Question

1.List 3 differences between Packet Switching and Circuit Switching

2.Briefly explain HOL Blocking

3.List 3 differences between TCP Tahoe and TCP Reno

Answer 1

Q1.List 3 differences between Packet Switching and Circuit Switching
Answer:------

1. Circuit Switching is connection oriented that means a path is established between source and destination before the transmission occurs while Packet Switching is Connectionless that means a dynamic route is decided for each packet while transmission.
2. Circuit Switching was originally designed for voice communication whereas, Packet Switching was originally designed for data communication.
3. Circuit Switching is inflexible as once a path is established for transmission, it doesn’t change while the duration of the session while Packet Switching is flexible as each packet may travel through a different route to reach its destination.

Q2.Briefly explain HOL Blocking
Answer:------
Head-of-line blocking (HOL blocking) in networking is a performance issue that occurs when a bunch of packets is blocked by the first packet in line. It can happen specially in input buffered network switches where out-of-order delivery of packets can occur. A switch can be composed of input buffered ports, output buffered ports and switch fabric.

Q3.List 3 differences between TCP Tahoe and TCP Reno
Answer:------

1. TCP Tahoe is the original version of TCP congestion avoidance while TCP Reno is equal to TCP Tahoe plus.TCP Reno retains the basic principle of Tahoe, such as slow starts and the coarse grain re-transmit timer.
2. TCP Tahoe will reset the congestion window to 1 MSS or 1 Packet after 3 duplicate ACKs are detected by the sender. Reno will reset the congestion window to 1/2 of the previous window.
3. TCP Reno is more quickly recover from loss than TCP Tahoe.