Cisco CCNA SeriesNew part

CCNA 200-301

Lab-tested Cisco IOS configuration for the CCNA 200-301 exam: device setup, CLI, SSH, and LAN services.

Start with Part 1 → 61 parts · 6 hr 44 min total · read in order
CCNA 200-301
  1. 1 CCNA 200-301 Study Guide and Roadmap Part 1 of 61

    CCNA 200-301 Study Guide and Roadmap

    The CCNA 200-301 is a single exam that certifies you can install, configure, and troubleshoot a small enterprise network, and this study guide breaks down exactly…

    14 min read·Jun 2026
  2. 2 CCNA Salary: Is the CCNA Worth It in 2026? Part 2 of 61

    CCNA Salary: Is the CCNA Worth It in 2026?

    Is the CCNA worth it? For most people aiming at a networking career, yes, but the salary figures online range from about $70,000 to $130,000 for…

    5 min read·Jun 2026
  3. 3 CCNA vs CompTIA Network+: Which to Take First? Part 3 of 61

    CCNA vs CompTIA Network+: Which to Take First?

    You are choosing your first networking certification, and it usually comes down to two: the Cisco CCNA and CompTIA Network+. They cover overlapping ground, so it…

    4 min read·Jun 2026
  4. 4 CCNA 200-301 Exam Cost, Format, and Passing Score Part 4 of 61

    CCNA 200-301 Exam Cost, Format, and Passing Score

    The CCNA is a single exam: 200-301, 120 minutes, 300 US dollars. One exam earns the certification, with no separate parts since Cisco consolidated the old…

    4 min read·Jun 2026
  5. 5 CCNA Exam Question Types and Sim Strategy Part 5 of 61

    CCNA Exam Question Types and Sim Strategy

    The CCNA punishes one habit harder than any other: assuming you can come back to a question later. You cannot. The exam is forward-only, so the…

    5 min read·Jun 2026
  6. 6 CCNA 200-301 Retake Policy: Rules After You Fail or Pass Part 6 of 61

    CCNA 200-301 Retake Policy: Rules After You Fail or Pass

    Fail the CCNA and you wait five days before you can retake it. Pass it and you cannot retake the same exam for 180 days. Those…

    3 min read·Jun 2026
  7. 7 OSI Model Explained: 7 Layers, TCP/IP Mapping & Encapsulation Part 7 of 61

    OSI Model Explained: 7 Layers, TCP/IP Mapping & Encapsulation

    Two models describe how a network moves data: the seven-layer OSI model and the TCP/IP model that the Internet actually runs on. Layers are referred to…

    8 min read·Jun 2026
  8. 8 TCP vs UDP Explained: Handshake, Windowing, and Ports Part 8 of 61

    TCP vs UDP Explained: Handshake, Windowing, and Ports

    TCP and UDP are the two transport protocols that carry almost all network traffic, and the choice between them is a trade-off, not a ranking. TCP…

    7 min read·Jun 2026
  9. 9 Network Devices Explained: Routers, Switches, Firewalls, and APs Part 9 of 61

    Network Devices Explained: Routers, Switches, Firewalls, and APs

    Every network you have ever used is built from a small set of device types, and each one has exactly one job it is good at.…

    10 min read·Jun 2026
  10. 10 Network Architectures Explained: Campus, Spine-Leaf, WAN Part 10 of 61

    Network Architectures Explained: Campus, Spine-Leaf, WAN

    Before you can design a network, you have to know which shape it should take, and that shape depends almost entirely on scale and on the…

    8 min read·Jun 2026
  11. 11 Copper vs Fiber Network Cabling: Types, Distances, Connectors Part 11 of 61

    Copper vs Fiber Network Cabling: Types, Distances, Connectors

    Every cable in a network is one of two things: copper or glass. Copper twisted pair is cheap, easy to terminate, and runs to almost every…

    6 min read·Jun 2026
  12. 12 Power over Ethernet (PoE) Explained: Standards and Wattage Part 12 of 61

    Power over Ethernet (PoE) Explained: Standards and Wattage

    A Power over Ethernet switch sends both data and electricity down the same cable. That one fact is why a wireless access point on a ceiling,…

    6 min read·Jun 2026
  13. 13 How Switches Work: MAC Learning, Flooding, and the MAC Table Part 13 of 61

    How Switches Work: MAC Learning, Flooding, and the MAC Table

    A switch with an empty MAC address table behaves like a hub: the first frame it ever sees gets copied out every port. Seconds later it…

    8 min read·Jun 2026
  14. 14 Wireless Networking Fundamentals: Channels, SSID, Security Part 14 of 61

    Wireless Networking Fundamentals: Channels, SSID, Security

    Three things decide how a Wi-Fi network behaves: the radio band it transmits on, the name it advertises, and the encryption that protects it. Get those…

    11 min read·Jun 2026
  15. 15 Virtualization Fundamentals: VMs, Containers, and VRFs Part 15 of 61

    Virtualization Fundamentals: VMs, Containers, and VRFs

    Virtualization runs many isolated systems on one piece of hardware. It shows up at three levels that the CCNA treats as one topic: the server (virtual…

    6 min read·Jun 2026
  16. 16 IPv4 Addressing Explained: Classes, Private IPs & Cisco Setup Part 16 of 61

    IPv4 Addressing Explained: Classes, Private IPs & Cisco Setup

    You sit down at a brand-new router, type show ip interface brief, and every line says unassigned. Before that box forwards a single packet it needs…

    8 min read·Jun 2026
  17. 17 How to Subnet: A Step-by-Step Guide to Subnetting by Network Requirements Part 17 of 61

    How to Subnet: A Step-by-Step Guide to Subnetting by Network Requirements

    Most people who struggle with the CCNA do not freeze on OSPF or VLANs. They freeze on a subnetting question with the clock running, because subnetting…

    8 min read·Jun 2026
  18. 18 VLSM Subnetting Explained: How to Subnet by Host Requirements Part 18 of 61

    VLSM Subnetting Explained: How to Subnet by Host Requirements

    Carving a network into equal-size subnets wastes addresses. A point-to-point link with two routers does not need the same block you hand a 60-user LAN, yet…

    5 min read·Jun 2026
  19. 19 Subnetting Cheat Sheet: IPv4 Masks, Hosts, and VLSM Part 19 of 61

    Subnetting Cheat Sheet: IPv4 Masks, Hosts, and VLSM

    Every IPv4 subnet mask, the usable host count it gives you, the wildcard mask, and the fastest way to work a subnet by hand. This subnetting…

    5 min read·Jun 2026
  20. 20 IPv6 Addressing Explained: Address Types and EUI-64 Part 20 of 61

    IPv6 Addressing Explained: Address Types and EUI-64

    IPv6 exists because the 32-bit IPv4 address space ran out: roughly 4.3 billion addresses was never going to cover the modern internet. IPv6 uses 128-bit addresses,…

    8 min read·Jun 2026
  21. 21 Verify IP Settings on Windows, macOS, and Linux Part 21 of 61

    Verify IP Settings on Windows, macOS, and Linux

    By the end of this you’ll know the exact command to confirm a machine’s IP address, subnet mask, default gateway, and DNS server on any of…

    6 min read·Jun 2026
  22. 22 Cisco IOS CLI Editing Commands and Navigation Shortcuts Part 22 of 61

    Cisco IOS CLI Editing Commands and Navigation Shortcuts

    Most of the time you spend on a Cisco router or switch is spent typing in the IOS command-line interface, and a handful of modes, shortcuts,…

    6 min read·Jun 2026
  23. 23 Cisco Device Base Configuration: Hostname, SSH, and Secure Access Part 23 of 61

    Cisco Device Base Configuration: Hostname, SSH, and Secure Access

    A factory-fresh Cisco router or switch trusts whoever reaches the console, answers to the generic name Router or Switch, and offers no way in over the…

    11 min read·Jun 2026
  24. 24 Configure SSH on Cisco Routers and Switches Part 24 of 61

    Configure SSH on Cisco Routers and Switches

    Telnet sends your username and enable password across the wire in cleartext. SSH does not, and on a Cisco router or switch it takes a short,…

    7 min read·Jun 2026
  25. 25 Troubleshoot Cisco Interfaces: show interfaces, Errors, Duplex Part 25 of 61

    Troubleshoot Cisco Interfaces: show interfaces, Errors, Duplex

    When a Cisco link misbehaves, the interface counters usually told you why long before anyone noticed the slowdown. A port stuck in notconnect, a CRC count…

    8 min read·Jun 2026
  26. 26 CCNA Command Cheat Sheet: Essential Cisco IOS Commands Part 26 of 61

    CCNA Command Cheat Sheet: Essential Cisco IOS Commands

    Every CCNA command you actually need, grouped the way you use them, on one page you can keep open while you lab. This is the reference…

    4 min read·Jun 2026
  27. 27 CCNA 200-301 Domain 1 Practice Test: Network Fundamentals Part 27 of 61

    CCNA 200-301 Domain 1 Practice Test: Network Fundamentals

    Domain 1, Network Fundamentals, is a 20 percent block of the CCNA 200-301 exam and the foundation the other five domains build on, so it is…

    3 min read·Jun 2026
  28. 28 How to Configure VLANs on a Cisco Switch Part 28 of 61

    How to Configure VLANs on a Cisco Switch

    By default, a switch puts every port in one big broadcast domain. Sales, Engineering, the printers, and the guest in the lobby all share the same…

    8 min read·Jun 2026
  29. 29 How to Configure 802.1Q Trunking on Cisco Switches Part 29 of 61

    How to Configure 802.1Q Trunking on Cisco Switches

    Configure an 802.1Q trunk between Cisco switches: tag VLANs, set the native VLAN, prune the allowed list, and verify with show interfaces trunk.

    9 min read·Jun 2026
  30. 30 CDP and LLDP Network Discovery on Cisco Switches Part 30 of 61

    CDP and LLDP Network Discovery on Cisco Switches

    Configure and read CDP and LLDP on Cisco switches: see what is on each port, run show cdp neighbors and show lldp neighbors, and compare the…

    8 min read·Jun 2026
  31. 31 Configure Spanning Tree Protocol (Rapid PVST+) on Cisco Switches Part 31 of 61

    Configure Spanning Tree Protocol (Rapid PVST+) on Cisco Switches

    Configure Spanning Tree (Rapid PVST+) on Cisco switches: elect the root bridge, read port roles and states, and set PortFast and BPDU Guard.

    7 min read·Jun 2026
  32. 32 Configure EtherChannel (LACP) on Cisco Switches Part 32 of 61

    Configure EtherChannel (LACP) on Cisco Switches

    Configure EtherChannel on Cisco switches with LACP: bundle two links into one Port-channel, verify with show etherchannel summary, and balance traffic.

    5 min read·Jun 2026
  33. 33 Cisco Wireless Architectures and AP Modes Explained Part 33 of 61

    Cisco Wireless Architectures and AP Modes Explained

    Understand Cisco wireless architectures and AP modes: autonomous vs controller-based, split-MAC and CAPWAP, FlexConnect, and the lightweight AP modes.

    6 min read·Jun 2026
  34. 34 CCNA 200-301 Domain 2 Practice Test: Network Access Part 34 of 61

    CCNA 200-301 Domain 2 Practice Test: Network Access

    Test your CCNA 200-301 Domain 2 (Network Access) knowledge: VLANs, trunking, CDP/LLDP, spanning tree, EtherChannel, and wireless, with explained answers.

    2 min read·Jun 2026
  35. 35 How to Read the Cisco IP Routing Table (show ip route) Part 35 of 61

    How to Read the Cisco IP Routing Table (show ip route)

    Read the Cisco IP routing table with show ip route: route codes, administrative distance vs metric, longest-prefix match, and the gateway of last resort.

    6 min read·Jun 2026
  36. 36 How a Cisco Router Forwards a Packet (CEF, FIB, and Adjacency) Part 36 of 61

    How a Cisco Router Forwards a Packet (CEF, FIB, and Adjacency)

    A packet arrives on one interface and leaves on another, and everything a router does happens in the microseconds between those two events. The routing table…

    7 min read·Jun 2026
  37. 37 Configure IPv4 Static Routes on Cisco (Default and Floating) Part 37 of 61

    Configure IPv4 Static Routes on Cisco (Default and Floating)

    When the primary link drops, a backup route has to take over, and on a Cisco router that backup is usually a floating static route. Static…

    6 min read·Jun 2026
  38. 38 Configure IPv6 Static Routes on Cisco (Link-Local & Floating) Part 38 of 61

    Configure IPv6 Static Routes on Cisco (Link-Local & Floating)

    IPv6 static routes look like their IPv4 cousins until you hit the parts that are genuinely different, and those parts are where marks get lost in…

    5 min read·Jun 2026
  39. 39 OSPF Concepts Explained for CCNA: DR/BDR and LSDB Part 39 of 61

    OSPF Concepts Explained for CCNA: DR/BDR and LSDB

    Every router running OSPF builds an identical map of the network and then works out its own best paths from that map. That single idea is…

    6 min read·Jun 2026
  40. 40 Configure Single-Area OSPF on Cisco IOS Part 40 of 61

    Configure Single-Area OSPF on Cisco IOS

    Static routes work fine until you have more than a few of them. Single-area OSPF is where most networks reach for a dynamic routing protocol: the…

    10 min read·Jun 2026
  41. 41 Configure Router-on-a-Stick Inter-VLAN Routing on Cisco Part 41 of 61

    Configure Router-on-a-Stick Inter-VLAN Routing on Cisco

    Put two computers in different VLANs on the same switch and they cannot reach each other. That is not a fault; it is the whole point…

    7 min read·Jun 2026
  42. 42 Configure Inter-VLAN Routing with a Layer 3 Switch (SVI) Part 42 of 61

    Configure Inter-VLAN Routing with a Layer 3 Switch (SVI)

    Router-on-a-stick gets inter-VLAN routing working, but it routes in software and squeezes every packet between VLANs through one trunk cable. A Layer 3 switch does the…

    6 min read·Jun 2026
  43. 43 First Hop Redundancy Protocol Explained: HSRP, VRRP, and GLBP Part 43 of 61

    First Hop Redundancy Protocol Explained: HSRP, VRRP, and GLBP

    Every device on a subnet sends off-network traffic to a single default gateway. That one address is also the network’s quietest single point of failure. When…

    7 min read·Jun 2026
  44. 44 Troubleshoot IP Connectivity on Cisco Routers Part 44 of 61

    Troubleshoot IP Connectivity on Cisco Routers

    PC1 cannot reach PC2. The ping times out, and a whole subnet of users is stuck on the LAN with no way off it. Two routers,…

    7 min read·Jun 2026
  45. 45 CCNA 200-301 Domain 3 Practice Test: IP Connectivity Part 45 of 61

    CCNA 200-301 Domain 3 Practice Test: IP Connectivity

    Free CCNA 200-301 Domain 3 (IP Connectivity) practice test: 30 random questions per retake from a 91-question lab-validated bank, with explanations.

    3 min read·Jun 2026
  46. 46 Network Security Concepts: Threats, Exploits, and Defenses Part 46 of 61

    Network Security Concepts: Threats, Exploits, and Defenses

    The network security concepts the CCNA tests: threats vs vulnerabilities vs exploits, the CIA triad, defense in depth, common attacks and mitigations, and security program elements.

    7 min read·Jun 2026
  47. 47 Configure Cisco Device Access Control with Local Passwords Part 47 of 61

    Configure Cisco Device Access Control with Local Passwords

    Configure and verify Cisco device access control with local passwords: enable secret, console and VTY lines, login local, the password types, and SSH.

    8 min read·Jun 2026
  48. 48 AAA Explained: RADIUS vs TACACS+ on Cisco Part 48 of 61

    AAA Explained: RADIUS vs TACACS+ on Cisco

    AAA explained and compared: authentication, authorization, accounting, and RADIUS vs TACACS+ ports, transport, and encryption, with Cisco AAA configuration.

    6 min read·Jun 2026
  49. 49 Configure Cisco Access Control Lists (ACLs) Part 49 of 61

    Configure Cisco Access Control Lists (ACLs)

    Configure and verify Cisco ACLs: standard, extended, and named access control lists, wildcard masks, placement, and show access-lists with real hit counters.

    6 min read·Jun 2026
  50. 50 Cisco Port Security: Configure Sticky MACs and Violations Part 50 of 61

    Cisco Port Security: Configure Sticky MACs and Violations

    A switch port with nothing plugged into it is still a live network jack. Anyone who can reach it, a visitor in a meeting room, a…

    7 min read·Jun 2026
  51. 51 Configure Cisco DHCP Snooping to Block Rogue Servers Part 51 of 61

    Configure Cisco DHCP Snooping to Block Rogue Servers

    When a PC boots, it trusts the first DHCP server that answers. It cannot tell the company’s real server from a cheap router someone plugged into…

    5 min read·Jun 2026
  52. 52 Configure Cisco Dynamic ARP Inspection (DAI) Part 52 of 61

    Configure Cisco Dynamic ARP Inspection (DAI)

    ARP has no way to verify that a reply is honest. A host asks “who has 192.168.10.1?” and believes whatever answer comes back first, so an…

    6 min read·Jun 2026
  53. 53 Remote Access vs Site-to-Site VPN Explained Part 53 of 61

    Remote Access vs Site-to-Site VPN Explained

    Two offices in different cities need to act like one network, and a worker at home needs to reach the servers back at the building. The…

    6 min read·Jun 2026
  54. 54 CCNA 200-301 Domain 5 Practice Test: Security Fundamentals Part 54 of 61

    CCNA 200-301 Domain 5 Practice Test: Security Fundamentals

    Security Fundamentals covers more separate skills than any other part of the Cisco CCNA 200-301 exam. It is a 15 percent block, but it spreads across…

    3 min read·Jun 2026
  55. 55 Configure HSRP on Cisco Routers Part 55 of 61

    Configure HSRP on Cisco Routers

    When the default gateway on a subnet dies, every host on it loses the path off the LAN until someone swaps hardware or reconfigures. HSRP removes…

    6 min read·Jun 2026
  56. 56 Configure DNS on Cisco Routers Part 56 of 61

    Configure DNS on Cisco Routers

    DNS turns names into addresses, so you can reach server1.lab.example.com without memorizing 10.0.0.1. A Cisco router handles names three ways: it can keep its own static…

    5 min read·Jun 2026
  57. 57 Configure NAT and PAT on a Cisco Router Part 57 of 61

    Configure NAT and PAT on a Cisco Router

    Every phone, laptop, and server on a private network needs to reach the internet, yet they all carry addresses the internet refuses to route. Network Address…

    8 min read·Jun 2026
  58. 58 Configure a Cisco DHCP Server and Relay Part 58 of 61

    Configure a Cisco DHCP Server and Relay

    A laptop that joins a network gets its IP address, subnet mask, default gateway, and DNS server in a couple of seconds, and nobody typed any…

    6 min read·Jun 2026
  59. 59 How to Configure NTP on Cisco IOS (Client and Server) Part 59 of 61

    How to Configure NTP on Cisco IOS (Client and Server)

    A router with the wrong clock will happily timestamp a log entry from 1993, reject a valid certificate as expired, and break a Kerberos login, all…

    8 min read·Jun 2026
  60. 60 How to Configure SNMP and Syslog on Cisco IOS Part 60 of 61

    How to Configure SNMP and Syslog on Cisco IOS

    When something breaks on a network at 3 a.m., the device already knew. It logged the interface going down, the neighbor it lost, the config someone…

    8 min read·Jun 2026
  61. 61 Quality of Service (QoS) Explained for CCNA Part 61 of 61

    Quality of Service (QoS) Explained for CCNA

    Bandwidth is finite, and when a link fills up, something has to wait. Quality of Service decides what waits and what goes first. On an uncongested…

    7 min read·Jun 2026

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