CompTIA Network+ Certification: The Complete Course

Learn essential network elements and how they connect devices, including hubs, NICs, MAC addresses, bridges, gateways, and firewalls. See how IP, DHCP, DNS, ISP, and modem operate to manage traffic.

Explore network topology concepts, including how multiple computers share resources in various physical layouts, from line-based connections to devices acting as clients in a peer-to-peer setup.

Explore physical topologies in networks, including point-to-point, bus, ring, star, and mesh, with advantages, disadvantages, installation costs, and how hubs and cabling shape reliable, secure, and fast connections.

Explore the OSI reference model and its layers that enable interoperable device communication, detailing segmentation, packets, sequencing, and protocols such as TCP, UDP, IP, and DNS.

Explain how the OSI model governs device-to-device transmission from physical signaling to application data, detailing layers, IP and MAC addressing, reliability concepts, and the model’s advantages and drawbacks.

Explore the tcp/ip protocol suite as the internet foundation, detailing ip addressing, mac addressing, and how the model maps to application, transport, network, and link layers for end-to-end delivery.

Explore tcp/ip protocols, including tcp, udp, icmp, and igmp, focusing on ports, sequence and acknowledgment numbers, checksums, and ip addressing for internet communication.

Explore tcp/ip applications such as DNS translating domain names to ip addresses, ip addressing basics, UDP usage, email exchange, and FTP, with SSH securing data.

Explore tcp/ip port numbers and their ranges—well-known 0–1023, registered 1024–49151, dynamic 49152–65535—with examples like ftp port 21 and dns port 53, and compare tcp/ip and osi models.

Learn how IP security protects data via integrity, authentication, and authorization, using hash functions, digital signatures, and PKI, plus access control models like DAC and RBAC with ACL.

Learn how encryption and non repudiation protect data using digital signatures and public key cryptography, including private and public keys, certificate authorities, and PKI policies.

Explore authentication methods securing network access, from CHAP and MS-CHAP to password-based logins, and AAA's authentication, authorization, and accounting, plus EAP standards for wireless and wired systems.

Discover how tcp/ip secure applications use ipsec to protect traffic and ssl to authenticate servers, exchange certificates, and create encrypted connections between clients and resources.

Explore the Ethernet specification and how Ethernet connects LAN devices using shared media, signals, collision detection, and collision domains to manage data transmission and network access.

Explore how the physical layer defines ethernet transmission media, covering copper and optical fiber, and how baseband signaling enables megabit to gigabit speeds.

Learn how ethernet operates at the data link layer, utilizing unique MAC addresses on NICs to frame data, identify vendors, and distinguish unicast frames for transmission.

Ethernet standards and features shape modern networks, from early Ethernet iterations in 1985 to gigabit Ethernet, fiber optic options, and cabling choices with security considerations.

Explore wired transmission media, including coaxial cables with jackets, bnc connectors, and rg-45, comparing shielded and unshielded options, cross-talk, electromagnetic interference, and bandwidth.

Explore optical fiber as a non-conducting light waveguide, compare single-mode and multimode fibers, and examine step-index and graded-index profiles for long-distance, high-bandwidth networks.

Explore transmission media and their properties, including how fiber cables resist noise, impact on signal quality, and bandwidth considerations for long vs short distance communications.

Explore wireless transmission media and electromagnetic radiation, from omnidirectional radio-frequency wireless devices to unidirectional microwaves and infrared, with applications in satellite, radar, weather, mobile networks, and medical imaging.

The lecture explains network addresses, including physical MAC addresses and logical IP addresses, and how IP classes A, B, and C divide networks into network IDs and host IDs.

Explore public versus private IP addresses, including static and dynamic ISP assignments, and how subnet masks define class a, b, and c ranges for network communication.

Learn how ERP maps IP addresses to MAC addresses, using broadcast requests and unicast replies to resolve the MAC for a given IP, enabling reliable packet delivery in networks.

Learn to calculate network and broadcast addresses by applying subnet masks to classful IPs, identify valid vs. invalid addresses, and determine host counts for class b and class c ranges.