Computer Networks: A Beginner’s guide to Computer Networking

Blend physics, mathematics, and electrical signals to transfer information via analog and digital signals, encoding, encryption, multiplexing, modulation, sampling, PCM, and error control.

Explore guided media like copper cables and fiber optics alongside unguided media such as wifi, and compare electrical energy, shielding, and category rated cables from cat 1 to 6.

Explore how light energy travels through optical fiber, a cylindrical waveguide, enabling long-distance, high-bandwidth communication with single-mode and multimode designs and LEDs, laser diodes, and photodiodes.

Explore satellite transmission media, including low earth orbit, medium earth orbit, and geostationary satellites, and learn how selection criteria and propagation delay shape global communication.

Explore channel coding in computer networks, including forward error correction, automatic repeat request, block codes, convolutional codes, and CRC to protect data against interference, attenuation, and distortion.

Explore transmission modes and communication types in computer networks by comparing asynchronous, synchronous, and ISO Kronos timing, and distinguishing simplex, half duplex, and full duplex channels.

Learn how a low-energy message signal is combined with a high-frequency carrier to form modulated signals, covering analog modulation (amplitude, frequency, phase) and digital modulation techniques for binary data.

Explore how modems combine modulation and demodulation to connect computers over telephone lines, fiber, cable, and wireless networks, including dial up, dsl, cable, fiber, and mobile broadband.

Combine multiple signals into one channel and demultiplex at the receiver. Explore analog and digital multiplexing, including FDM, WDM, TDM, and CDMA.

Examine internet access technologies from narrowband to broadband, including dial-up, ISDN, DSL, cable, HFC, optical fiber, and wireless, and how local loop connections link subscribers to providers.

Compare circuit switching, which reserves a dedicated path, with packet switching, where data travels as packets; explore local, metropolitan, and wide area networks, wifi connectivity, and switches.

Explore physical and logical network topology, including point-to-point, bus, star, tree, and mesh designs, with discussions on extended, distributor, hybrid, and fully or partially connected configurations.

Examine channelization in computer networks, outlining fdma, tdma, and cdma for allocating frequency and time, and compare polling, token passing, and random access protocols with csma/cd and csma/ca.

Explain wired technology in computer networks, detailing Ethernet frames, MAC addresses (6 bytes, 48 bits), destination and source addresses, ethertype, payload limits, preamble, CRC, and Ethernet cabling and hubs.

Explore wireless technology for personal area networks, covering Bluetooth, Zigbee, and RFID standards, short-range, low-power connections, and single-user device networking.

Explore wireless LAN and MAN concepts, including spread spectrum techniques such as direct sequence and frequency hopping, OFDM, and 802.11 standards, plus architectures with access points and wireless hosts.

Explore wireless technology across cellular and satellite systems, tracing 1G to 4G evolution with GSM, 2G/2.5G, CDMA, 3G, LTE Advanced, plus GPS timing and satellite ground stations.

Explore how interconnected physical networks form the internet, understand internet architecture with routers, and compare intranets and the internet, plus address types: MAC physical vs IP logical.

Explore IPv4 basics: 32-bit addresses in four octets, binary and dotted decimal notation, and classful addressing across five classes that separates networks from hosts.

Learn how IP addresses are allocated by IANA and regional registries via ISPs, and how subnet masks and CIDR enable classless routing, subnetting, and efficient address use.

Explore IPv6, the next generation internet protocol that provides 128-bit addresses and faster routing. Learn its hexadecimal, colon-separated notation and the roles of unicast and multicast communication.

Explain the IP packet structure, detailing the header and payload with fields like version, header length, total length, identification, flags, fragment offset, time to live, protocol, and addresses. Fragmentation concepts.

Explore the internet protocol basics, including ERP, ERP flooding and ERP spoofing, and how ERP cache maps IP addresses to MAC addresses, with broadcast requests and address resolution dynamics.

Learn how ICMP, DHCP, IPv6 neighbor discovery, and NAT enable network diagnostics, address configuration, and secure private-to-public address translation for internet access.

Explain TCP as a reliable, connection-oriented protocol with ordered delivery and header fields, and outline UDP as a simple, connectionless, best-effort protocol with its header.

Explore the transport layer protocol, including 16-bit port numbers (well-known, registered, dynamic/private), and compare connection-oriented tcp with connectionless udp, highlighting the three-way handshake, reliability, sequencing, and flow control.

Explore internet routing concepts from static routes to dynamic routing and default routes, comparing manual configuration, automatic updates, and when each approach best fits small versus large networks.

Explore how dynamic routing protocols automatically adapt routes within autonomous systems, including IGP and EGP such as BGP, and cover distance-vector, link-state, and hybrid routing approaches.

Explore distance vector routing protocols within autonomous systems, and how interior gateway protocols and border gateway protocols exchange routing information to optimize paths and handle bandwidth considerations.

Explore link-state routing within a single autonomous system, detailing ISIS, LSP/LSU packets, and area hierarchies, alongside the hybrid diffusion update approach in EIGRP.

Explore multicast routing concepts, including group membership via IGMP and MLD, using a single multicast IP address, and routing approaches like DVMRP, CBT, and PIM in various modes.

Explore network performance metrics including latency, delay, and throughput, and understand quality of service concepts, QoS mechanisms, SLA, and techniques like RSVP, COPS, diffserv, and MPLS.

Explore how network attacks threaten confidentiality, integrity, and availability, covering denial-of-service, malware such as viruses, worms, and Trojan horses, spoofing, phishing, session hijacking, zero-day attacks, insider threats, sniffing, and scanning.

Explore network security policies and techniques that protect data with integrity, confidentiality, and availability, using hashing, encryption, digital signatures, certificates, firewalls, IDS, and IPsec.

Learn how the network manager plans, installs, operates, and monitors heterogeneous networks while applying SNMP and MIB-based management through agents and a centralized console.