Tests) - UPSC

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Gem Points For IBPS SO (Specialist Officer) – Part -12

Hello Aspirants,as we all know only few days are left for IBPS SO exam.So, we are starting a new series ” Gem points ” in this regard.learn them by heart.Share and discuss in comment section.We will gear up level day by day starting from very basics.So,Put your Seatbelts on and join us in the journey to be a specialist officer.

Computer Networks : Delays and Loss

1) Propagation delay
Queuing delay
Transmission delay are faced by the packet in travelling from one end system to another.

2) For a 10Mbps Ethernet link, if the length of the packet is 32bits, the transmission delay is(in milliseconds) is 3.2. Explanation: Transmission rate = length / transmission rate= 32/10 = 3.2milli seconds.

3) The time required to examine the packet’s header and determine where to direct the packet is part of Processing delay.

4) Traffic intensity is given by, where L = number of bits in the packet a = average rate R = transmission rate La/R.

5) In the transfer of file between server and client, if the transmission rates along the path is 10Mbps, 20Mbps, 30Mbps, 40Mbps. The throughput is usually 10Mbps.

Explanation: The throughput is generally the transmission rate of bottleneck link.

6) If end to end delay is given by dend-end = N(dproc + dtrans + dprop) is a non congested network. The number of routers between source and destination is N-1.

7) The total nodal delay is given by dnodal = dproc + dqueue + dtrans + dprop.

8) In a network, If P is the only packet being transmitted and there was no earlier transmission, Queuing delays could be zero.

9) Transmission delay does not depend on Distance between the routers.
Explanation: Transmission delay = packet length / transmission rate.

10) Propagation delay depends on Distance between the routers.
Explanation: Propagation delay is the time it takes a bit to propagate from one router to the next.

Network Attacks

1) The attackers a network of compromised devices known as Botnet.

2) Vulnerability attack
Bandwidth flooding
Connection flooding are form of DoS attack.

3) The DoS attack is which the attacker establishes a large number of half-open or fully open TCP connections at the target host :- Connection flooding.

4) The DoS attack is which the attacker sends deluge of packets to the targeted host :- Bandwidth flooding.

5) Packet sniffers involve Passive receiver.
Explanation: They do not inject packets into the channel.

6) Sniffers can be deployed in
Wired environment
WiFi
Ethernet LAN

7) Firewalls are often configured to block UDP traffic.

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