Network

Watch the presentation Se presentationen på svenska A network is an interconnected system of devices designed to facilitate communication, data exchange, and resource sharing. Networks play a critical role in IT infrastructure, supporting everything from basic file sharing to the operation of complex distributed applications and services. Core Functions of a Network A network connects multiple devices, called nodes, to allow for seamless data transmission. This data travels in packets, which are routed to their destination through network devices. »

Watch the presentation Se presentationen på svenska In networking, the smooth flow of data between devices relies on fundamental components such as IP addresses, CIDR ranges, subnets, and Network Interface Cards (NICs). Understanding how these elements work together is essential for managing networks effectively, whether in a local environment or the cloud. What Are IP Addresses? An IP address (Internet Protocol address) is a unique identifier assigned to each device on a network, enabling it to send and receive data accurately. »

Watch the presentation Se presentationen på svenska This article explores how private networks create secure, internal communication environments using non-routable IP addresses, while public networks facilitate global connectivity with public IPs. Understanding the unique characteristics, benefits, and challenges of each network type provides valuable insight into their use cases and how they connect with the wider internet. What Are Private Networks? Private networks are used for internal communication within an organization or a defined environment, such as a home, office, or data center. »

What are IP Addresses? Unique identifiers for devices in a network. Types of IP Addresses IPv4: 32-bit addresses (e.g., 192.168.1.1); widely used. Limited address space; NAT often required. IPv6: 128-bit addresses (e.g., 2001:0db8:85a3::8a2e:0370:7334); designed for scalability. Vast address space CIDR (Classless Inter-Domain Routing) CIDR simplifies IP address allocation by grouping addresses. Represented as IP/Prefix, where Prefix indicates the subnet size. Example: 192.168.1.0/24 represents 256 addresses. Example: 192.168.1.1/32 represents 1 addresses. Example: 0. »

Vad är IP-adresser? Unikt ID för noder i ett nätverk. Typer av IP-adresser IPv4: 32-bitarsadresser (t.ex. 192.168.1.1); vanligast. Begränsat antal; NAT krävs ofta. IPv6: 128-bitarsadresser (t.ex. 2001:0db8:85a3::8a2e:0370:7334); skalbarhet. Enormt antal adresser. CIDR (Classless Inter-Domain Routing) CIDR förenklar tilldelning av IP-adresser genom att gruppera adresser. Representeras som IP/Prefix, där Prefix anger subnätets storlek. Exempel: 192.168.1.0/24 (256 adresser) Exempel: 192.168.1.1/32 (1 adress) Exempel: 0.0.0.0/0 (alla adresser) Subnät med CIDR Delar IP-intervall i mindre nätverk. »

Privata och Publika Nätverk Nätverk kategoriseras som privata eller publika baserat på deras åtkomstmöjligheter. Vad är ett Privat Nätverk? Konceptet “non-routable” IP-adresser. Används ofta i företags- och hemnätverk. Exempel: 192.168.0.0/16, 10.0.0.0/8, 172.16.0.0/12 (RFC 1918-intervall). NAT (Network Address Translation): Översätter privata IP till publika IP för internetaccess. Vad är ett Publikt Nätverk? Tillgängligt för alla enheter med internetåtkomst. Routbara globalt Exempel: Publika IP-adresser som tilldelas av internetleverantörer, t.ex. 8.8.8.8 (Google DNS). »

Private and Public Networks Networks are categorized as private or public based on their accessibility. This distinction plays a key role in networking and security design. What is a Private Network? The concept of non-routable IP addresses Often used in organizational or home environments. Example: 192.168.0.0/16, 10.0.0.0/8, 172.16.0.0/12 (RFC 1918 ranges). What is a Public Network? Accessible to any device with internet access. Used for global communication and resource sharing. Example: Public IPs assigned by ISPs, like 8. »

Vad är ett nätverk? Möjliggör kommunikation mellan enheter (noder) i ett nätverk. Överför data via routing (mellan nätverk) och switching (inom nätverk). Säkerställer att data överförs korrekt och säkert med olika protokoll (t.ex. TCP/IP, HTTP). Implementerar säkerhet med brandväggar, kryptering och åtkomstkontroller för att skydda data. Nyckelkomponenter i ett nätverk Routrar: Dirigerar data mellan nätverk; använder IP-adresser. Switchar: Hanterar data inom lokala nätverk; använder MAC-adresser. Brandväggar: Kontrollerar trafik med hjälp av säkerhetsregler. »

What is a Network? Connectivity: Enables communication paths between devices and networks. Data Transmission: Transfers data using routing (inter-network) and switching (intra-network). Protocols: Ensure data is transmitted correctly and securely (e.g., TCP/IP, HTTP). Security: Implements firewalls, encryption, and access controls to protect data. Key Network Components Routers: Direct data between networks; use IP addresses to forward packets. Switches: Manage data within local networks based on MAC addresses. Firewalls: Monitor and control traffic using security rules. »