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Computer Network Articles
Page 63 of 122
What is physical layer coding violation?
The Physical Layer Coding Violation is a framing technique used in data communication to identify frame boundaries by intentionally violating the normal encoding rules of the physical layer. This method leverages the redundancy built into certain encoding schemes to create distinct markers for frame delimitation. How It Works This technique is specifically used in networks where the physical medium encoding contains redundancy, such as in Manchester encoding. In Manchester coding, each data bit is represented by two physical bits, creating natural redundancy that can be exploited for framing purposes. Manchester Encoding and Coding ...
Read MoreHow to do Fuzzy Matching on Pandas Dataframe Column Using Python?
Fuzzy matching is a technique for finding approximate string matches in datasets where exact matches may not exist due to variations in spelling, formatting, or data entry errors. In pandas DataFrames, fuzzy matching helps identify similar entries across columns or datasets using similarity algorithms. The fuzzywuzzy library provides fuzzy string matching capabilities using Levenshtein distance to calculate similarity ratios between strings. We'll demonstrate matching car names between two DataFrames using a similarity threshold of 70%. Setting Up the Data First, let's create two DataFrames with similar but not identical car names: import pandas as pd ...
Read MoreWhat is traffic aware routing in computer networks?
Traffic-aware routing is a congestion control approach that dynamically adjusts routing decisions based on current network load conditions. Unlike traditional routing algorithms that only consider static metrics like hop count or bandwidth, traffic-aware routing incorporates real-time traffic information to make more intelligent path selection decisions. The main goal of traffic-aware routing is to identify the best routes by considering both static parameters (bandwidth, propagation delay) and dynamic factors (current load, queuing delay). By setting link weights as a function of these combined metrics, the algorithm can distribute traffic more evenly across the network. Traffic-Aware ...
Read MoreWhat is an admission control approach for congestion control?
An admission control approach is a proactive congestion control technique used primarily in virtual-circuit networks. It prevents network congestion by carefully evaluating whether new connections can be established without overloading the network resources. The fundamental principle is simple: do not set up a new virtual circuit unless the network can carry the added traffic without becoming congested. This approach acts as a gatekeeper, ensuring that only sustainable traffic loads are admitted into the network. Admission Control Process New Request ...
Read MoreWhat is Traffic Throttling in computer networks?
Traffic throttling is a congestion control mechanism used in computer networks where senders adjust their transmission rates to match the network's capacity. The goal is to operate the network just before congestion occurs, maximizing throughput while preventing packet loss and delays. Traffic throttling approaches can be implemented in both datagram and virtual-circuit networks. These mechanisms help maintain network stability by proactively managing data flow before congestion becomes severe. Each traffic throttling approach must solve two fundamental problems: Problem 1: Congestion Detection Routers must determine when congestion is approaching, ideally before it occurs. Each router continuously monitors ...
Read MoreWhat are transmission and propagation delay?
Network delay is defined as how much time it takes for data to travel from one node to another node in a network. Understanding network delay is crucial for optimizing network performance and predicting data transfer times. Network delay can be divided into the following components: Transmission delay − Time to push all packet bits onto the transmission medium Propagation delay − Time for bits to travel through the physical medium to reach the destination Transmission vs Propagation Delay Sender ...
Read MoreWhat is three-bit sliding window protocol?
Sliding window protocol is a transmission control protocol used for reliable data communication. Both sender and receiver maintain finite buffers to hold outgoing and incoming packets, with every packet requiring acknowledgment from the receiver. The sender maintains a timer for every packet sent, and any unacknowledged packet within a certain time is retransmitted. The sender can transmit a complete window of packets before receiving acknowledgment for the first packet, leading to higher transfer rates as multiple packets are sent without waiting for individual acknowledgments. The receiver advertises a window size that tells the sender how much data it ...
Read MoreWhat are the services provided by the Network Layer?
The Network Layer is the third layer in the OSI model of computer networking. It handles packet forwarding, routing through routers, and quality of service management. This layer acts as an intermediary between the transport layer and the data link layer, providing essential services for end-to-end communication across networks. Nature of the Service The transport layer at the host receives services from the network layer, but there's an important distinction: the transport layer resides in end hosts, while the network layer operates within the subnet. The subnet is a collection of routers containing only the bottom three OSI ...
Read MoreWhat is the concept of flow and error control and their differences?
Flow control and error control are two fundamental mechanisms in computer networks that ensure reliable data transmission between sender and receiver. While both are essential for maintaining data integrity during communication, they serve distinct purposes in network protocols. Error Control Error control is concerned with ensuring that all frames are delivered to the destination correctly and possibly in order. It focuses on detecting and correcting transmission errors that may occur due to noise, interference, or other factors in the communication channel. To ensure reliable delivery, error control requires three key components: Acknowledgement Reliable delivery is ...
Read MoreWhat is a static channel allocation in computer networks?
In wireless networks, a channel can be allocated between source and destination. The communication path consists of multiple routers connected in a peer-to-peer manner, and the entire channel encompasses these network elements. Channel allocation schemes determine how available bandwidth is distributed among users. Channel allocation is fundamental to network performance, as it directly affects how efficiently the available spectrum is utilized and how well the network can handle varying traffic demands. Types of Channel Allocation The different types of channel allocation schemes are as follows: Static channel allocation − Fixed allocation of bandwidth portions to ...
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