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MCA Articles
Page 56 of 95
What are IPV6 Unicast Addresses in computer networks?
Internet Protocol version 6 (IPv6) allows data transfer to take place over networks with improved efficiency, performance, and security compared to IPv4. Most importantly, it enables service providers to reduce the size of their routing tables while providing a vastly expanded address space. Representation of IPv6 IPv6 consists of 128 bits represented by eight groups of hexadecimal digits, with each group containing 16 bits separated by colons. Example of IPv6 Address 2002:0db6:65a3:0000:0000:6a2e:0270:7443 IPv6 Address Types Unicast One-to-one ...
Read MoreWhat is UDP Datagram Format in computer networks?
The User Datagram Protocol (UDP) is a transport layer protocol defined for use with the IP network layer protocol. UDP provides a connectionless, unreliable datagram service that prioritizes speed and simplicity over guaranteed delivery. UDP Datagram Format The UDP datagram has an 8-byte header followed by the data payload. This compact header structure contributes to UDP's efficiency and low overhead. UDP Datagram Format Source Port (16 bits) Dest Port (16 bits) Length (16 bits) ...
Read MoreWhat are the Stream Control Transmission Protocol (SCTP) services?
The Stream Control Transmission Protocol (SCTP) is a transport layer protocol designed to address the limitations of TCP and UDP for modern Internet applications. Operating at the same layer as TCP and UDP, SCTP provides reliable, message-oriented communication with advanced features like multihoming and multistreaming. SCTP was specifically developed for applications that require more sophisticated services than TCP can provide, including telephony signaling protocols (IUA, M2UA, M3UA), media gateway control (H.248), and IP telephony applications (H.323, SIP). SCTP Protocol Stack Position Application Layer ...
Read MoreWhat is RPC Implementation?
Remote Procedure Call (RPC) is a protocol that allows a program running on one computer to execute procedures or functions on another computer across a network. The calling program doesn't need to understand the underlying network details, making remote operations appear as local function calls. RPC abstracts the complexity of network communication, enabling distributed applications to interact seamlessly across different systems and networks. Applications of RPC RPC is widely used in various systems and applications: Active Directory service − Windows uses RPC for domain authentication and directory services. MMC terminals − Microsoft ...
Read MoreWhat is a Domain Name System?
The Domain Name System (DNS) is a hierarchical and decentralized naming system that translates human-readable domain names into machine-readable IP addresses. It serves as the internet's phonebook, enabling users to access websites using memorable names like www.example.com instead of complex numeric addresses like 192.168.1.1. DNS operates using the User Datagram Protocol (UDP) on port 53 and relies on a distributed network of DNS servers to resolve domain names efficiently across the global internet. How DNS Works When you type a domain name into your browser, DNS performs the following translation process: Step 1 − Your browser ...
Read MoreDifferentiate between domain and domain name server and components of DNS
The main difference between domain and domain name server (DNS) is that a domain is a unique identification string that helps identify a specific website, while DNS (Domain Name System) is a distributed system that translates domain names to their corresponding IP addresses to deliver the requested webpage. There are millions of websites on the World Wide Web including educational, e-commerce, government, and entertainment sites. Each website must have its own unique domain name to identify it on the internet. When a user enters a domain name in their browser, the DNS converts that name to the matching IP ...
Read MoreWhat is a DNS Name Resolution and explain the cache poisoning attack in DNS?
The Domain Name System (DNS) is a fundamental internet service that translates human-readable domain names into IP addresses. DNS name resolution is the process by which this translation occurs, enabling users to access websites using memorable names instead of numerical IP addresses. How DNS Name Resolution Works When a program needs to translate a domain name into an IP address, it contacts a DNS server to perform the resolution. However, this process rarely occurs at a single DNS server. Instead, the initial DNS server recursively queries other DNS servers in a hierarchical manner to complete the translation. ...
Read MoreWhat is Authentication Header (AH) format?
Authentication Header (AH) is a security protocol used in IPSec to provide data integrity, authentication, and replay protection to IP datagrams. The services are connectionless, meaning they work on a per-packet basis without maintaining connection state. AH operates in two modes: transport mode (protecting payload only) and tunnel mode (protecting the entire original IP packet). However, AH cannot protect certain IP header fields that change during transit, called mutable fields. Mutable IPv4 Fields The following IPv4 header fields are considered mutable and are not protected by AH: Type of Service (TOS) − Can be modified ...
Read MoreWhat is ESP in tunnel and transport mode and the difference between AH and ESP?
Encapsulating Security Payload (ESP) is one of the two main protocols in IPSec that provides encryption, authentication, and integrity services for IP packets. ESP protects the data payload through encryption while ensuring data integrity and authenticity using cryptographic algorithms. ESP operates in two distinct modes: transport mode for host-to-host communication and tunnel mode for network-to-network communication. The choice of mode determines which parts of the IP packet are protected and how the packet structure is modified. ESP in Transport Mode In transport mode, the ESP header is inserted directly after the original IP header, and the ESP ...
Read MoreDifferentiate between 4G and 5G cellular Networks
A cellular network is a fundamental technology for mobile phones, personal communication systems, and wireless networking. The technology uses lower power transmitters with shorter range coverage areas called cells, enabling efficient spectrum reuse and supporting millions of simultaneous users across a geographic region. Both 4G and 5G represent major evolutionary steps in cellular technology, each offering distinct capabilities and addressing different communication needs. Understanding their differences helps in appreciating the technological advancement and choosing the right network for specific applications. 4G vs 5G Cellular Networks 4G ...
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